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source: palm/trunk/UTIL/agent_preprocessing/agent_preprocessing.f90 @ 3346

Last change on this file since 3346 was 3259, checked in by sward, 6 years ago
Updated agent preprocessing to avoid gfortran warnings
Property svn:keywords set to `Id`
File size: 116.1 KB

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1	!> @agent_preprocessing.f90
2	!------------------------------------------------------------------------------!
3	! This file is part of the PALM model system.
4	!
5	! PALM is free software: you can redistribute it and/or modify it under the
6	! terms of the GNU General Public License as published by the Free Software
7	! Foundation, either version 3 of the License, or (at your option) any later
8	! version.
9	!
10	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
11	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
12	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
13	!
14	! You should have received a copy of the GNU General Public License along with
15	! PALM. If not, see <http://www.gnu.org/licenses/>.
16	!
17	! Copyright 1997-2018 Leibniz Universitaet Hannover
18	!------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! ------------------
22	!
23	!
24	! Former revisions:
25	! -----------------!
26	! $Id: agent_preprocessing.f90 3259 2018-09-18 09:53:18Z raasch $
27	! Removed unused variables and fixed real to real comparisons
28	!
29	! 3216 2018-08-29 10:22:12Z sward
30	! Bubfix for gfortran: reordering of type definitions
31	!
32	! 3210 2018-08-28 07:31:13Z sward
33	! Bugfix: changed intrinsic SIZEOF to STORAGE_SIZE
34	!
35	! 3208 2018-08-27 13:10:50Z sward
36	! Renamed nav_mesh to agent_preprocessing, adapted terminal output
37	!
38	! 3198 2018-08-15 09:23:10Z sward
39	! Reduced tolerance_dp to 3 entries, fixed its initialization
40	!
41	! 3168 2018-07-25 06:40:29Z sward
42	! Updated NetCDF ororgraphy and building input
43	!
44	! Initial revision
45	!
46	!
47	! Description:
48	! ------------
49	!> Reads topography and building data and converts this information into a
50	!> navigation mesh (NavMesh, a visibility graph). This mesh is necessary for
51	!> the use of the Multi Agent System in PALM for the agents to navigate in
52	!> complex (urban) terrain.
53	!------------------------------------------------------------------------------!
54
55	MODULE kinds
56
57	IMPLICIT NONE
58
59	!
60	!-- Floating point kinds
61	INTEGER, PARAMETER :: sp = 4 !< single precision (32 bit)
62	INTEGER, PARAMETER :: dp = 8 !< double precision (64 bit)
63
64	!
65	!-- Integer kinds
66	INTEGER, PARAMETER :: isp = SELECTED_INT_KIND( 9 ) !< single precision (32 bit)
67	INTEGER, PARAMETER :: idp = SELECTED_INT_KIND( 14 ) !< double precision (64 bit)
68
69	!
70	!-- Set kinds to be used as defaults
71	INTEGER, PARAMETER :: wp = dp !< default real kind
72	INTEGER, PARAMETER :: iwp = isp !< default integer kind
73
74	SAVE
75
76	END MODULE kinds
77
78	MODULE variables
79
80	USE kinds
81
82	CHARACTER(LEN=3) :: char_lod = 'lod' !< name of level-of-detail attribute in NetCDF file
83	CHARACTER(LEN=10) :: char_fill = '_FillValue' !< name of fill value attribute in NetCDF file
84	CHARACTER(LEN=128) :: runname !< Run name
85
86	LOGICAL :: internal_buildings = .FALSE. !< Flag that indicates whether buildings within closed courtyards should be deleted
87	LOGICAL :: flag_2d = .FALSE. !< Flag that indicates that 2d buildings will be used in all cases
88
89	INTEGER(iwp) :: i !< Index along x
90	INTEGER(iwp) :: j !< Index along y
91	INTEGER(iwp) :: nx = 99999 !< Number of grid points in x-direction
92	INTEGER(iwp) :: ny = 99999 !< Number of grid points in x-direction
93	INTEGER(iwp) :: nov !< Number of vertices
94	INTEGER(iwp) :: polygon_counter !< Iterator for the number of building polygons
95	INTEGER(iwp) :: number_of_connections = 0 !< Counter for number of connections in mesh
96	INTEGER(iwp) :: i_cn !< Min number of corners left in polygons after Douglas Poiker algorithm
97	INTEGER(iwp) :: i_sc !< Cycle number for Douglas-Peucker algorithm
98	INTEGER(iwp) :: nc_stat !< return value of nf90 function call
99	INTEGER(iwp) :: vertex_counter !< Counter: total number of vertices
100
101	INTEGER, DIMENSION(:,:), ALLOCATABLE :: wall_flags_0 !< Bit-array containing surface information
102	INTEGER, DIMENSION(:,:), ALLOCATABLE :: polygon_id !< Identifies each grid point as part of exactly one building
103
104	REAL(wp) :: ddx !< inverse of dx
105	REAL(wp) :: ddy !< inverse of dy
106	REAL(wp) :: dx = 99999.9_wp !< grid spacing in x-direction
107	REAL(wp) :: dy = 99999.9_wp !< grid spacing in x-direction
108	REAL(wp) :: dz = 99999.9_wp !< grid spacing in x-direction
109	REAL(wp) :: finish !< variable for CPU time measurement
110	REAL(wp) :: start !< variable for CPU time measurement
111
112	REAL(wp), DIMENSION(0:2) :: tolerance_dp = 999999.0_wp !< tolerance in Douglas-Peucker algorithm
113
114	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: obstacle_height !< height of obstacles
115
116	!
117	!-- Define data structure where the dimension and type of the input depends
118	!-- on the given level of detail.
119	!-- For buildings, the input is either 2D float, or 3d byte.
120	TYPE build_in
121	INTEGER(iwp) :: lod = 1 !< level of detail
122	INTEGER(KIND=1) :: fill2 = -127 !< fill value for lod = 2
123	INTEGER(iwp) :: nz !< number of vertical layers in file
124	INTEGER(KIND=1), DIMENSION(:,:,:), ALLOCATABLE :: var_3d !< 3d variable (lod = 2)
125	REAL(wp), DIMENSION(:), ALLOCATABLE :: z !< vertical coordinate for 3D building, used for consistency check
126	LOGICAL :: from_file = .FALSE. !< flag indicating whether an input variable is available and read from file or default values are used
127	REAL(wp) :: fill1 = -9999.9_wp !< fill values for lod = 1
128	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: var_2d !< 2d variable (lod = 1)
129	END TYPE build_in
130
131	!
132	!-- Topography grid point
133	TYPE grid_point
134	LOGICAL :: checked !< Flag to indicate whether this grid point has been evaluated already
135	INTEGER(iwp) :: i !< x-index
136	INTEGER(iwp) :: j !< y-index
137	INTEGER(iwp) :: polygon_id !< ID of the polygon this grid point belongs to
138	END TYPE grid_point
139
140	!
141	!-- Node in the visibility graph navigation mesh
142	TYPE mesh_point
143	INTEGER(iwp) :: polygon_id !< Polygon the point belongs to
144	INTEGER(iwp) :: vertex_id !< Vertex in the polygon
145	INTEGER(iwp) :: noc !< number of connections
146	INTEGER(iwp) :: origin_id !< ID of previous mesh point on path (A*)
147	REAL(wp) :: cost_so_far !< Cost to reach this mesh point (A*)
148	REAL(wp) :: x !< x-coordinate
149	REAL(wp) :: y !< y-coordinate
150	REAL(wp) :: x_s !< corner shifted outward from building by 1m (x)
151	REAL(wp) :: y_s !< corner shifted outward from building by 1m (y)
152	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: connected_vertices !< Index of connected vertices
153	REAL(wp), DIMENSION(:), ALLOCATABLE :: distance_to_vertex !< Distance to each vertex
154	END TYPE mesh_point
155
156	!
157	!-- Vertex of a polygon
158	TYPE vertex_type
159	LOGICAL :: delete !< Flag to mark vertex for deletion
160	REAL(wp) :: x !< x-coordinate
161	REAL(wp) :: y !< y-coordinate
162	END TYPE vertex_type
163
164	!
165	!-- Polygon containing a number of vertices
166	TYPE polygon_type
167	INTEGER(iwp) :: nov !< Number of vertices in this polygon
168	TYPE(vertex_type), DIMENSION(:), ALLOCATABLE :: vertices !< Array of vertices
169	END TYPE polygon_type
170
171	!
172	!-- Define data type to read 2D real variables
173	TYPE real_2d
174	LOGICAL :: from_file = .FALSE. !< flag indicating whether an input variable is available and read from file or default values are used
175	REAL(wp) :: fill = -9999.9_wp !< fill value
176	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: var !< respective variable
177	END TYPE real_2d
178
179	!
180	!-- Define data type to read 2D real variables
181	TYPE real_3d
182	LOGICAL :: from_file = .FALSE. !< flag indicating whether an input variable is available and read from file or default values are used
183	INTEGER(iwp) :: nz !< number of grid points along vertical dimension
184	REAL(wp) :: fill = -9999.9_wp !< fill value
185	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: var !< respective variable
186	END TYPE real_3d
187
188	TYPE(grid_point), DIMENSION(:,:), ALLOCATABLE :: grid !< 2d Topography grid
189
190	TYPE(mesh_point), DIMENSION(:), ALLOCATABLE, TARGET :: mesh !< Navigation mesh
191
192	TYPE(real_2d) :: terrain_height_f !< input variable for terrain height
193
194	TYPE(vertex_type) :: dummy_vertex !< placeholder vertex used for data copying
195	TYPE(vertex_type) :: null_vertex !< placeholder vertex used for initialisation
196
197	TYPE(vertex_type), DIMENSION(:), ALLOCATABLE :: dummy_v_list !< Dummy for reallocation of polygon array
198
199	TYPE(polygon_type), POINTER :: polygon !< Current polygon
200
201	TYPE(polygon_type), DIMENSION(:), ALLOCATABLE, TARGET :: polygons !< Building polygons
202
203	TYPE(build_in) :: buildings_f !< input variable for buildings
204
205
206	END MODULE variables
207
208	MODULE data_input
209
210	USE kinds
211	USE variables
212
213	#if defined ( __netcdf )
214	USE NETCDF
215	#endif
216
217	INTERFACE get_variable
218	MODULE PROCEDURE get_variable_1d_int
219	MODULE PROCEDURE get_variable_1d_real
220	MODULE PROCEDURE get_variable_2d_int8
221	MODULE PROCEDURE get_variable_2d_int32
222	MODULE PROCEDURE get_variable_2d_real
223	MODULE PROCEDURE get_variable_3d_int8
224	MODULE PROCEDURE get_variable_3d_real
225	MODULE PROCEDURE get_variable_4d_real
226	END INTERFACE get_variable
227
228	INTERFACE get_attribute
229	MODULE PROCEDURE get_attribute_real
230	MODULE PROCEDURE get_attribute_int8
231	MODULE PROCEDURE get_attribute_int32
232	MODULE PROCEDURE get_attribute_string
233	END INTERFACE get_attribute
234
235	CONTAINS
236
237	!------------------------------------------------------------------------------!
238	! Description:
239	! ------------
240	!> Reads orography and building information.
241	!------------------------------------------------------------------------------!
242	SUBROUTINE netcdf_data_input_topo ( input_trunk )
243
244	IMPLICIT NONE
245
246	CHARACTER(LEN=*) :: input_trunk !< run path
247	CHARACTER(LEN=200) :: input_filename !< filename
248
249	CHARACTER(LEN=100), DIMENSION(:), ALLOCATABLE :: var_names !< variable names in static input file
250
251
252	INTEGER(iwp) :: i !< running index along x-direction
253	INTEGER(iwp) :: k_head !< minimum k index for agents to walk underneath overhanging buildings
254	INTEGER(iwp) :: id_topo !< NetCDF id of topograhy input file
255	INTEGER(iwp) :: j !< running index along y-direction
256	INTEGER(iwp) :: num_vars !< number of variables in netcdf input file
257
258	LOGICAL :: netcdf_flag = .FALSE. !< indicates whether netcdf file is used for input
259	LOGICAL :: lod_flag = .FALSE. !< true if 3d building data is used
260	LOGICAL :: topo_file_flag = .FALSE. !< true if 3d building data is used
261
262	WRITE(*,'((X,A,/))') 'Looking for topography/building information'
263	INQUIRE( FILE = TRIM( input_trunk )//'_static', EXIST = netcdf_flag )
264
265	IF ( netcdf_flag ) THEN
266	input_filename = TRIM( input_trunk )//'_static'
267	WRITE(*,'(2(3X,A,/))') 'Topography/building data will be used from', &
268	TRIM( input_trunk )//'_static'
269	ELSE
270	WRITE(*,'(2(3X,A,/))') 'No static driver was found.', &
271	'Trying to read building data from _topo file.'
272	input_filename = TRIM( input_trunk )//'_topo'
273	INQUIRE( FILE = TRIM( input_filename ), EXIST = topo_file_flag )
274	IF ( .NOT. topo_file_flag ) THEN
275	WRITE(*,'(6(3X,A,/))') &
276	'No ASCII topography file was found in INPUT directory.', &
277	'Make sure you provided building data in the form of either', &
278	' (A) a static driver (<runname>_static) or', &
279	' (B) an ASCII topography file (<runname>_topo).', &
280	NEW_LINE('A')//'Aborting nav_mesh program...'
281	STOP
282	ENDIF
283	WRITE(*,'(2(3X,A,/))') 'Topography/building data will be used from', &
284	TRIM( input_trunk )//'_topo'
285	ENDIF
286
287	!
288	!-- Input via palm-input data standard
289	IF ( netcdf_flag ) THEN
290	#if defined ( __netcdf )
291	!
292	!-- Open file in read-only mode
293	CALL open_read_file( TRIM(input_filename) , id_topo )
294
295	!
296	!-- At first, inquire all variable names.
297	!-- This will be used to check whether an input variable exist or not.
298	nc_stat = NF90_INQUIRE( id_topo, NVARIABLES = num_vars )
299	CALL handle_error( 'inquire_num_variables', 534 )
300	!
301	!-- Allocate memory to store variable names and inquire them.
302	ALLOCATE( var_names(1:num_vars) )
303	CALL inquire_variable_names( id_topo, var_names )
304	!
305	!-- Terrain height. First, get variable-related _FillValue attribute
306	IF ( check_existence( var_names, 'zt' ) ) THEN
307	terrain_height_f%from_file = .TRUE.
308	CALL get_attribute( id_topo, char_fill, &
309	terrain_height_f%fill, &
310	.FALSE., 'zt' )
311	!
312	!-- PE-wise reading of 2D terrain height.
313	ALLOCATE ( terrain_height_f%var(0:ny,0:nx) )
314	DO i = 0, nx
315	CALL get_variable( id_topo, 'zt', &
316	i, terrain_height_f%var(:,i) )
317	ENDDO
318	ELSE
319	terrain_height_f%from_file = .FALSE.
320	ENDIF
321
322	!
323	!-- Read building height. First, read its _FillValue attribute,
324	!-- as well as lod attribute
325	buildings_f%from_file = .FALSE.
326	IF ( check_existence( var_names, 'buildings_2d' ) ) THEN
327	buildings_f%from_file = .TRUE.
328	CALL get_attribute( id_topo, char_lod, buildings_f%lod, &
329	.FALSE., 'buildings_2d' )
330
331	CALL get_attribute( id_topo, char_fill, &
332	buildings_f%fill1, &
333	.FALSE., 'buildings_2d' )
334
335	!
336	!-- Read 2D topography
337	IF ( buildings_f%lod == 1 ) THEN
338	ALLOCATE ( buildings_f%var_2d(0:ny,0:nx) )
339	DO i = 0, nx
340	CALL get_variable( id_topo, 'buildings_2d', &
341	i, buildings_f%var_2d(:,i) )
342	ENDDO
343	ELSE
344	WRITE(*,'(A)') 'NetCDF attribute lod ' // &
345	'(level of detail) is not set properly.'
346	ENDIF
347	ENDIF
348	!
349	!-- If available, also read 3D building information. If both are
350	!-- available, use 3D information. Do this only if the flag that indicates
351	!-- that 2d buildings shall be used no matter what is false.
352	IF ( check_existence( var_names, 'buildings_3d' ) &
353	.AND. .NOT. flag_2d ) &
354	THEN
355	lod_flag = .TRUE.
356	buildings_f%from_file = .TRUE.
357	CALL get_attribute( id_topo, char_lod, buildings_f%lod, &
358	.FALSE., 'buildings_3d' )
359
360	CALL get_attribute( id_topo, char_fill, &
361	buildings_f%fill2, &
362	.FALSE., 'buildings_3d' )
363
364	CALL get_dimension_length( id_topo, buildings_f%nz, 'z' )
365
366	IF ( buildings_f%lod == 2 ) THEN
367	ALLOCATE( buildings_f%z(0:buildings_f%nz-1) )
368	CALL get_variable( id_topo, 'z', buildings_f%z )
369
370	ALLOCATE( buildings_f%var_3d(0:buildings_f%nz-1, &
371	0:ny,0:nx) )
372	buildings_f%var_3d = 0
373	!
374	!-- Read data PE-wise. Read yz-slices.
375	DO i = 0, nx
376	DO j = 0, ny
377	CALL get_variable( id_topo, 'buildings_3d', &
378	i, j, &
379	buildings_f%var_3d(:,j,i) )
380	ENDDO
381	ENDDO
382	ELSE
383	WRITE(*,'(A)') 'NetCDF attribute lod ' // &
384	'(level of detail) is not set properly.'
385	ENDIF
386	ENDIF
387
388	!
389	!-- Close topography input file
390	CALL close_input_file( id_topo )
391	#endif
392	!
393	!-- ASCII input
394	ELSE
395
396	OPEN( 90, FILE= input_filename, &
397	STATUS='OLD', FORM='FORMATTED' )
398	!
399	!-- Read data from nyn to nys and nxl to nxr. Therefore, skip
400	!-- column until nxl-1 is reached
401	ALLOCATE ( buildings_f%var_2d(0:ny,0:nx) )
402	DO j = ny, 0, -1
403	READ( 90, *, ERR=11, END=11 ) &
404	( buildings_f%var_2d(j,i), i = 0, nx )
405	ENDDO
406
407	GOTO 12
408
409	11 WRITE(*,'(2A)') 'errors in file ',input_filename
410
411	12 CLOSE( 90 )
412	buildings_f%from_file = .TRUE.
413
414	ENDIF
415	!
416	!-- In case no terrain height is provided by static input file, allocate
417	!-- array nevertheless and set terrain height to 0, which simplifies
418	!-- topography initialization.
419	IF ( .NOT. terrain_height_f%from_file ) THEN
420	ALLOCATE ( terrain_height_f%var(0:ny,0:nx) )
421	terrain_height_f%var = 0.0_wp
422	ENDIF
423
424	!
425	!-- Transfer read data to uniform format: For agents the only relevant
426	!-- information is whether they can walk or not at ground level.
427	k_head = CEILING(2./dz)
428	IF ( buildings_f%from_file ) THEN
429	IF ( lod_flag ) THEN
430	obstacle_height(0:nx,0:ny) = 1.
431	DO j = 0, ny
432	DO i = 0, nx
433	!
434	!-- For this purpose, an overhanging structure that an angent
435	!-- can walk beneath (e.g. a doorway) is not considered an
436	!-- obstacle.
437	IF ( ALL( buildings_f%var_3d(0:k_head,j,i) == 0 ) ) THEN
438	obstacle_height(i,j) = 0.
439	ENDIF
440	ENDDO
441	ENDDO
442	ELSE
443	DO j = 0, ny
444	DO i = 0, nx
445	obstacle_height(i,j) = buildings_f%var_2d(j,i)
446	ENDDO
447	ENDDO
448	ENDIF
449	ELSE
450	WRITE(,) 'No building data was read from file. There will be no' //&
451	'navigation data available to agents.'
452	ENDIF
453
454	END SUBROUTINE netcdf_data_input_topo
455
456	!------------------------------------------------------------------------------!
457	! Description:
458	! ------------
459	!> Checks if a given variables is on file
460	!------------------------------------------------------------------------------!
461	FUNCTION check_existence( vars_in_file, var_name )
462
463	IMPLICIT NONE
464
465	CHARACTER(LEN=*) :: var_name !< variable to be checked
466	CHARACTER(LEN=*), DIMENSION(:) :: vars_in_file !< list of variables in file
467
468	INTEGER(iwp) :: i !< loop variable
469
470	LOGICAL :: check_existence !< flag indicating whether a variable exist or not - actual return value
471
472	i = 1
473	check_existence = .FALSE.
474	DO WHILE ( i <= SIZE( vars_in_file ) )
475	check_existence = TRIM( vars_in_file(i) ) == TRIM( var_name ) .OR. &
476	check_existence
477	i = i + 1
478	ENDDO
479
480	RETURN
481
482	END FUNCTION check_existence
483
484
485	!------------------------------------------------------------------------------!
486	! Description:
487	! ------------
488	!> Closes an existing netCDF file.
489	!------------------------------------------------------------------------------!
490	SUBROUTINE close_input_file( id )
491	#if defined( __netcdf )
492
493	IMPLICIT NONE
494
495	INTEGER(iwp), INTENT(INOUT) :: id !< file id
496
497	nc_stat = NF90_CLOSE( id )
498	CALL handle_error( 'close', 537 )
499	#endif
500	END SUBROUTINE close_input_file
501
502	!------------------------------------------------------------------------------!
503	! Description:
504	! ------------
505	!> Opens an existing netCDF file for reading only and returns its id.
506	!------------------------------------------------------------------------------!
507	SUBROUTINE open_read_file( filename, id )
508	#if defined( __netcdf )
509
510	IMPLICIT NONE
511
512	CHARACTER (LEN=*), INTENT(IN) :: filename !< filename
513	INTEGER(iwp), INTENT(INOUT) :: id !< file id
514
515	nc_stat = NF90_OPEN( filename, NF90_NOWRITE, id )
516
517	CALL handle_error( 'open_read_file', 536 )
518
519	#endif
520	END SUBROUTINE open_read_file
521
522
523
524	!------------------------------------------------------------------------------!
525	! Description:
526	! ------------
527	!> Get dimension array for a given dimension
528	!------------------------------------------------------------------------------!
529	SUBROUTINE get_dimension_length( id, dim_len, variable_name )
530	#if defined( __netcdf )
531
532	IMPLICIT NONE
533
534	CHARACTER(LEN=*) :: variable_name !< dimension name
535	CHARACTER(LEN=100) :: dum !< dummy variable to receive return character
536
537	INTEGER(iwp) :: dim_len !< dimension size
538	INTEGER(iwp), INTENT(IN) :: id !< file id
539	INTEGER(iwp) :: id_dim !< dimension id
540
541	!
542	!-- First, inquire dimension ID
543	nc_stat = NF90_INQ_DIMID( id, TRIM( variable_name ), id_dim )
544	CALL handle_error( 'get_dimension_length', 526 )
545	!
546	!-- Inquire dimension length
547	nc_stat = NF90_INQUIRE_DIMENSION( id, id_dim, dum, LEN = dim_len )
548	CALL handle_error( 'get_dimension_length', 526 )
549
550	#endif
551	END SUBROUTINE get_dimension_length
552
553	!------------------------------------------------------------------------------!
554	! Description:
555	! ------------
556	!> Reads a 1D integer variable from file.
557	!------------------------------------------------------------------------------!
558	SUBROUTINE get_variable_1d_int( id, variable_name, var )
559
560	IMPLICIT NONE
561
562	CHARACTER(LEN=*) :: variable_name !< variable name
563
564	INTEGER(iwp), INTENT(IN) :: id !< file id
565	INTEGER(iwp) :: id_var !< dimension id
566
567	INTEGER(iwp), DIMENSION(:), INTENT(INOUT) :: var !< variable to be read
568	#if defined( __netcdf )
569
570	!
571	!-- First, inquire variable ID
572	nc_stat = NF90_INQ_VARID( id, TRIM( variable_name ), id_var )
573	CALL handle_error( 'get_variable_1d_int', 527 )
574	!
575	!-- Inquire dimension length
576	nc_stat = NF90_GET_VAR( id, id_var, var )
577	CALL handle_error( 'get_variable_1d_int', 527 )
578
579	#endif
580	END SUBROUTINE get_variable_1d_int
581
582	!------------------------------------------------------------------------------!
583	! Description:
584	! ------------
585	!> Reads a 1D float variable from file.
586	!------------------------------------------------------------------------------!
587	SUBROUTINE get_variable_1d_real( id, variable_name, var )
588
589	IMPLICIT NONE
590
591	CHARACTER(LEN=*) :: variable_name !< variable name
592
593	INTEGER(iwp), INTENT(IN) :: id !< file id
594	INTEGER(iwp) :: id_var !< dimension id
595
596	REAL(wp), DIMENSION(:), INTENT(INOUT) :: var !< variable to be read
597	#if defined( __netcdf )
598
599	!
600	!-- First, inquire variable ID
601	nc_stat = NF90_INQ_VARID( id, TRIM( variable_name ), id_var )
602	CALL handle_error( 'get_variable_1d_real', 527 )
603	!
604	!-- Inquire dimension length
605	nc_stat = NF90_GET_VAR( id, id_var, var )
606	CALL handle_error( 'get_variable_1d_real', 527 )
607
608	#endif
609	END SUBROUTINE get_variable_1d_real
610
611	!------------------------------------------------------------------------------!
612	! Description:
613	! ------------
614	!> Reads a 2D REAL variable from a file. Reading is done processor-wise,
615	!> i.e. each core reads its own domain in slices along x.
616	!------------------------------------------------------------------------------!
617	SUBROUTINE get_variable_2d_real( id, variable_name, i, var )
618
619	IMPLICIT NONE
620
621	CHARACTER(LEN=*) :: variable_name !< variable name
622
623	INTEGER(iwp), INTENT(IN) :: i !< index along x direction
624	INTEGER(iwp), INTENT(IN) :: id !< file id
625	INTEGER(iwp) :: id_var !< variable id
626
627	REAL(wp), DIMENSION(0:ny), INTENT(INOUT) :: var !< variable to be read
628	#if defined( __netcdf )
629	!
630	!-- Inquire variable id
631	nc_stat = NF90_INQ_VARID( id, TRIM( variable_name ), id_var )
632	!
633	!-- Get variable
634	nc_stat = NF90_GET_VAR( id, id_var, var(0:ny), &
635	start = (/ i+1, 1 /), &
636	count = (/ 1, ny + 1 /) )
637
638	CALL handle_error( 'get_variable_2d_real', 528 )
639	#endif
640	END SUBROUTINE get_variable_2d_real
641
642	!------------------------------------------------------------------------------!
643	! Description:
644	! ------------
645	!> Reads a 2D 32-bit INTEGER variable from file. Reading is done processor-wise,
646	!> i.e. each core reads its own domain in slices along x.
647	!------------------------------------------------------------------------------!
648	SUBROUTINE get_variable_2d_int32( id, variable_name, i, var )
649
650	IMPLICIT NONE
651
652	CHARACTER(LEN=*) :: variable_name !< variable name
653
654	INTEGER(iwp), INTENT(IN) :: i !< index along x direction
655	INTEGER(iwp), INTENT(IN) :: id !< file id
656	INTEGER(iwp) :: id_var !< variable id
657	INTEGER(iwp), DIMENSION(0:ny), INTENT(INOUT) :: var !< variable to be read
658	#if defined( __netcdf )
659	!
660	!-- Inquire variable id
661	nc_stat = NF90_INQ_VARID( id, TRIM( variable_name ), id_var )
662	!
663	!-- Get variable
664	nc_stat = NF90_GET_VAR( id, id_var, var(0:ny), &
665	start = (/ i+1, 1 /), &
666	count = (/ 1, ny + 1 /) )
667
668	CALL handle_error( 'get_variable_2d_int32', 529 )
669	#endif
670	END SUBROUTINE get_variable_2d_int32
671
672	!------------------------------------------------------------------------------!
673	! Description:
674	! ------------
675	!> Reads a 2D 8-bit INTEGER variable from file. Reading is done processor-wise,
676	!> i.e. each core reads its own domain in slices along x.
677	!------------------------------------------------------------------------------!
678	SUBROUTINE get_variable_2d_int8( id, variable_name, i, var )
679
680	IMPLICIT NONE
681
682	CHARACTER(LEN=*) :: variable_name !< variable name
683
684	INTEGER(iwp), INTENT(IN) :: i !< index along x direction
685	INTEGER(iwp), INTENT(IN) :: id !< file id
686	INTEGER(iwp) :: id_var !< variable id
687	INTEGER(KIND=1), DIMENSION(0:ny), INTENT(INOUT) :: var !< variable to be read
688	#if defined( __netcdf )
689	!
690	!-- Inquire variable id
691	nc_stat = NF90_INQ_VARID( id, TRIM( variable_name ), id_var )
692	!
693	!-- Get variable
694	nc_stat = NF90_GET_VAR( id, id_var, var(0:ny), &
695	start = (/ i+1, 1 /), &
696	count = (/ 1, ny + 1 /) )
697
698	CALL handle_error( 'get_variable_2d_int8', 530 )
699	#endif
700	END SUBROUTINE get_variable_2d_int8
701
702	!------------------------------------------------------------------------------!
703	! Description:
704	! ------------
705	!> Reads a 3D 8-bit INTEGER variable from file.
706	!------------------------------------------------------------------------------!
707	SUBROUTINE get_variable_3d_int8( id, variable_name, i, j, var )
708
709	IMPLICIT NONE
710
711	CHARACTER(LEN=*) :: variable_name !< variable name
712
713	INTEGER(iwp), INTENT(IN) :: i !< index along x direction
714	INTEGER(iwp), INTENT(IN) :: id !< file id
715	INTEGER(iwp) :: id_var !< variable id
716	INTEGER(iwp), INTENT(IN) :: j !< index along y direction
717	INTEGER(iwp) :: n_file !< number of data-points along 3rd dimension
718
719	INTEGER(iwp), DIMENSION(1:3) :: id_dim
720
721	INTEGER( KIND = 1 ), DIMENSION(0:buildings_f%nz-1), INTENT(INOUT) :: var !< variable to be read
722	#if defined( __netcdf )
723
724	!
725	!-- Inquire variable id
726	nc_stat = NF90_INQ_VARID( id, TRIM( variable_name ), id_var )
727	!
728	!-- Get length of first dimension, required for the count parameter.
729	!-- Therefore, first inquired dimension ids
730	nc_stat = NF90_INQUIRE_VARIABLE( id, id_var, DIMIDS = id_dim )
731	nc_stat = NF90_INQUIRE_DIMENSION( id, id_dim(3), LEN = n_file )
732	!
733	!-- Get variable
734	nc_stat = NF90_GET_VAR( id, id_var, var, &
735	start = (/ i+1, j+1, 1 /), &
736	count = (/ 1, 1, n_file /) )
737
738	CALL handle_error( 'get_variable_3d_int8', 531 )
739	#endif
740	END SUBROUTINE get_variable_3d_int8
741
742
743	!------------------------------------------------------------------------------!
744	! Description:
745	! ------------
746	!> Reads a 3D float variable from file.
747	!------------------------------------------------------------------------------!
748	SUBROUTINE get_variable_3d_real( id, variable_name, i, j, var )
749
750	IMPLICIT NONE
751
752	CHARACTER(LEN=*) :: variable_name !< variable name
753
754	INTEGER(iwp), INTENT(IN) :: i !< index along x direction
755	INTEGER(iwp), INTENT(IN) :: id !< file id
756	INTEGER(iwp) :: id_var !< variable id
757	INTEGER(iwp), INTENT(IN) :: j !< index along y direction
758	INTEGER(iwp) :: n3 !< number of data-points along 3rd dimension
759
760	INTEGER(iwp), DIMENSION(3) :: id_dim
761
762	REAL(wp), DIMENSION(:), INTENT(INOUT) :: var !< variable to be read
763	#if defined( __netcdf )
764
765	!
766	!-- Inquire variable id
767	nc_stat = NF90_INQ_VARID( id, TRIM( variable_name ), id_var )
768	!
769	!-- Get length of first dimension, required for the count parameter.
770	!-- Therefore, first inquired dimension ids
771	nc_stat = NF90_INQUIRE_VARIABLE( id, id_var, DIMIDS = id_dim )
772	nc_stat = NF90_INQUIRE_DIMENSION( id, id_dim(3), LEN = n3 )
773	!
774	!-- Get variable
775	nc_stat = NF90_GET_VAR( id, id_var, var, &
776	start = (/ i+1, j+1, 1 /), &
777	count = (/ 1, 1, n3 /) )
778
779	CALL handle_error( 'get_variable_3d_real', 532 )
780	#endif
781	END SUBROUTINE get_variable_3d_real
782
783
784	!------------------------------------------------------------------------------!
785	! Description:
786	! ------------
787	!> Reads a 4D float variable from file. Note, in constrast to 3D versions,
788	!> dimensions are already inquired and passed so that they are known here.
789	!------------------------------------------------------------------------------!
790	SUBROUTINE get_variable_4d_real( id, variable_name, i, j, var, n3, n4 )
791
792	IMPLICIT NONE
793
794	CHARACTER(LEN=*) :: variable_name !< variable name
795
796	INTEGER(iwp), INTENT(IN) :: i !< index along x direction
797	INTEGER(iwp), INTENT(IN) :: id !< file id
798	INTEGER(iwp) :: id_var !< variable id
799	INTEGER(iwp), INTENT(IN) :: j !< index along y direction
800	INTEGER(iwp), INTENT(IN) :: n3 !< number of data-points along 3rd dimension
801	INTEGER(iwp), INTENT(IN) :: n4 !< number of data-points along 4th dimension
802
803	REAL(wp), DIMENSION(:,:), INTENT(INOUT) :: var !< variable to be read
804	#if defined( __netcdf )
805
806	!
807	!-- Inquire variable id
808	nc_stat = NF90_INQ_VARID( id, TRIM( variable_name ), id_var )
809	!
810	!-- Get variable
811	nc_stat = NF90_GET_VAR( id, id_var, var, &
812	start = (/ i+1, j+1, 1, 1 /), &
813	count = (/ 1, 1, n3, n4 /) )
814
815	CALL handle_error( 'get_variable_4d_real', 533 )
816	#endif
817	END SUBROUTINE get_variable_4d_real
818
819	!------------------------------------------------------------------------------!
820	! Description:
821	! ------------
822	!> Prints out a text message corresponding to the current status.
823	!------------------------------------------------------------------------------!
824	SUBROUTINE handle_error( routine_name, errno )
825
826	IMPLICIT NONE
827
828	CHARACTER(LEN=6) :: message_identifier
829	CHARACTER(LEN=*) :: routine_name
830	CHARACTER(LEN=100) :: message_string
831
832	INTEGER(iwp) :: errno
833	#if defined( __netcdf )
834
835	IF ( nc_stat /= NF90_NOERR ) THEN
836
837	WRITE( message_identifier, '(''NC'',I4.4)' ) errno
838
839	message_string = TRIM( NF90_STRERROR( nc_stat ) )
840
841	WRITE(,) routine_name,' ', message_identifier,' ', TRIM(message_string)
842	WRITE(,) 'Aborting NavMesh-tool'
843
844	ENDIF
845
846	#endif
847	END SUBROUTINE handle_error
848
849
850	!------------------------------------------------------------------------------!
851	! Description:
852	! ------------
853	!> Inquires the variable names belonging to a file.
854	!------------------------------------------------------------------------------!
855	SUBROUTINE inquire_variable_names( id, var_names )
856
857	IMPLICIT NONE
858
859	CHARACTER(LEN=*), DIMENSION(:), INTENT(INOUT) :: var_names !< return variable - variable names
860	INTEGER(iwp) :: i !< loop variable
861	INTEGER(iwp), INTENT(IN) :: id !< file id
862	INTEGER(iwp) :: num_vars !< number of variables (unused return parameter)
863	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: varids !< dummy array to strore variable ids temporarily
864	#if defined( __netcdf )
865
866	ALLOCATE( varids(1:SIZE(var_names)) )
867	nc_stat = NF90_INQ_VARIDS( id, NVARS = num_vars, VARIDS = varids )
868	CALL handle_error( 'inquire_variable_names', 535 )
869
870	DO i = 1, SIZE(var_names)
871	nc_stat = NF90_INQUIRE_VARIABLE( id, varids(i), NAME = var_names(i) )
872	CALL handle_error( 'inquire_variable_names', 535 )
873	ENDDO
874
875	DEALLOCATE( varids )
876	#endif
877	END SUBROUTINE inquire_variable_names
878
879	!------------------------------------------------------------------------------!
880	! Description:
881	! ------------
882	!> Reads global or variable-related attributes of type INTEGER (32-bit)
883	!------------------------------------------------------------------------------!
884	SUBROUTINE get_attribute_int32( id, attribute_name, value, global, &
885	variable_name )
886
887	IMPLICIT NONE
888
889	CHARACTER(LEN=*) :: attribute_name !< attribute name
890	CHARACTER(LEN=*), OPTIONAL :: variable_name !< variable name
891
892	INTEGER(iwp), INTENT(IN) :: id !< file id
893	INTEGER(iwp) :: id_var !< variable id
894	INTEGER(iwp), INTENT(INOUT) :: value !< read value
895
896	LOGICAL, INTENT(IN) :: global !< flag indicating global attribute
897	#if defined( __netcdf )
898
899	!
900	!-- Read global attribute
901	IF ( global ) THEN
902	nc_stat = NF90_GET_ATT( id, NF90_GLOBAL, TRIM( attribute_name ), value )
903	CALL handle_error( 'get_attribute_int32 global', 522 )
904	!
905	!-- Read attributes referring to a single variable. Therefore, first inquire
906	!-- variable id
907	ELSE
908	nc_stat = NF90_INQ_VARID( id, TRIM( variable_name ), id_var )
909	CALL handle_error( 'get_attribute_int32', 522 )
910	nc_stat = NF90_GET_ATT( id, id_var, TRIM( attribute_name ), value )
911	CALL handle_error( 'get_attribute_int32', 522 )
912	ENDIF
913	#endif
914	END SUBROUTINE get_attribute_int32
915
916	!------------------------------------------------------------------------------!
917	! Description:
918	! ------------
919	!> Reads global or variable-related attributes of type INTEGER (8-bit)
920	!------------------------------------------------------------------------------!
921	SUBROUTINE get_attribute_int8( id, attribute_name, value, global, &
922	variable_name )
923
924	IMPLICIT NONE
925
926	CHARACTER(LEN=*) :: attribute_name !< attribute name
927	CHARACTER(LEN=*), OPTIONAL :: variable_name !< variable name
928
929	INTEGER(iwp), INTENT(IN) :: id !< file id
930	INTEGER(iwp) :: id_var !< variable id
931	INTEGER(KIND=1), INTENT(INOUT) :: value !< read value
932
933	LOGICAL, INTENT(IN) :: global !< flag indicating global attribute
934	#if defined( __netcdf )
935
936	!
937	!-- Read global attribute
938	IF ( global ) THEN
939	nc_stat = NF90_GET_ATT( id, NF90_GLOBAL, TRIM( attribute_name ), value )
940	CALL handle_error( 'get_attribute_int8 global', 523 )
941	!
942	!-- Read attributes referring to a single variable. Therefore, first inquire
943	!-- variable id
944	ELSE
945	nc_stat = NF90_INQ_VARID( id, TRIM( variable_name ), id_var )
946	CALL handle_error( 'get_attribute_int8', 523 )
947	nc_stat = NF90_GET_ATT( id, id_var, TRIM( attribute_name ), value )
948	CALL handle_error( 'get_attribute_int8', 523 )
949	ENDIF
950	#endif
951	END SUBROUTINE get_attribute_int8
952
953	!------------------------------------------------------------------------------!
954	! Description:
955	! ------------
956	!> Reads global or variable-related attributes of type REAL
957	!------------------------------------------------------------------------------!
958	SUBROUTINE get_attribute_real( id, attribute_name, value, global, &
959	variable_name )
960
961	IMPLICIT NONE
962
963	CHARACTER(LEN=*) :: attribute_name !< attribute name
964	CHARACTER(LEN=*), OPTIONAL :: variable_name !< variable name
965
966	INTEGER(iwp), INTENT(IN) :: id !< file id
967	INTEGER(iwp) :: id_var !< variable id
968
969	LOGICAL, INTENT(IN) :: global !< flag indicating global attribute
970
971	REAL(wp), INTENT(INOUT) :: value !< read value
972	#if defined( __netcdf )
973
974
975	!
976	!-- Read global attribute
977	IF ( global ) THEN
978	nc_stat = NF90_GET_ATT( id, NF90_GLOBAL, TRIM( attribute_name ), value )
979	CALL handle_error( 'get_attribute_real global', 524 )
980	!
981	!-- Read attributes referring to a single variable. Therefore, first inquire
982	!-- variable id
983	ELSE
984	nc_stat = NF90_INQ_VARID( id, TRIM( variable_name ), id_var )
985	CALL handle_error( 'get_attribute_real', 524 )
986	nc_stat = NF90_GET_ATT( id, id_var, TRIM( attribute_name ), value )
987	CALL handle_error( 'get_attribute_real', 524 )
988	ENDIF
989	#endif
990	END SUBROUTINE get_attribute_real
991
992	!------------------------------------------------------------------------------!
993	! Description:
994	! ------------
995	!> Reads global or variable-related attributes of type CHARACTER
996	!> Remark: reading attributes of type NF_STRING return an error code 56 -
997	!> Attempt to convert between text & numbers.
998	!------------------------------------------------------------------------------!
999	SUBROUTINE get_attribute_string( id, attribute_name, value, global, &
1000	variable_name )
1001
1002	IMPLICIT NONE
1003
1004	CHARACTER(LEN=*) :: attribute_name !< attribute name
1005	CHARACTER(LEN=*), OPTIONAL :: variable_name !< variable name
1006	CHARACTER(LEN=*), INTENT(INOUT) :: value !< read value
1007
1008	INTEGER(iwp), INTENT(IN) :: id !< file id
1009	INTEGER(iwp) :: id_var !< variable id
1010
1011	LOGICAL, INTENT(IN) :: global !< flag indicating global attribute
1012	#if defined( __netcdf )
1013
1014	!
1015	!-- Read global attribute
1016	IF ( global ) THEN
1017	nc_stat = NF90_GET_ATT( id, NF90_GLOBAL, TRIM( attribute_name ), value )
1018	CALL handle_error( 'get_attribute_string global', 525 )
1019	!
1020	!-- Read attributes referring to a single variable. Therefore, first inquire
1021	!-- variable id
1022	ELSE
1023	nc_stat = NF90_INQ_VARID( id, TRIM( variable_name ), id_var )
1024	CALL handle_error( 'get_attribute_string', 525 )
1025
1026	nc_stat = NF90_GET_ATT( id, id_var, TRIM( attribute_name ), value )
1027	CALL handle_error( 'get_attribute_string',525 )
1028	ENDIF
1029	#endif
1030	END SUBROUTINE get_attribute_string
1031
1032	END MODULE
1033
1034	MODULE mod_functions
1035
1036	USE kinds
1037
1038	PRIVATE
1039	PUBLIC dist_point_to_edge, intersect, is_left, is_right
1040
1041	CONTAINS
1042
1043	!
1044	!-- Calculates distance of point P to edge (A,B). If A = B, calculates
1045	!-- point-to-point distance from A/B to P
1046	FUNCTION dist_point_to_edge ( a_x, a_y, b_x, b_y, p_x, p_y )
1047
1048	IMPLICIT NONE
1049
1050	REAL(wp) :: ab_x !< x-coordinate of vector from A to B
1051	REAL(wp) :: ab_y !< y-coordinate of vector from A to B
1052	REAL(wp) :: ab_d !< inverse length of vector from A to B
1053	REAL(wp) :: ab_u_x !< x-coordinate of vector with direction of ab and length 1
1054	REAL(wp) :: ab_u_y !< y-coordinate of vector with direction of ab and length 1
1055	REAL(wp) :: ba_x !< x-coordinate of vector from B to A
1056	REAL(wp) :: ba_y !< y-coordinate of vector from B to A
1057	REAL(wp) :: ap_x !< x-coordinate of vector from A to P
1058	REAL(wp) :: ap_y !< y-coordinate of vector from A to P
1059	REAL(wp) :: bp_x !< x-coordinate of vector from B to P
1060	REAL(wp) :: bp_y !< y-coordinate of vector from B to P
1061	REAL(wp) :: a_x !< x-coordinate of point A of edge
1062	REAL(wp) :: a_y !< y-coordinate of point A of edge
1063	REAL(wp) :: b_x !< x-coordinate of point B of edge
1064	REAL(wp) :: b_y !< y-coordinate of point B of edge
1065	REAL(wp) :: p_x !< x-coordinate of point P
1066	REAL(wp) :: p_y !< y-coordinate of point P
1067	REAL(wp) :: dist_x !< x-coordinate of point P
1068	REAL(wp) :: dist_y !< y-coordinate of point P
1069	REAL(wp) :: dist_point_to_edge !< y-coordinate of point P
1070
1071	ab_x = - a_x + b_x
1072	ab_y = - a_y + b_y
1073	ba_x = - b_x + a_x
1074	ba_y = - b_y + a_y
1075	ap_x = - a_x + p_x
1076	ap_y = - a_y + p_y
1077	bp_x = - b_x + p_x
1078	bp_y = - b_y + p_y
1079
1080	IF ( ab_x * ap_x + ab_y * ap_y <= 0. ) THEN
1081	dist_point_to_edge = SQRT((a_x - p_x)2 + (a_y - p_y)2)
1082	ELSEIF ( ba_x * bp_x + ba_y * bp_y <= 0. ) THEN
1083	dist_point_to_edge = SQRT((b_x - p_x)2 + (b_y - p_y)2)
1084	ELSE
1085	ab_d = 1./SQRT((ab_x)2+(ab_y)2)
1086	ab_u_x = ab_x*ab_d
1087	ab_u_y = ab_y*ab_d
1088	dist_x = ap_x - (ap_xab_u_x+ap_yab_u_y)*ab_u_x
1089	dist_y = ap_y - (ap_xab_u_x+ap_yab_u_y)*ab_u_y
1090	dist_point_to_edge = SQRT( dist_x2 + dist_y2 )
1091	ENDIF
1092
1093	RETURN
1094
1095	END FUNCTION dist_point_to_edge
1096
1097	!
1098	!-- Returns true if the line segments AB and PQ share an intersection
1099	FUNCTION intersect ( ax, ay, bx, by, px, py, qx, qy )
1100
1101	IMPLICIT NONE
1102
1103	LOGICAL :: intersect !< return value; TRUE if intersection was found
1104	LOGICAL :: la !< T if a is left of PQ
1105	LOGICAL :: lb !< T if b is left of PQ
1106	LOGICAL :: lp !< T if p is left of AB
1107	LOGICAL :: lq !< T if q is left of AB
1108	LOGICAL :: poss !< flag that indicates if an intersection is still possible
1109	LOGICAL :: ra !< T if a is right of PQ
1110	LOGICAL :: rb !< T if b is right of PQ
1111	LOGICAL :: rp !< T if p is right of AB
1112	LOGICAL :: rq !< T if q is right of AB
1113
1114	REAL(wp) :: ax !< x-coordinate of point A
1115	REAL(wp) :: ay !< y-coordinate of point A
1116	REAL(wp) :: bx !< x-coordinate of point B
1117	REAL(wp) :: by !< y-coordinate of point B
1118	REAL(wp) :: px !< x-coordinate of point P
1119	REAL(wp) :: py !< y-coordinate of point P
1120	REAL(wp) :: qx !< x-coordinate of point Q
1121	REAL(wp) :: qy !< y-coordinate of point Q
1122
1123	intersect = .FALSE.
1124	poss = .FALSE.
1125	!
1126	!-- Intersection is possible only if P and Q are on opposing sides of AB
1127	lp = is_left(ax,ay,bx,by,px,py)
1128	rq = is_right(ax,ay,bx,by,qx,qy)
1129	IF ( lp .AND. rq ) poss = .TRUE.
1130	IF ( .NOT. poss ) THEN
1131	lq = is_left(ax,ay,bx,by,qx,qy)
1132	rp = is_right(ax,ay,bx,by,px,py)
1133	IF ( lq .AND. rp ) poss = .TRUE.
1134	ENDIF
1135	!
1136	!-- Intersection occurs only if above test (poss) was true AND
1137	!-- A and B are on opposing sides of PQ
1138	IF ( poss ) THEN
1139	la = is_left(px,py,qx,qy,ax,ay)
1140	rb = is_right(px,py,qx,qy,bx,by)
1141	IF ( la .AND. rb ) intersect = .TRUE.
1142	IF ( .NOT. intersect ) THEN
1143	lb = is_left(px,py,qx,qy,bx,by)
1144	ra = is_right(px,py,qx,qy,ax,ay)
1145	IF ( lb .AND. ra ) intersect = .TRUE.
1146	ENDIF
1147	ENDIF
1148
1149	RETURN
1150
1151	END FUNCTION intersect
1152
1153	!
1154	!-- Calculates if point P is left of the infinite
1155	!-- line that contains A and B (direction: A to B)
1156	!-- Concept: 2D rotation of two vectors
1157	FUNCTION is_left ( ax, ay, bx, by, px, py )
1158
1159	IMPLICIT NONE
1160
1161	LOGICAL :: is_left !< return value; TRUE if P is left of AB
1162
1163	REAL(wp) :: ax !< x-coordinate of point A
1164	REAL(wp) :: ay !< y-coordinate of point A
1165	REAL(wp) :: bx !< x-coordinate of point B
1166	REAL(wp) :: by !< y-coordinate of point B
1167	REAL(wp) :: px !< x-coordinate of point P
1168	REAL(wp) :: py !< y-coordinate of point P
1169	!
1170	!-- 2D-rotation
1171	is_left = (bx-ax)(py-ay)-(px-ax)(by-ay) > 0
1172	!
1173	!-- False if the point is on the line (or very close)
1174	IF ( (ABS(ax-px) < .001 .AND. ABS(ay-py) < .001) .OR. &
1175	(ABS(bx-px) < .001 .AND. ABS(by-py) < .001) ) &
1176	THEN
1177	is_left = .FALSE.
1178	ENDIF
1179
1180	RETURN
1181
1182	END FUNCTION is_left
1183
1184	!
1185	!-- Calculates if point P is right of the infinite
1186	!-- line that contains A and B (direction: A to B)
1187	!-- Concept: 2D rotation of two vectors
1188	FUNCTION is_right ( ax, ay, bx, by, px, py )
1189
1190	IMPLICIT NONE
1191
1192	LOGICAL :: is_right !< return value; TRUE if P is right of AB
1193
1194	REAL(wp), INTENT(IN) :: ax !< x-coordinate of point A
1195	REAL(wp), INTENT(IN) :: ay !< y-coordinate of point A
1196	REAL(wp), INTENT(IN) :: bx !< x-coordinate of point B
1197	REAL(wp), INTENT(IN) :: by !< y-coordinate of point B
1198	REAL(wp), INTENT(IN) :: px !< x-coordinate of point P
1199	REAL(wp), INTENT(IN) :: py !< y-coordinate of point P
1200
1201	!
1202	!-- 2D-rotation
1203	is_right = (bx-ax)(py-ay)-(px-ax)(by-ay) < 0
1204	!
1205	!-- False if the point is on the line (or very close)
1206	IF ( (ABS(ax-px) < .001 .AND. ABS(ay-py) < .001) .OR. &
1207	(ABS(bx-px) < .001 .AND. ABS(by-py) < .001) ) &
1208	THEN
1209	is_right = .FALSE.
1210	ENDIF
1211
1212	RETURN
1213
1214	END FUNCTION is_right
1215
1216	END MODULE mod_functions
1217
1218	MODULE polygon_creation
1219
1220	USE kinds
1221
1222	USE mod_functions
1223
1224	USE variables
1225
1226	USE data_input
1227
1228	CONTAINS
1229
1230	!------------------------------------------------------------------------------!
1231	! Description:
1232	! ------------
1233	!> Initialisation, allocation, and reading of some input
1234	!------------------------------------------------------------------------------!
1235	SUBROUTINE init
1236
1237	IMPLICIT NONE
1238
1239	CHARACTER(LEN=200) :: dirname
1240	CHARACTER(LEN=200) :: rundir
1241	CHARACTER(LEN=200) :: input_trunk
1242	CHARACTER (LEN=80) :: line !<
1243
1244	CHARACTER(LEN=2),DIMENSION(1:5) :: run_pars
1245
1246	INTEGER(iwp) :: status
1247	INTEGER(iwp) :: getcwd
1248	INTEGER(iwp) :: ie
1249	INTEGER(iwp) :: is
1250
1251	LOGICAL :: p3d_flag = .FALSE. !< indicates whether p3d file was found
1252
1253	NAMELIST /prepro_par/ flag_2d, internal_buildings, tolerance_dp
1254
1255	WRITE(*,'(X,A)') &
1256	"o----------------------------------------------o", &
1257	"\| o------------------------------------------o \|", &
1258	"\| \| __ ____ ____ ____ \| \|", &
1259	"\| \| / _\ ( _ \(_ _) ___ ( _ \ \| \|", &
1260	"\| \| / \ ) __/ )( (___) ) __/ \| \|", &
1261	"\| \| \_/\_/(__) (__) (__) \| \|", &
1262	"\| \| \| \|", &
1263	"\| \| Agent Preprocessing Tool for PALM \| \|", &
1264	"\| o------------------------------------------o \|", &
1265	"o----------------------------------------------o"
1266
1267	!
1268	!-- Identify run name and Input files
1269	status = getcwd( dirname )
1270	IF ( status /= 0 ) STOP 'getcwd: error'
1271	ie = INDEX(dirname, '/', BACK=.TRUE.)
1272	is = INDEX(dirname(1:ie-1), '/', BACK=.TRUE.)
1273	IF ( TRIM(ADJUSTL(dirname(ie+1:))) /= 'INPUT' ) THEN
1274	WRITE(*,'(3X,A)') 'NavMesh was called from', &
1275	' ', TRIM(ADJUSTL(dirname)), ' ', &
1276	'and is now aborting. Please call this tool', &
1277	'from the INPUT-folder of your job directory.'
1278	STOP
1279	ENDIF
1280	runname = TRIM(ADJUSTL(dirname(is+1:ie-1)))
1281	rundir = TRIM(ADJUSTL(dirname(1:ie)))
1282	input_trunk = TRIM(rundir)//'INPUT/'//TRIM(runname)
1283
1284	!
1285	!-- Check for parameter file
1286	INQUIRE( FILE = TRIM( input_trunk )//'_p3d', EXIST = p3d_flag )
1287	IF ( .NOT. p3d_flag ) THEN
1288	WRITE(*,'(3(3X,A,/))') 'No _p3d file was found. Aborting.', &
1289	'I was looking for the file', &
1290	TRIM( input_trunk )//'_p3d'
1291	STOP
1292	ELSE
1293	WRITE(*,'(2(3X,A,/))') 'The following input file will be used:', &
1294	TRIM( input_trunk )//'_p3d'
1295	ENDIF
1296
1297	!
1298	!-- Read run parameters from run parameter file (_p3d), though not from
1299	!-- namelist.
1300	run_pars = (/'dx','dy','dz','nx','ny'/)
1301	OPEN ( 11, FILE=TRIM(input_trunk)//'_p3d', FORM='FORMATTED', &
1302	STATUS='OLD' )
1303	DO i = 1, SIZE(run_pars)
1304	REWIND ( 11 )
1305	line = ' '
1306	DO WHILE ( INDEX( line, run_pars(i) ) == 0 )
1307	READ ( 11, '(A)', END=10 ) line
1308	IF ( INDEX(line, '!') /= 0 ) THEN
1309	IF ( INDEX(line, run_pars(i)) > INDEX(line, '!' ) ) THEN
1310	line = ' '
1311	CYCLE
1312	ENDIF
1313	ENDIF
1314	ENDDO
1315	line = TRIM(ADJUSTL(line(INDEX(line,'=')+1:INDEX(line,',')-1)))
1316	SELECT CASE (i)
1317	CASE(1)
1318	READ(line,*) dx
1319	CASE(2)
1320	READ(line,*) dy
1321	CASE(3)
1322	READ(line,*) dz
1323	CASE(4)
1324	READ(line,*) nx
1325	CASE(5)
1326	READ(line,*) ny
1327	CASE DEFAULT
1328	END SELECT
1329	ENDDO
1330	10 CONTINUE
1331
1332	!
1333	!-- Try to find prepro package
1334	REWIND ( 11 )
1335	line = ' '
1336	DO WHILE ( INDEX( line, '&prepro_par' ) == 0 )
1337	READ ( 11, '(A)', END=20 ) line
1338	ENDDO
1339	BACKSPACE ( 11 )
1340
1341	!
1342	!-- Read user-defined namelist
1343	READ ( 11, prepro_par )
1344
1345	20 CONTINUE
1346	CLOSE( 11 )
1347
1348	!
1349	!-- If tolerance_dp was not set, put in default values
1350	DO i = 0, 2
1351	IF ( tolerance_dp(i) > 999998.0_wp ) THEN
1352	tolerance_dp(i) = SQRT(dxdy)1.41/(2**i)
1353	ELSE
1354	tolerance_dp(i) = tolerance_dp(i)SQRT(dxdy)
1355	ENDIF
1356	ENDDO
1357
1358	!
1359	!-- Allocate arrays
1360	ALLOCATE(obstacle_height(-3:nx+3,-3:ny+3), polygon_id(-3:nx+3,-3:ny+3), &
1361	wall_flags_0(-3:nx+3,-3:ny+3), grid(-3:nx+3,-3:ny+3))
1362	!
1363	!-- Set null_vertex
1364	CALL set_vertex(null_vertex,0.0_wp,0.0_wp)
1365	!
1366	!-- Some initializations
1367	ddx = 1./dx
1368	ddy = 1./dy
1369
1370	polygon_id = 0
1371	obstacle_height = 0.
1372
1373	grid%checked = .FALSE.
1374	grid(-3:-1,:)%checked = .TRUE.
1375	grid(nx+1:nx+3,:)%checked = .TRUE.
1376	grid(:,-3:-1)%checked = .TRUE.
1377	grid(:,ny+1:ny+3)%checked = .TRUE.
1378	grid%polygon_id = 0
1379	!
1380	!-- Open files and topography/building data
1381	CALL netcdf_data_input_topo ( TRIM(input_trunk) )
1382
1383	END SUBROUTINE init
1384
1385	!------------------------------------------------------------------------------!
1386	! Description:
1387	! ------------
1388	!> Identifies all grid boxes that belong to a building and assigns a building
1389	!> number to each grid box.
1390	!> Method: Scans each grid point. If a grid point was not previously checked
1391	!> and contains a building, it is added to a new polygon and marked as
1392	!> checked. Then, all its neighbors that also contain a building are
1393	!> added to the same polygon and marked as checked. All neighbors of
1394	!> neighbors are subsequently found, added and checked until none are
1395	!> left. Then, the initial scan continues, skipping already checked
1396	!> grid points. Once a grid point with a new building is found, the
1397	!> polygon_id increases and the grid point and all others that belong
1398	!> to the same building are added as described above.
1399	!> NOTE: This procedure will identify grid points that are only connected
1400	!> diagonally (share only one point with each other) as connected and
1401	!> have them belonging to the same building. This is necessary, as an
1402	!> agent will not be able to traverse between these grid points and the
1403	!> navigation mesh will therefore have to make him circumvent this
1404	!> point.
1405	!------------------------------------------------------------------------------!
1406	SUBROUTINE identify_polygons
1407
1408	IMPLICIT NONE
1409
1410	INTEGER(iwp) :: ii !< local counter
1411	INTEGER(iwp) :: il !< local counter
1412	INTEGER(iwp) :: jj !< local counter
1413	INTEGER(iwp) :: jl !< local counter
1414	INTEGER(iwp) :: gpil !< number of grid points in list
1415	INTEGER(iwp) :: gpta !< number of grid points to add to grid_list
1416
1417	TYPE(grid_point), DIMENSION(1:7) :: add_to_grid_list !< grid points to be added to the list
1418
1419	TYPE(grid_point), DIMENSION(:), ALLOCATABLE :: dummy_grid_list !< dummy for reallocation of grid_list
1420	TYPE(grid_point), DIMENSION(:), ALLOCATABLE :: grid_list !< list of grid points that belong to the current building but whose neighbors have not been checked yet
1421
1422	!
1423	!-- Initialize wall_flags array: 1 where no buildings, 0 where buildings
1424	wall_flags_0 = 1
1425	DO i = 0, nx
1426	DO j = 0, ny
1427	IF ( obstacle_height(i,j) > 0 ) THEN
1428	wall_flags_0(i,j) = 0
1429	ENDIF
1430	ENDDO
1431	ENDDO
1432	DEALLOCATE(obstacle_height)
1433	polygon_counter = 0
1434	gpil = 0
1435	gpta = 0
1436	ALLOCATE(grid_list(1:100))
1437	!
1438	!-- Declare all grid points that contain no buildings as already checked.
1439	!-- This way, these points will be skipped in the following calculation and
1440	!-- will have polygon_id = 0
1441	DO i = 0, nx
1442	DO j = 0, ny
1443	IF ( BTEST( wall_flags_0(i,j), 0 ) ) THEN
1444	grid(i,j)%checked = .TRUE.
1445	ENDIF
1446	ENDDO
1447	ENDDO
1448	!
1449	!-- Check all grid points and process them
1450	DO i = 0, nx
1451	DO j = 0, ny
1452	!
1453	!-- If the current grid point has not been checked, mark it as checked.
1454	!-- As it is the first point belonging to a new building, increase the
1455	!-- polygon_id counter and associate the grid point with that id.
1456	IF ( .NOT. grid(i,j)%checked ) THEN
1457	polygon_counter = polygon_counter + 1
1458	grid(i,j)%polygon_id = polygon_counter
1459	grid(i,j)%checked = .TRUE.
1460	!
1461	!-- Check if any neighbors of the found grid point are part of a
1462	!-- building too. If so, add them to the list of grid points
1463	!-- that have to be checked and associate them with the same polygon
1464	gpta = 0
1465	DO ii = i-1, i+1
1466	DO jj = j-1, j+1
1467	IF ( ii == i .AND. jj == j ) CYCLE
1468	IF ( .NOT. grid(ii,jj)%checked ) THEN
1469	gpta = gpta + 1
1470	add_to_grid_list(gpta)%i = ii
1471	add_to_grid_list(gpta)%j = jj
1472	ENDIF
1473	ENDDO
1474	ENDDO
1475
1476	!
1477	!-- Change size of grid_list if it becomes too small
1478	IF ( gpil + gpta > SIZE(grid_list) ) THEN
1479	ALLOCATE(dummy_grid_list(1:gpil))
1480	dummy_grid_list = grid_list(1:gpil)
1481	DEALLOCATE(grid_list)
1482	ALLOCATE(grid_list(1:2*(gpil+gpta)))
1483	grid_list(1:gpil) = dummy_grid_list(1:gpil)
1484	DEALLOCATE(dummy_grid_list)
1485	ENDIF
1486	!
1487	!-- If there are grid points to add to grid_list, add them
1488	IF ( gpta > 0 ) THEN
1489	grid_list(gpil+1:gpil+gpta) = add_to_grid_list(1:gpta)
1490	gpil = gpil + gpta
1491	ENDIF
1492	!
1493	!-- Handle all grid points in grid_list until there are none left
1494	DO WHILE (gpil>0)
1495	il = grid_list(gpil)%i
1496	jl = grid_list(gpil)%j
1497	grid(il,jl)%polygon_id = polygon_counter
1498	grid(il,jl)%checked = .TRUE.
1499	!
1500	!-- this grid point in the list is processed, so the number of
1501	!-- grid points in the list can be reduced by one
1502	gpil = gpil - 1
1503	gpta = 0
1504	!
1505	!-- For the current grid point, check if any unchecked
1506	!-- neighboring grid points also contain a building. All such
1507	!-- grid points are added to the list of grid points to be
1508	!-- handled in this loop
1509	DO ii = il-1, il+1
1510	DO jj = jl-1, jl+1
1511	IF ( jj == jl .AND. ii == il ) CYCLE
1512	IF ( .NOT. grid(ii,jj)%checked ) &
1513	THEN
1514	gpta = gpta + 1
1515	add_to_grid_list(gpta)%i = ii
1516	add_to_grid_list(gpta)%j = jj
1517	ENDIF
1518	ENDDO
1519	ENDDO
1520	!
1521	!-- Change size of grid list if it becomes too small
1522	IF ( gpil + gpta > SIZE(grid_list) ) THEN
1523	ALLOCATE(dummy_grid_list(1:gpil))
1524	dummy_grid_list = grid_list(1:gpil)
1525	DEALLOCATE(grid_list)
1526	ALLOCATE(grid_list(1:2*(gpil+gpta)))
1527	grid_list(1:gpil) = dummy_grid_list(1:gpil)
1528	DEALLOCATE(dummy_grid_list)
1529	ENDIF
1530	!
1531	!-- If there are grid points to add to list, add them
1532	IF ( gpta > 0 ) THEN
1533	grid_list(gpil+1:gpil+gpta) = add_to_grid_list(1:gpta)
1534	gpil = gpil + gpta
1535	ENDIF
1536	ENDDO
1537	ENDIF
1538	ENDDO
1539	ENDDO
1540	DEALLOCATE(grid_list)
1541	!
1542	!-- Set size of polygon array and initialize
1543	ALLOCATE(polygons(1:polygon_counter))
1544	polygons%nov = 0
1545
1546	END SUBROUTINE identify_polygons
1547
1548	!------------------------------------------------------------------------------!
1549	! Description:
1550	! ------------
1551	!> Identifies the corners of the PALM building topography and adds them to
1552	!> a specific polygon for each building as vertices. This converts the gridded
1553	!> building data into one polygon per building that contains the coordinates of
1554	!> each inner and outer corner of that building as vertices.
1555	!> A grid point contains an outer corner if it's part of a building and exactly
1556	!> one of its horizontal and one of its vertical neighbors is also part of a
1557	!> building (4 cases).
1558	!> A grid point contains an inner corner if it's not part of a building and
1559	!> exactly one of its horizontal, one of its diagonal and one of its vertical
1560	!> neighbors are each part of a building and in turn neighbors
1561	!> to each other (4 cases).
1562	!------------------------------------------------------------------------------!
1563	SUBROUTINE identify_corners
1564
1565	IMPLICIT NONE
1566
1567	INTEGER(iwp) :: p_id !< current polygon_id
1568	!
1569	!-- For all grid points, check whether it contains one or more corners
1570	DO i = 0, nx
1571	DO j = 0, ny
1572	!
1573	!-- First, check if grid contains topography and has a corner.
1574	IF ( .NOT. BTEST( wall_flags_0(i,j), 0 ) ) THEN
1575	!
1576	!-- Corner at south left edge of grid cell
1577	IF ( BTEST( wall_flags_0(i-1,j), 0 ) .AND. &
1578	BTEST( wall_flags_0(i,j-1), 0 )) &
1579	THEN
1580	p_id = grid(i,j)%polygon_id
1581	polygons(p_id)%nov = polygons(p_id)%nov + 1
1582	nov = polygons(p_id)%nov
1583	CALL set_vertex(dummy_vertex, idx, jdy)
1584	CALL add_vertex_to_polygon(dummy_vertex, p_id, nov)
1585	ENDIF
1586	!
1587	!-- Corner at north left edge of grid cell
1588	IF ( BTEST( wall_flags_0(i-1,j), 0 ) .AND. &
1589	BTEST( wall_flags_0(i,j+1), 0 )) &
1590	THEN
1591	p_id = grid(i,j)%polygon_id
1592	polygons(p_id)%nov = polygons(p_id)%nov + 1
1593	nov = polygons(p_id)%nov
1594	CALL set_vertex(dummy_vertex, idx, (j+1)dy)
1595	CALL add_vertex_to_polygon(dummy_vertex, p_id, nov)
1596	ENDIF
1597	!
1598	!-- Corner at north right edge of grid cell
1599	IF ( BTEST( wall_flags_0(i+1,j), 0 ) .AND. &
1600	BTEST( wall_flags_0(i,j+1), 0 )) &
1601	THEN
1602	p_id = grid(i,j)%polygon_id
1603	polygons(p_id)%nov = polygons(p_id)%nov + 1
1604	nov = polygons(p_id)%nov
1605	CALL set_vertex(dummy_vertex, (i+1)dx, (j+1)dy)
1606	CALL add_vertex_to_polygon(dummy_vertex, p_id, nov)
1607	ENDIF
1608	!
1609	!-- Corner at south right edge of grid cell
1610	IF ( BTEST( wall_flags_0(i+1,j), 0 ) .AND. &
1611	BTEST( wall_flags_0(i,j-1), 0 )) &
1612	THEN
1613	p_id = grid(i,j)%polygon_id
1614	polygons(p_id)%nov = polygons(p_id)%nov + 1
1615	nov = polygons(p_id)%nov
1616	CALL set_vertex(dummy_vertex, (i+1)dx, jdy)
1617	CALL add_vertex_to_polygon(dummy_vertex, p_id, nov)
1618	ENDIF
1619	!
1620	!-- Second, check if grid contains no topography and has a corner.
1621	ELSE
1622	!
1623	!-- Corner at south left edge of grid cell
1624	IF ( .NOT. BTEST( wall_flags_0(i-1,j), 0 ) .AND. &
1625	.NOT. BTEST( wall_flags_0(i,j-1), 0 ) .AND. &
1626	.NOT. BTEST( wall_flags_0(i-1,j-1), 0 ) ) &
1627	THEN
1628	p_id = grid(i-1,j-1)%polygon_id
1629	polygons(p_id)%nov = polygons(p_id)%nov + 1
1630	nov = polygons(p_id)%nov
1631	CALL set_vertex(dummy_vertex, idx, jdy)
1632	CALL add_vertex_to_polygon(dummy_vertex, p_id, nov)
1633	ENDIF
1634	!
1635	!-- Corner at north left edge of grid cell
1636	IF ( .NOT. BTEST( wall_flags_0(i-1,j), 0 ) .AND. &
1637	.NOT. BTEST( wall_flags_0(i,j+1), 0 ) .AND. &
1638	.NOT. BTEST( wall_flags_0(i-1,j+1), 0 ) ) &
1639	THEN
1640	p_id = grid(i-1,j+1)%polygon_id
1641	polygons(p_id)%nov = polygons(p_id)%nov + 1
1642	nov = polygons(p_id)%nov
1643	CALL set_vertex(dummy_vertex, idx, (j+1)dy)
1644	CALL add_vertex_to_polygon(dummy_vertex, p_id, nov)
1645	ENDIF
1646	!
1647	!-- Corner at north right edge of grid cell
1648	IF ( .NOT. BTEST( wall_flags_0(i+1,j), 0 ) .AND. &
1649	.NOT. BTEST( wall_flags_0(i,j+1), 0 ) .AND. &
1650	.NOT. BTEST( wall_flags_0(i+1,j+1), 0 ) ) &
1651	THEN
1652	p_id = grid(i+1,j+1)%polygon_id
1653	polygons(p_id)%nov = polygons(p_id)%nov + 1
1654	nov = polygons(p_id)%nov
1655	CALL set_vertex(dummy_vertex, (i+1)dx, (j+1)dy)
1656	CALL add_vertex_to_polygon(dummy_vertex, p_id, nov)
1657	ENDIF
1658	!
1659	!-- Corner at south right edge of grid cell
1660	IF ( .NOT. BTEST( wall_flags_0(i+1,j), 0 ) .AND. &
1661	.NOT. BTEST( wall_flags_0(i,j-1), 0 ) .AND. &
1662	.NOT. BTEST( wall_flags_0(i+1,j-1), 0 ) ) &
1663	THEN
1664	p_id = grid(i+1,j-1)%polygon_id
1665	polygons(p_id)%nov = polygons(p_id)%nov + 1
1666	nov = polygons(p_id)%nov
1667	CALL set_vertex(dummy_vertex, (i+1)dx, jdy)
1668	CALL add_vertex_to_polygon(dummy_vertex, p_id, nov)
1669	ENDIF
1670	ENDIF
1671	ENDDO
1672	ENDDO
1673
1674	END SUBROUTINE identify_corners
1675
1676	!------------------------------------------------------------------------------!
1677	! Description:
1678	! ------------
1679	!> Initializes a vertex
1680	!------------------------------------------------------------------------------!
1681	SUBROUTINE set_vertex (in_vertex, x, y)
1682
1683	IMPLICIT NONE
1684
1685	REAL(wp) :: x !< x-coordinate of vertex position
1686	REAL(wp) :: y !< y-coordinate of vertex position
1687
1688	TYPE(vertex_type) :: in_vertex !< vertex to be set
1689
1690	in_vertex%delete = .FALSE.
1691	in_vertex%x = x
1692	in_vertex%y = y
1693
1694	END SUBROUTINE set_vertex
1695
1696	!------------------------------------------------------------------------------!
1697	! Description:
1698	! ------------
1699	!> Adds an existing vertex to the polygon with ID p_id at position in_nov
1700	!------------------------------------------------------------------------------!
1701	SUBROUTINE add_vertex_to_polygon ( in_vertex, p_id, in_nov)
1702
1703	IMPLICIT NONE
1704
1705	INTEGER(iwp) :: in_nov !< counter of vertex being added to polygon
1706	INTEGER(iwp) :: p_id !< polygon ID
1707	INTEGER(iwp) :: sop !< size of vertices array
1708
1709	TYPE(vertex_type) :: in_vertex !< vertex to be added
1710
1711	TYPE(vertex_type), DIMENSION(:), ALLOCATABLE :: dummy_v_list !< for reallocation
1712
1713	polygon => polygons(p_id)
1714	!
1715	!-- Allocate and initialize the vertex array of the polygon, if necessary
1716	IF ( .NOT. ALLOCATED(polygon%vertices) ) THEN
1717	ALLOCATE(polygon%vertices(1:100))
1718	polygon%vertices = null_vertex
1719	ENDIF
1720	!
1721	!-- Adjust size of polygon, if necessary
1722	sop = SIZE(polygon%vertices)
1723	IF ( in_nov > sop ) THEN
1724	ALLOCATE(dummy_v_list(1:sop))
1725	dummy_v_list(1:sop) = polygon%vertices(1:sop)
1726	DEALLOCATE(polygon%vertices)
1727	ALLOCATE(polygon%vertices(1:2*sop))
1728	polygon%vertices = null_vertex
1729	polygon%vertices(1:sop) = dummy_v_list(1:sop)
1730	DEALLOCATE(dummy_v_list)
1731	ENDIF
1732	polygon%vertices(in_nov) = in_vertex
1733	END SUBROUTINE add_vertex_to_polygon
1734
1735	!------------------------------------------------------------------------------!
1736	! Description:
1737	! ------------
1738	!> Sorts the vertices of a polygon in a counter-clockwise fashion. During this
1739	!> process, all vertices that are not part of the hull of the building
1740	!> (inner courtyards) are deleted.
1741	!------------------------------------------------------------------------------!
1742	SUBROUTINE sort_polygon(i_p)
1743
1744	IMPLICIT NONE
1745
1746	LOGICAL :: starting_vertex_found
1747
1748	INTEGER(iwp) :: counter !< counter for potential starting vertices
1749	INTEGER(iwp) :: id_neighbor !< final ID of neighboring vertex
1750	INTEGER(iwp) :: id_neighbor1 !< ID of first potential neighbor
1751	INTEGER(iwp) :: id_neighbor2 !< ID of second potential neighbor
1752	INTEGER(iwp) :: il !< local counter
1753	INTEGER(iwp) :: i_p !< index of the current polygon
1754	INTEGER(iwp) :: noc !< number of candidates
1755	INTEGER(iwp) :: nosv !< number of sorted vertices
1756	INTEGER(iwp) :: xe !< x-end-index for building search
1757	INTEGER(iwp) :: xs !< x-start-index for building search
1758	INTEGER(iwp) :: ye !< y-end-index for building search
1759	INTEGER(iwp) :: ys !< y-start-index for building search
1760
1761	INTEGER, DIMENSION(:), ALLOCATABLE :: candidate_id !< ID of the potential neighbors stored in 'candidates'
1762	INTEGER, DIMENSION(:), ALLOCATABLE :: dummy_id_arr !< used for resizing
1763
1764	REAL(wp) :: dist !< distance of one vertex to its neighbor
1765	REAL(wp) :: m_x !< min/max x-value of polygon used for starting vertex
1766	REAL(wp) :: m_y !< min/max y-value of polygon used for starting vertex
1767
1768	TYPE(vertex_type) :: current_v !< current vertex
1769	TYPE(vertex_type) :: dummy_vertex !< dummy vertex for reordering
1770
1771	TYPE(vertex_type), DIMENSION(:), ALLOCATABLE :: candidates !< potential neighbors of the current vertex
1772	TYPE(vertex_type), DIMENSION(:), ALLOCATABLE :: dummy_vertex_arr !< used for resizing
1773	TYPE(vertex_type), DIMENSION(:), ALLOCATABLE :: sorted_p !< vertices that have been sorted
1774
1775	starting_vertex_found = .FALSE.
1776	ALLOCATE(sorted_p(1:nov))
1777	sorted_p(1:nov) = polygon%vertices(1:nov)
1778	!
1779	!-- Identify a vertex that is certainly a part of the outer hull of the
1780	!-- current polygon: Get rightmost border of polygon (or if that
1781	!-- coincides with model border, leftmost) border. Then of those points,
1782	!-- get northmost (or if that coincides with model domain border, southmost).
1783	!-- This identifies exactly one point that is then set to the first index.
1784	counter = 0
1785	IF ( MAXVAL(sorted_p%x) < nx*dx ) THEN
1786	m_x = MAXVAL(sorted_p%x)
1787	ELSE
1788	m_x = MINVAL(sorted_p%x)
1789	ENDIF
1790	DO il = 1, nov
1791	IF ( ABS( sorted_p(il)%x - m_x ) < .01 * dx ) THEN
1792	counter = counter + 1
1793	dummy_vertex = sorted_p(il)
1794	sorted_p(il) = sorted_p(counter)
1795	sorted_p(counter) = dummy_vertex
1796	ENDIF
1797	ENDDO
1798	IF ( MAXVAL(sorted_p(1:counter)%y) < ny*dy ) THEN
1799	m_y = MAXVAL(sorted_p(1:counter)%y)
1800	ELSE
1801	m_y = MINVAL(sorted_p(1:counter)%y)
1802	ENDIF
1803	DO il = 1, counter
1804	IF ( ABS(sorted_p(il)%y - m_y) < .01 * dy ) THEN
1805	dummy_vertex = sorted_p(il)
1806	sorted_p(il) = sorted_p(1)
1807	sorted_p(1) = dummy_vertex
1808	starting_vertex_found = .TRUE.
1809	EXIT
1810	ENDIF
1811	ENDDO
1812	!
1813	!-- If no starting vertex was found for the current polygon, it will be
1814	!-- deleted and an error message thrown
1815	IF ( .NOT. starting_vertex_found ) THEN
1816	WRITE(*,'(A,/,A,X,I6,/,A)') &
1817	'An error occured during polygon sorting:', &
1818	'no starting vertex could be found for polygon', &
1819	i_p, 'This polygon contains the following vertices (x/y)'
1820	DO il = 1, nov
1821	WRITE(*,'(4X,F8.1,X,F8.1)') &
1822	polygon%vertices(il)%x, polygon%vertices(il)%x
1823	ENDDO
1824	WRITE(*,'(A,/,A)') &
1825	'This polygon will be skipped during sorting and deleted',&
1826	'For details on the procedure, see SUBROUTINE sort_polygon.'
1827	polygon%vertices%delete = .TRUE.
1828	polygons(i_p)%nov = 0
1829	CALL delete_empty_polygons
1830	!
1831	!-- Find the unique neighbor of the current vertex. For this, first
1832	!-- determine all possible candidates. Of those, keep only the ones that
1833	!-- are connected to the current vertex along a building edge (the polygon
1834	!-- is sorted counter-clockwise. Therefore, the building is always on the
1835	!-- left-hand side of the connecting line from the current vertex to its
1836	!-- potential neighbor). This leaves a maximum of two possible neighbors.
1837	!-- This is only the case if the current vertex is the point that diagonally
1838	!-- connects two parts of the same building. In that case, the vertex that
1839	!-- lies to the right of the connecting line between the previous and
1840	!-- current vertex is the neighbor.
1841	ELSE
1842	DO nosv = 1, nov
1843	current_v = sorted_p(nosv)
1844	noc = 0
1845	ALLOCATE(candidates(1:100), candidate_id(1:100))
1846	!
1847	!-- Find all candidates that could be neighbors of current vertex:
1848	!-- these are those vertices that share the same x- or y-coordinate
1849	!-- with the current vertex, as the vertices are all inner and outer
1850	!-- corners of the gridded building data
1851	IF ( nosv < nov ) THEN
1852	DO il = nosv+1, nov
1853	IF ( ABS( current_v%x - sorted_p(il)%x ) < .01 * dx .OR. &
1854	ABS( current_v%y - sorted_p(il)%y ) < .01 * dy ) &
1855	THEN
1856	!
1857	!-- If necessary, resize arrays for candidates
1858	IF ( noc >= SIZE(candidates) ) THEN
1859	ALLOCATE(dummy_vertex_arr(1:noc), dummy_id_arr(1:noc))
1860	dummy_vertex_arr(1:noc) = candidates(1:noc)
1861	dummy_id_arr(1:noc) = candidate_id(1:noc)
1862	DEALLOCATE(candidates, candidate_id)
1863	ALLOCATE(candidates(1:2noc), candidate_id(1:2noc))
1864	candidates(1:noc) = dummy_vertex_arr(1:noc)
1865	candidate_id(1:noc) = dummy_id_arr(1:noc)
1866	DEALLOCATE(dummy_vertex_arr, dummy_id_arr)
1867	ENDIF
1868	noc = noc +1
1869	candidates(noc) = sorted_p(il)
1870	candidate_id(noc) = il
1871	ENDIF
1872	ENDDO
1873	ENDIF
1874	!
1875	!-- Check which one of the candidates is the neighbor of the current
1876	!-- vertex. This is done by several tests that would exclude the
1877	!-- candidate from being the neighbor. Each successful test will
1878	!-- therefore result in a cycle to the next candidate. Only if all
1879	!-- all tests fail, is the candidate one of a maximum of two possible
1880	!-- neighbors.
1881	id_neighbor = -999
1882	id_neighbor1 = -999
1883	id_neighbor2 = -999
1884	DO il = 1, noc
1885	!
1886	!-- Exclude the possibility of a vertex with the same coordinates
1887	!-- being chosen as the neighbor. (dist < .9*dx)
1888	!-- NOTE: this could happen, if part of a building is only connected
1889	!-- to the rest of the building diagonally. In that case, the
1890	!-- same point is added to the polygon twice. This is necessary
1891	!-- and not redundant! Two such points can never be neighbors.
1892	!-- Example: the north right corner of grid point i,j
1893	!-- AND the south left corner of grid point i+1,j+1.
1894	!-- See SUBROUTINE identify_corners for the identification
1895	!-- method.
1896	!-- Also, exclude a connection back to the coordinates of the
1897	!-- previous vertex.
1898	dist = SQRT( (candidates(il)%x - current_v%x)**2 + &
1899	(candidates(il)%y - current_v%y)**2 )
1900	IF ( nosv > 1 ) THEN
1901	IF ( dist < .9 * dx .OR. &
1902	( ( ABS( sorted_p(nosv-1)%x &
1903	- candidates(il)%x ) < .01 * dx ) .AND. &
1904	( ABS( sorted_p(nosv-1)%y &
1905	- candidates(il)%y ) < .01 * dy ) ) ) &
1906	THEN
1907	CYCLE
1908	ENDIF
1909	ENDIF
1910	!
1911	!-- Check if there is a building all along only the left-hand side
1912	!-- of the connecting line from current vertex to potential neighbor
1913	!-- (4 cases)
1914	!-- First: for vertical connection
1915	IF ( ABS( candidates(il)%x - current_v%x ) < .01 * dx ) THEN
1916	xs = NINT(current_v%x*ddx)-1
1917	xe = xs + 1
1918	!
1919	!-- Case 1: ys < ye, edge from south to north, building must be
1920	!-- exclusively in all grid cells left of the edge
1921	IF ( current_v%y < candidates(il)%y ) THEN
1922	ys = NINT(current_v%y*ddy)
1923	ye = NINT(candidates(il)%y*ddy)-1
1924	IF ( .NOT.( ALL( .NOT. BTEST( wall_flags_0(xs,ys:ye), 0))&
1925	.AND.( ALL( BTEST( wall_flags_0(xe,ys:ye), 0 ) ) )))&
1926	THEN
1927	CYCLE
1928	ENDIF
1929	!
1930	!-- Case 2: ys > ye, edge from north to south, building must be
1931	!-- exclusively in all grid cells right of the edge
1932	ELSEIF ( current_v%y > candidates(il)%y ) THEN
1933	ys = NINT(current_v%y*ddy)-1
1934	ye = NINT(candidates(il)%y*ddy)
1935	IF ( .NOT.( ALL( .NOT. BTEST( wall_flags_0(xe,ye:ys), 0))&
1936	.AND.( ALL( BTEST( wall_flags_0(xs,ye:ys), 0 ) ) )))&
1937	THEN
1938	CYCLE
1939	ENDIF
1940	ENDIF
1941	!
1942	!-- Horizontal connection
1943	ELSEIF ( ABS( candidates(il)%y - current_v%y ) < .01 * dy ) THEN
1944
1945	ys = NINT(current_v%y*ddy)-1
1946	ye = ys + 1
1947	!
1948	!-- Case 3: xs > xe, edge from right to left, building must be
1949	!-- exclusively in all grid cells south of the edge
1950	IF ( current_v%x > candidates(il)%x ) THEN
1951	xs = NINT(current_v%x*ddx)-1
1952	xe = NINT(candidates(il)%x*ddx)
1953	IF ( .NOT.( ALL( .NOT. BTEST( wall_flags_0(xe:xs,ys), 0))&
1954	.AND.( ALL( BTEST( wall_flags_0(xe:xs,ye), 0 ) ) )))&
1955	THEN
1956	CYCLE
1957	ENDIF
1958	!
1959	!-- Case 4: xs < xe, edge from left to right, building must be
1960	!-- exclusively in all grid cells north of the edge
1961	ELSEIF ( current_v%x < candidates(il)%x ) THEN
1962	xs = NINT(current_v%x*ddx)
1963	xe = NINT(candidates(il)%x*ddx)-1
1964	IF ( .NOT.( ALL( .NOT. BTEST( wall_flags_0(xs:xe,ye), 0))&
1965	.AND.( ALL( BTEST( wall_flags_0(xs:xe,ys), 0 ) ) )))&
1966	THEN
1967	CYCLE
1968	ENDIF
1969	ENDIF
1970	ENDIF
1971	!
1972	!-- After the tests, only two potential neighbors are possible. The
1973	!-- one found first will get id_neighbor1, the possible 2nd one will
1974	!-- get id_neighbor2
1975	IF ( id_neighbor1 == -999 ) THEN
1976	id_neighbor1 = candidate_id(il)
1977	ELSEIF ( id_neighbor1 /= -999 .AND. &
1978	( ( ABS( sorted_p(id_neighbor1)%x - candidates(il)%x ) &
1979	> .01 * dx ) .OR. &
1980	( ABS( sorted_p(id_neighbor1)%y - candidates(il)%y ) &
1981	> .01 * dy ) ) ) &
1982	THEN
1983	id_neighbor2 = candidate_id(il)
1984	ENDIF
1985	ENDDO
1986	!
1987	!-- If two potential neighbors were found, determine the one that is on
1988	!-- the right hand side of the line connecting the current and previous
1989	!-- vertex. It is the real neighbor.
1990	IF ( id_neighbor2 /= -999 .AND. nosv > 1 ) THEN
1991	IF ( is_right(sorted_p(nosv-1)%x,sorted_p(nosv-1)%y, &
1992	current_v%x,current_v%y, &
1993	sorted_p(id_neighbor1)%x,sorted_p(id_neighbor1)%y) )&
1994	THEN
1995	id_neighbor = id_neighbor1
1996	ELSEIF ( is_right(sorted_p(nosv-1)%x,sorted_p(nosv-1)%y, &
1997	current_v%x,current_v%y, &
1998	sorted_p(id_neighbor2)%x,sorted_p(id_neighbor2)%y) )&
1999	THEN
2000	id_neighbor = id_neighbor2
2001	ENDIF
2002	ELSE
2003	id_neighbor = id_neighbor1
2004	ENDIF
2005	!
2006	!-- Put the found neighbor at next index in sorted array and move the
2007	!-- unsorted vertices back one index. This way, only yet unsorted
2008	!-- vertices are eligible to be candidates during the next iteration.
2009	IF (id_neighbor /= nosv + 1 .AND. id_neighbor /= -999) THEN
2010	dummy_vertex = sorted_p(id_neighbor)
2011	sorted_p(nosv+2:id_neighbor) = sorted_p(nosv+1:id_neighbor-1)
2012	sorted_p(nosv+1) = dummy_vertex
2013	!
2014	!-- If no neighbor was found, sorting is done for this polygon
2015	ELSEIF ( id_neighbor == -999 ) THEN
2016	DEALLOCATE(candidates,candidate_id)
2017	EXIT
2018	ENDIF
2019	DEALLOCATE(candidates,candidate_id)
2020	ENDDO
2021	!
2022	!-- Sorting is done. Reduce size (which means get rid of vertices
2023	!-- that are not part of the outer hull of the building: holes)
2024	!-- of sorted polygon and put it back in polygon%vertices.
2025	!-- Also add first vertex to the end of polygon and last vertex
2026	!-- before the beginning of polygon.
2027	DEALLOCATE(polygon%vertices)
2028	ALLOCATE(polygon%vertices(0:nosv+1))
2029	polygon%vertices(1:nosv) = sorted_p(1:nosv)
2030	polygon%vertices(0) = sorted_p(nosv)
2031	polygon%vertices(nosv+1) = sorted_p(1)
2032	polygons(i_p)%nov = nosv
2033	nov = polygons(i_p)%nov
2034	DEALLOCATE(sorted_p)
2035	ENDIF
2036
2037	END SUBROUTINE sort_polygon
2038
2039	!------------------------------------------------------------------------------!
2040	! Description:
2041	! ------------
2042	!> Reduces the number of vertices in a polygon using the
2043	!> Douglas-Poiker-Algorithm (1973)
2044	!------------------------------------------------------------------------------!
2045	RECURSIVE SUBROUTINE simplify_polygon( id_s, id_e, tol )
2046
2047	IMPLICIT NONE
2048
2049	INTEGER(iwp) :: max_dist_ind !< Index of vertex with maximum distance
2050	INTEGER(iwp) :: il !< counter
2051	INTEGER(iwp) :: id_s !< End index in polygon
2052	INTEGER(iwp) :: id_e !< End index in polygon
2053
2054	REAL(wp) :: max_dist !< Maximum distance from line
2055	REAL(wp) :: dum_dist !< Distance from line: dummy
2056	REAL(wp) :: tol !< factor that determines how far a vertex can be from the polygon approximation so that the approximation is still accepted
2057
2058	max_dist = 0.
2059	max_dist_ind = -999999
2060	!
2061	!-- Find vertex with max distance to id_s and id_e
2062	DO il = id_s + 1, id_e -1
2063	dum_dist = dist_point_to_edge(polygon%vertices(id_s)%x, &
2064	polygon%vertices(id_s)%y, &
2065	polygon%vertices(id_e)%x, &
2066	polygon%vertices(id_e)%y, &
2067	polygon%vertices(il)%x, &
2068	polygon%vertices(il)%y)
2069	IF ( dum_dist > max_dist ) THEN
2070	max_dist = dum_dist
2071	max_dist_ind = il
2072	ENDIF
2073	ENDDO
2074
2075	IF ( max_dist > tol ) THEN
2076	CALL simplify_polygon( id_s, max_dist_ind, tol )
2077	CALL simplify_polygon( max_dist_ind, id_e, tol )
2078	ELSE
2079	polygon%vertices(id_s+1:id_e-1)%delete = .TRUE.
2080	ENDIF
2081
2082	END SUBROUTINE simplify_polygon
2083
2084	!------------------------------------------------------------------------------!
2085	! Description:
2086	! ------------
2087	!> Checks if a vertex of a polygon is inside another polygon and if so, deletes
2088	!> it. The check is done using the crossing number algorithm. If a straight
2089	!> ray starting at a point crosses the borders of one polygon an odd
2090	!> number of times, the point is inside that polygon.
2091	!> This algorithm detects buildings that are completely surrounded by
2092	!> another building. They can be deleted since they can never be navigated.
2093	!> TODO: Maybe add a flag to turn this off and on as it might not be needed.
2094	!> also, if the domain has buildings at all boundary points, there would
2095	!> only be one giant building and everything in it deleted. So nothing
2096	!> could be navigated. relevant?!
2097	!------------------------------------------------------------------------------!
2098	SUBROUTINE inside_other_polygon( i_p )
2099
2100	IMPLICIT NONE
2101
2102	LOGICAL :: exit_flag !< flag to exit loops if an odd crossing number was found for any of a polygons vertices
2103
2104	INTEGER(iwp) :: cn !< number of crossings
2105	INTEGER(iwp) :: i_p !< index of current polygon
2106	INTEGER(iwp) :: il !< index of tested polygon
2107	INTEGER(iwp) :: nov_test !< no. of vertices of test-polygon
2108	INTEGER(iwp) :: ref_vert !< vertex currently being tested if it is inside another polygon
2109	INTEGER(iwp) :: test_edge !< index of edge being tested
2110
2111	REAL(wp) :: px !< x-coord of the point at the crossing of the ray and the vertex
2112	REAL(wp) :: xe !< x-coordinate of end point of edge
2113	REAL(wp) :: xr !< x-coordinate of reference point
2114	REAL(wp) :: xs !< x-coordinate of start point of edge
2115	REAL(wp) :: ye !< y-coordinate of end point of edge
2116	REAL(wp) :: yr !< y-coordinate of reference point
2117	REAL(wp) :: ys !< y-coordinate of start point of edge
2118
2119	TYPE(polygon_type), POINTER :: test_pol !< Polygon to be tested
2120
2121	exit_flag = .FALSE.
2122	!
2123	!-- Loop over all polygons other than the one being tested
2124	DO il = 1, polygon_counter
2125	IF ( il == i_p ) CYCLE
2126	test_pol => polygons(il)
2127	nov_test = polygons(il)%nov
2128	!
2129	!-- Inclusion test is done for every vertex of the polygon
2130	DO ref_vert = 1, nov
2131	cn = 0
2132	xr = polygon%vertices(ref_vert)%x
2133	yr = polygon%vertices(ref_vert)%y
2134	!
2135	!-- All edges of the every polygon il is tested for ray crossing
2136	DO test_edge = 1, nov_test
2137
2138	!-- It is tested wether the current edge crosses a ray that extends
2139	!-- from the current point to the right indefinitely.
2140	!-- Check if start point of edge is lower than end point. If they
2141	!-- are the same, ignore, since horizontal edges are excluded
2142	IF ( test_pol%vertices(test_edge)%y < &
2143	test_pol%vertices(test_edge+1)%y ) &
2144	THEN
2145	xs = test_pol%vertices(test_edge)%x
2146	xe = test_pol%vertices(test_edge+1)%x
2147	ys = test_pol%vertices(test_edge)%y
2148	ye = test_pol%vertices(test_edge+1)%y
2149	ELSEIF ( test_pol%vertices(test_edge)%y > &
2150	test_pol%vertices(test_edge+1)%y ) &
2151	THEN
2152	xs = test_pol%vertices(test_edge+1)%x
2153	xe = test_pol%vertices(test_edge)%x
2154	ys = test_pol%vertices(test_edge+1)%y
2155	ye = test_pol%vertices(test_edge)%y
2156	ELSE
2157	CYCLE
2158	ENDIF
2159	!
2160	!-- Only such edges where the starting point of the edge is south of
2161	!-- (or equal to) the reference point and the end point is north of
2162	!-- it are relevant. Note: an edge includes its southern endpoint
2163	!-- and excludes its northern endpoint.
2164	IF ( .NOT. (ys <= yr .AND. ye > yr )) CYCLE
2165	!
2166	!-- Only edges that are crossed on the right side of the reference
2167	!-- point are relevant, those on the left are ignored
2168	IF ( xs <= xr .AND. xe <= xr ) CYCLE
2169	IF ( ( xs <= xr .AND. xe >= xr ) .OR. &
2170	( xs >= xr .AND. xe <= xr ) ) &
2171	THEN
2172	px = xe - (xe-xs)*(ye-yr)/(ye-ys)
2173	IF ( px <= xr ) CYCLE
2174	ENDIF
2175	!
2176	!-- If none of the previous if clauses were true, a crossing with
2177	!-- an eligible edge was found and the count increases
2178	cn = cn + 1
2179	ENDDO
2180	!
2181	!-- If the number of crossings is odd, the point is inside another
2182	!-- polyon. The polygon associated with the point will be deleted
2183	IF ( MOD(cn, 2) /= 0 ) THEN
2184	exit_flag = .TRUE.
2185	EXIT
2186	ENDIF
2187	ENDDO
2188	IF ( exit_flag ) EXIT
2189	ENDDO
2190	IF ( exit_flag ) polygon%vertices%delete = .TRUE.
2191
2192	END SUBROUTINE inside_other_polygon
2193
2194	!------------------------------------------------------------------------------!
2195	! Description:
2196	! ------------
2197	!> Deletes thoses vertices that are marked for deletion (%delete flag) and
2198	!> resizes the polygon
2199	!------------------------------------------------------------------------------!
2200	SUBROUTINE delete_extra_vertices (i_p)
2201
2202	IMPLICIT NONE
2203
2204	INTEGER(iwp) :: il !< local counter
2205	INTEGER(iwp) :: vcounter !< vertex counter
2206	INTEGER(iwp) :: i_p !< polygon ID
2207
2208	TYPE(vertex_type), DIMENSION(:), ALLOCATABLE :: dummy_pol !< Temporarily stores non-deleted vertices
2209
2210	ALLOCATE(dummy_pol(1:nov))
2211	vcounter = 0
2212	!
2213	!-- Check all vertices and only keep those not marked for deletion
2214	DO il = 1, nov
2215	IF ( .NOT. polygon%vertices(il)%delete ) THEN
2216	vcounter = vcounter + 1
2217	dummy_pol(vcounter) = polygon%vertices(il)
2218	ENDIF
2219	ENDDO
2220	!
2221	!-- Set new number of vertices in the polygon
2222	nov = vcounter
2223	polygons(i_p)%nov = nov
2224	!
2225	!-- Resize
2226	DEALLOCATE(polygon%vertices)
2227	ALLOCATE(polygon%vertices(0:nov+1))
2228	polygon%vertices(1:nov) = dummy_pol(1:nov)
2229	polygon%vertices(0) = polygon%vertices(nov)
2230	polygon%vertices(nov+1) = polygon%vertices(1)
2231	DEALLOCATE(dummy_pol)
2232
2233	END SUBROUTINE delete_extra_vertices
2234
2235	!------------------------------------------------------------------------------!
2236	! Description:
2237	! ------------
2238	!> Deletes polygons that contain no vertices (happens for those polygons that
2239	!> were entirely encompassed by another polygon)
2240	!------------------------------------------------------------------------------!
2241	SUBROUTINE delete_empty_polygons
2242
2243	IMPLICIT NONE
2244
2245	INTEGER(iwp) :: il !< local counter
2246	INTEGER(iwp) :: pc !< number of nonempty polygons
2247	INTEGER(iwp) :: sv !< size of vertex array
2248
2249	TYPE(polygon_type), DIMENSION(:), ALLOCATABLE :: dummy_polygons !< temporarily stores non-deletd polygons
2250
2251	pc = 0
2252	sv = 0
2253	ALLOCATE( dummy_polygons(1:polygon_counter) )
2254	!
2255	!-- Keep only those polygons that contain any vertices, skip the rest
2256	DO il = 1, polygon_counter
2257	IF ( polygons(il)%nov > 0 ) THEN
2258	pc = pc + 1
2259	sv = SIZE(polygons(il)%vertices)
2260	ALLOCATE(dummy_polygons(pc)%vertices(0:sv-1))
2261	dummy_polygons(pc) = polygons(il)
2262	ENDIF
2263	ENDDO
2264	polygon_counter = pc
2265	!
2266	!-- Resize polygon array
2267	DEALLOCATE(polygons)
2268	ALLOCATE(polygons(1:polygon_counter))
2269	DO il = 1, polygon_counter
2270	!
2271	!-- give each %vertices array the correct size and information
2272	sv = SIZE(dummy_polygons(il)%vertices)
2273	polygons(il)%nov = sv - 2
2274	ALLOCATE(polygons(il)%vertices(0:sv-1))
2275	polygons(il) = dummy_polygons(il)
2276	ENDDO
2277	DEALLOCATE(dummy_polygons)
2278
2279	END SUBROUTINE delete_empty_polygons
2280
2281	END MODULE polygon_creation
2282
2283	MODULE mesh_creation
2284
2285	USE kinds
2286
2287	USE mod_functions
2288
2289	USE variables
2290
2291	CONTAINS
2292
2293	!------------------------------------------------------------------------------!
2294	! Description:
2295	! ------------
2296	!> Creates the navigation mesh:
2297	!> 1) Finds eligible vertices (those that are locally convex)
2298	!> 2) Adds them to the mesh
2299	!> 3) Adds connections between mesh points if they are in line of sight
2300	!> of each other and the connecting line does not point into either of
2301	!> the originating polygons (this is known as a visibility graph)
2302	!------------------------------------------------------------------------------!
2303	SUBROUTINE create_nav_mesh
2304
2305	IMPLICIT NONE
2306
2307	LOGICAL :: add !< flag for second cycle of add loop
2308	LOGICAL :: intersection_found !< flag to indicate a found intersection
2309
2310	INTEGER(iwp) :: cmp !< counter: current mesh point
2311	INTEGER(iwp) :: il !< local counter
2312	INTEGER(iwp) :: jl !< local counter
2313	INTEGER(iwp) :: pid !< polygon id of current mesh point
2314	INTEGER(iwp) :: pid_t !< polygon id of tested mesh point
2315	INTEGER(iwp) :: pl !< polygon counter
2316	INTEGER(iwp) :: vid !< vertex id of current mesh point
2317	INTEGER(iwp) :: vid_t !< vertex id of tested mesh point
2318	INTEGER(iwp) :: vl !< vertex counter
2319
2320	REAL(wp) :: v1x !< x-coordinate of test vertex 1 for intersection test
2321	REAL(wp) :: v1y !< y-coordinate of test vertex 1 for intersection test
2322	REAL(wp) :: v2x !< x-coordinate of test vertex 2 for intersection test
2323	REAL(wp) :: v2y !< y-coordinate of test vertex 2 for intersection test
2324	REAL(wp) :: x !< x-coordinate of current mesh point
2325	REAL(wp) :: x_t !< x-coordinate of tested mesh point
2326	REAL(wp) :: y !< y-coordinate of current mesh point
2327	REAL(wp) :: y_t !< y-coordinate of tested mesh point
2328	REAL(wp) :: corner_x !< x-coordinate of shifted corner
2329	REAL(wp) :: corner_x_e !< x-coordinate of end of corner gate
2330	REAL(wp) :: corner_y !< y-coordinate of shifted corner
2331	REAL(wp) :: corner_y_e !< y-coordinate of end of corner gate
2332	REAL(wp) :: t_start !< CPU measure: start
2333	REAL(wp) :: t_inter !< CPU measure: output test time
2334	REAL(wp) :: t_inter1 !< CPU measure: output test time
2335	REAL(wp) :: t_end !< CPU measure: end
2336	REAL(wp) :: t_left !< CPU measure: estimate for time left
2337	REAL(wp) :: t_done !< CPU measure: elapsed time
2338	REAL(wp) :: percent_done !< CPU measure: proportion of mesh points checked
2339
2340	!
2341	!-- Add all convex vertices to the mesh.
2342	!-- DO loop will be executed twice. Once to count the mesh points to be
2343	!-- added and allocate the mesh point array, the second time (add == .TRUE.)
2344	!-- to fill the mesh point array.
2345	WRITE(*,'(X,A)') 'Adding polygon vertices to mesh ...'
2346	add = .FALSE.
2347	DO
2348	cmp = 0
2349	DO il = 1, polygon_counter
2350	polygon => polygons(il)
2351	nov = polygons(il)%nov
2352	DO jl = 1, nov
2353	!
2354	!-- In a polygon that is sorted counter-clockwise, if the next vertex
2355	!-- is left of the line connecting the previous and the current vertex,
2356	!-- the current vertex is locally convex.
2357	IF ( is_left(polygon%vertices(jl-1)%x,polygon%vertices(jl-1)%y, &
2358	polygon%vertices(jl)%x,polygon%vertices(jl)%y, &
2359	polygon%vertices(jl+1)%x,polygon%vertices(jl+1)%y) ) &
2360	THEN
2361
2362	corner_x = polygon%vertices(jl)%x
2363	corner_y = polygon%vertices(jl)%y
2364	!
2365	!-- Create end point for corner navigation
2366	IF ( add ) THEN
2367	CALL shift_corner_outward( &
2368	polygon%vertices(jl-1)%x, polygon%vertices(jl-1)%y,&
2369	polygon%vertices(jl+1)%x, polygon%vertices(jl+1)%y,&
2370	polygon%vertices(jl)%x, polygon%vertices(jl)%y, &
2371	corner_x_e, corner_y_e, 1._wp )
2372	ENDIF
2373	!
2374	!-- Disregard corners outside of the domain
2375	IF ( corner_x<=(nx+1)*dx .AND. corner_x>=0 .AND. &
2376	corner_y<=(ny+1)*dy .AND. corner_y>=0) &
2377	THEN
2378	cmp = cmp + 1
2379	IF ( add ) THEN
2380	CALL set_mesh_point( mesh(cmp), il, jl, &
2381	corner_x, corner_y, &
2382	corner_x_e, corner_y_e )
2383	ENDIF
2384	ENDIF
2385	ENDIF
2386	ENDDO
2387	ENDDO
2388	IF ( add ) EXIT
2389	add = .TRUE.
2390	ALLOCATE( mesh(1:cmp) )
2391	ENDDO
2392	WRITE(*,'(6X,A,X,I10,X,A,/)') 'Done. Added',cmp,'vertices to mesh.'
2393	WRITE(*,'(X,A)') 'Establishing connections in mesh ...'
2394	!
2395	!-- CPU measurement
2396	CALL CPU_TIME(t_start)
2397	CALL CPU_TIME(t_inter)
2398	DO il = 1, cmp
2399	!-- Output status of processing
2400	CALL CPU_TIME(t_inter1)
2401	IF ( t_inter1 - t_inter > 4. ) THEN
2402	t_done = (t_inter1-t_start)/60.
2403	percent_done = REAL(il)/cmp*100.
2404	t_left = t_done/percent_done*(100-percent_done)
2405	WRITE(*,'(3X,2(A,I8),A,F6.2,2(A,F7.1),A,I10)') &
2406	'Mesh point ',il,' of ' ,cmp, &
2407	': ' ,percent_done, &
2408	' % \|\| elapsed time : ' ,t_done, &
2409	' min \|\| ETA: ' ,t_left, &
2410	' min \|\| number of connections found: ',number_of_connections
2411	CALL CPU_TIME(t_inter)
2412	ENDIF
2413	x = mesh(il)%x
2414	y = mesh(il)%y
2415	pid = mesh(il)%polygon_id
2416	vid = mesh(il)%vertex_id
2417	DO jl = 1, cmp
2418	!
2419	!-- No mesh point can be connected to itself
2420	IF ( il == jl ) CYCLE
2421	x_t = mesh(jl)%x
2422	y_t = mesh(jl)%y
2423	pid_t = mesh(jl)%polygon_id
2424	vid_t = mesh(jl)%vertex_id
2425	!
2426	!-- Cycle, if a connection had already been established
2427	IF ( ANY(mesh(jl)%connected_vertices == il) ) CYCLE
2428	!
2429	!-- If the distance between two nodes is larger than 600 m,
2430	!-- no connection will be made since there will typically no be such
2431	!-- long, straight ways in a city that a pedestrian will walk
2432	IF ( SQRT((x_t-x)2 +(y_t-y)2) > 400. ) CYCLE
2433	!
2434	!-- If the connecting line between two mesh points points into either
2435	!-- or both of the corresponding polygons, no connection will be
2436	!-- established between the two points. This is the case if the
2437	!-- previous (next) vertex of the polygon is right of the connecting
2438	!-- line and the next (previous) vertex of the polygon is left of the
2439	!-- connecting line. This is checked for both polygons.
2440	IF ( ((is_left(x_t,y_t,x,y,polygons(pid)%vertices(vid-1)%x, &
2441	polygons(pid)%vertices(vid-1)%y) &
2442	.AND. is_right(x_t,y_t,x,y,polygons(pid)%vertices(vid+1)%x, &
2443	polygons(pid)%vertices(vid+1)%y) ) &
2444	.OR. (is_right(x_t,y_t,x,y,polygons(pid)%vertices(vid-1)%x, &
2445	polygons(pid)%vertices(vid-1)%y) &
2446	.AND. is_left(x_t,y_t,x,y,polygons(pid)%vertices(vid+1)%x, &
2447	polygons(pid)%vertices(vid+1)%y)) ) &
2448	.OR. ((is_left(x,y,x_t,y_t,polygons(pid_t)%vertices(vid_t-1)%x, &
2449	polygons(pid_t)%vertices(vid_t-1)%y) &
2450	.AND. is_right(x,y,x_t,y_t,polygons(pid_t)%vertices(vid_t+1)%x, &
2451	polygons(pid_t)%vertices(vid_t+1)%y) ) &
2452	.OR. (is_right(x,y,x_t,y_t,polygons(pid_t)%vertices(vid_t-1)%x, &
2453	polygons(pid_t)%vertices(vid_t-1)%y) &
2454	.AND. is_left(x,y,x_t,y_t,polygons(pid_t)%vertices(vid_t+1)%x, &
2455	polygons(pid_t)%vertices(vid_t+1)%y)) ) ) &
2456	THEN
2457	CYCLE
2458	ENDIF
2459	!
2460	!-- For each edge of each polygon, check if it intersects with the
2461	!-- potential connection. If so, no connection can be made
2462	!-- THIS IS THE BOTTLENECK OF THE PROGRAM
2463	intersection_found = .FALSE.
2464	DO pl = pid, polygon_counter
2465	DO vl = 1, polygons(pl)%nov
2466	v1x = polygons(pl)%vertices(vl)%x
2467	v1y = polygons(pl)%vertices(vl)%y
2468	v2x = polygons(pl)%vertices(vl+1)%x
2469	v2y = polygons(pl)%vertices(vl+1)%y
2470	intersection_found = intersect(x,y,x_t,y_t,v1x,v1y,v2x,v2y)
2471	IF ( intersection_found ) EXIT
2472	ENDDO
2473	IF ( intersection_found ) EXIT
2474	ENDDO
2475	IF ( intersection_found ) CYCLE
2476	DO pl = pid, 1, -1
2477	IF ( pl == pid ) CYCLE
2478	DO vl = 1, polygons(pl)%nov
2479	v1x = polygons(pl)%vertices(vl)%x
2480	v1y = polygons(pl)%vertices(vl)%y
2481	v2x = polygons(pl)%vertices(vl+1)%x
2482	v2y = polygons(pl)%vertices(vl+1)%y
2483	intersection_found = intersect(x,y,x_t,y_t,v1x,v1y,v2x,v2y)
2484	IF ( intersection_found ) EXIT
2485	ENDDO
2486	IF ( intersection_found ) EXIT
2487	ENDDO
2488	IF ( intersection_found ) CYCLE
2489	!
2490	!-- If neither of the above two test was true, a connection will be
2491	!-- established between the two mesh points.
2492	number_of_connections = number_of_connections + 1
2493	CALL add_connection(mesh(il),jl, mesh(jl))
2494	CALL add_connection(mesh(jl),il, mesh(il))
2495	ENDDO
2496	ENDDO
2497	!
2498	!-- Adapt connected_vertices arrays
2499	DO il = 1, cmp
2500	CALL reduce_connections(mesh(il))
2501	ENDDO
2502	CALL CPU_TIME(t_end)
2503	!
2504	!-- Output to terminal
2505	WRITE(*,'(6X,A,I10,A)') 'Done. Established ',number_of_connections, &
2506	' connections in mesh'
2507	WRITE(*,'(6X,A,F10.1,A)') 'Time needed for calculation: ', &
2508	t_end-t_start,' seconds'
2509
2510	END SUBROUTINE create_nav_mesh
2511
2512	!------------------------------------------------------------------------------!
2513	! Description:
2514	! ------------
2515	!> Initializes a point of the navigation mesh
2516	!------------------------------------------------------------------------------!
2517	SUBROUTINE set_mesh_point (in_mp,pid,vid,x,y,x_s,y_s)
2518
2519	IMPLICIT NONE
2520
2521	INTEGER(iwp) :: pid !< polygon ID
2522	INTEGER(iwp) :: vid !< vertex ID
2523
2524	REAL(wp) :: x !< x-value of mesh point for path calculation
2525	REAL(wp) :: x_s !< x-value shifted outward from corner
2526	REAL(wp) :: y !< y-value of mesh point for path calculation
2527	REAL(wp) :: y_s !< y-value shifted outward from corner
2528
2529	TYPE(mesh_point) :: in_mp !< mesh point to be created
2530
2531	in_mp%origin_id = -1
2532	in_mp%polygon_id = pid
2533	in_mp%vertex_id = vid
2534	in_mp%cost_so_far = 1.d12
2535	in_mp%x = x
2536	in_mp%y = y
2537	in_mp%x_s = x_s
2538	in_mp%y_s = y_s
2539	in_mp%noc = 0
2540
2541	ALLOCATE(in_mp%connected_vertices(1:100), &
2542	in_mp%distance_to_vertex(1:100))
2543
2544	in_mp%connected_vertices = -999
2545	in_mp%distance_to_vertex = -999.
2546
2547	END SUBROUTINE set_mesh_point
2548
2549	!------------------------------------------------------------------------------!
2550	! Description:
2551	! ------------
2552	!> Shifts a corner (middle one of three consecutive points a, b and p) outward
2553	!> by a given length along the angle bisector. Stores the result to res_x/res_y
2554	!------------------------------------------------------------------------------!
2555	SUBROUTINE shift_corner_outward ( a_x, a_y, b_x, b_y, p_x, p_y, res_x, &
2556	res_y, shift )
2557
2558	IMPLICIT NONE
2559
2560	REAL(wp) :: a_x !< x-value of point A
2561	REAL(wp) :: a_y !< y-value of point A
2562	REAL(wp) :: abs_ap !< distance from A to P
2563	REAL(wp) :: abs_bp !< distance from B to P
2564	REAL(wp) :: abs_co !< length of angle bisector
2565	REAL(wp) :: b_x !< x-value of point B
2566	REAL(wp) :: b_y !< y-value of point B
2567	REAL(wp) :: eap_x !< x-value of unit vector from A to P
2568	REAL(wp) :: eap_y !< y-value of unit vector from A to P
2569	REAL(wp) :: ebp_x !< x-value of unit vector from B to P
2570	REAL(wp) :: ebp_y !< y-value of unit vector from B to P
2571	REAL(wp) :: p_x !< x-value of point P
2572	REAL(wp) :: p_y !< y-value of point P
2573	REAL(wp) :: res_x !< x-value of result
2574	REAL(wp) :: res_y !< y-value of result
2575	REAL(wp) :: shift !< distance of shift in meters
2576
2577	!
2578	!-- Get unit vector from previous to current vertex
2579	eap_x = p_x - a_x
2580	eap_y = p_y - a_y
2581	abs_ap = SQRT(eap_x2+eap_y2)
2582	eap_x = eap_x/abs_ap
2583	eap_y = eap_y/abs_ap
2584	!
2585	!-- Get unit vector from next to current vertex
2586	ebp_x = p_x - b_x
2587	ebp_y = p_y - b_y
2588	abs_bp = SQRT(ebp_x2+ebp_y2)
2589	ebp_x = ebp_x/abs_bp
2590	ebp_y = ebp_y/abs_bp
2591	!
2592	!-- Add previous two vectors to get angle bisector of corner.
2593	!-- Then, set its length to shift and add to original vertex
2594	!-- vector to shift it outward
2595	res_x = eap_x + ebp_x
2596	res_y = eap_y + ebp_y
2597	abs_co = SQRT(res_x2+res_y2)
2598	res_x = shift*res_x/abs_co + p_x
2599	res_y = shift*res_y/abs_co + p_y
2600
2601	END SUBROUTINE shift_corner_outward
2602
2603	!------------------------------------------------------------------------------!
2604	! Description:
2605	! ------------
2606	!> Adds a connection between two points of the navigation mesh
2607	!> (one-way: in_mp1 to in_mp2)
2608	!------------------------------------------------------------------------------!
2609	SUBROUTINE add_connection (in_mp1,id2,in_mp2)
2610
2611	IMPLICIT NONE
2612
2613	LOGICAL :: connection_established !< Flag to indicate if connection has already been established
2614
2615	INTEGER(iwp) :: id2 !< ID of in_mp2
2616	INTEGER(iwp) :: il !< local counter
2617	INTEGER(iwp) :: noc1 !< number of connections in in_mp1
2618
2619	INTEGER, DIMENSION(:), ALLOCATABLE :: dum_cv !< dummy array for connected_vertices
2620
2621	REAL(wp) :: dist !< Distance between the two points
2622
2623	REAL(wp), DIMENSION(:), ALLOCATABLE :: dum_dtv
2624
2625	TYPE(mesh_point) :: in_mp1 !< mesh point that gets a new connection
2626	TYPE(mesh_point) :: in_mp2 !< mesh point in_mp1 will be connected to
2627
2628	connection_established = .FALSE.
2629	!
2630	!-- Check if connection has already been established
2631	noc1 = SIZE(in_mp1%connected_vertices)
2632	DO il = 1, in_mp1%noc
2633	IF ( in_mp1%connected_vertices(il) == id2 ) THEN
2634	connection_established = .TRUE.
2635	EXIT
2636	ENDIF
2637	ENDDO
2638
2639	IF ( .NOT. connection_established ) THEN
2640	!
2641	!-- Resize arrays, if necessary
2642	IF ( in_mp1%noc >= noc1 ) THEN
2643	ALLOCATE( dum_cv(1:noc1),dum_dtv(1:noc1) )
2644	dum_cv = in_mp1%connected_vertices
2645	dum_dtv = in_mp1%distance_to_vertex
2646	DEALLOCATE( in_mp1%connected_vertices, in_mp1%distance_to_vertex )
2647	ALLOCATE( in_mp1%connected_vertices(1:2*noc1), &
2648	in_mp1%distance_to_vertex(1:2*noc1) )
2649	in_mp1%connected_vertices = -999
2650	in_mp1%distance_to_vertex = -999.
2651	in_mp1%connected_vertices(1:noc1) = dum_cv
2652	in_mp1%distance_to_vertex(1:noc1) = dum_dtv
2653	ENDIF
2654
2655	!
2656	!-- Add connection
2657	in_mp1%noc = in_mp1%noc+1
2658	dist = SQRT( (in_mp1%x - in_mp2%x)2 + (in_mp1%y - in_mp2%y)2 )
2659	in_mp1%connected_vertices(in_mp1%noc) = id2
2660	in_mp1%distance_to_vertex(in_mp1%noc) = dist
2661	ENDIF
2662
2663	END SUBROUTINE add_connection
2664
2665	!------------------------------------------------------------------------------!
2666	! Description:
2667	! ------------
2668	!> Reduces the size of connection array to the amount of actual connections
2669	!> after all connetions were added
2670	!------------------------------------------------------------------------------!
2671	SUBROUTINE reduce_connections (in_mp)
2672
2673	IMPLICIT NONE
2674
2675	INTEGER(iwp) :: noc !< Number of connections
2676
2677	INTEGER, DIMENSION(:), ALLOCATABLE :: dum_cv !< dummy: connected_vertices
2678
2679	REAL(wp), DIMENSION(:), ALLOCATABLE :: dum_dtv !< dummy: distance_to_vertex
2680
2681	TYPE(mesh_point) :: in_mp !< Input mesh point
2682
2683	noc = in_mp%noc
2684	ALLOCATE( dum_cv(1:noc),dum_dtv(1:noc) )
2685	dum_cv = in_mp%connected_vertices(1:noc)
2686	dum_dtv = in_mp%distance_to_vertex(1:noc)
2687	DEALLOCATE( in_mp%connected_vertices, in_mp%distance_to_vertex )
2688	ALLOCATE( in_mp%connected_vertices(1:noc), &
2689	in_mp%distance_to_vertex(1:noc) )
2690	in_mp%connected_vertices(1:noc) = dum_cv(1:noc)
2691	in_mp%distance_to_vertex(1:noc) = dum_dtv(1:noc)
2692
2693	END SUBROUTINE reduce_connections
2694
2695	!------------------------------------------------------------------------------!
2696	! Description:
2697	! ------------
2698	!> Writes all NavMesh information into binary file and building data to ASCII
2699	!------------------------------------------------------------------------------!
2700	SUBROUTINE bin_out_mesh
2701
2702	IMPLICIT NONE
2703
2704	INTEGER(iwp) :: il !< local counter
2705	INTEGER(iwp) :: jl !< local counter
2706	INTEGER(iwp) :: size_of_mesh !< size of mesh
2707	INTEGER(iwp) :: size_of_pols !< size of polygon
2708
2709	WRITE(*,'(X,A)') 'Writing binary output data ...'
2710
2711	OPEN ( 14, FILE= TRIM(runname)//'_nav', FORM='UNFORMATTED', STATUS='replace' )
2712	!
2713	!-- Output of mesh data
2714	size_of_mesh = SIZE(mesh)
2715	WRITE(14) size_of_mesh
2716	DO il = 1, size_of_mesh
2717	WRITE(14) mesh(il)%polygon_id, mesh(il)%vertex_id, mesh(il)%noc, &
2718	mesh(il)%origin_id, mesh(il)%cost_so_far, mesh(il)%x, &
2719	mesh(il)%y, mesh(il)%x_s, mesh(il)%y_s
2720	DO jl = 1, mesh(il)%noc
2721	WRITE(14) mesh(il)%connected_vertices(jl), &
2722	mesh(il)%distance_to_vertex(jl)
2723	ENDDO
2724	ENDDO
2725	!
2726	!-- Output of building polygon data
2727	size_of_pols = SIZE(polygons)
2728	WRITE(14) size_of_pols
2729	DO il = 1, size_of_pols
2730	WRITE(14) polygons(il)%nov
2731	DO jl = 0, polygons(il)%nov+1
2732	WRITE(14) polygons(il)%vertices(jl)%delete, &
2733	polygons(il)%vertices(jl)%x, polygons(il)%vertices(jl)%y
2734	ENDDO
2735	ENDDO
2736	CLOSE(14)
2737	!
2738	!-- Output building data to ASCII file
2739	OPEN(UNIT=7,FILE='topo.txt',STATUS='replace',ACTION='write')
2740	DO i = 1, polygon_counter
2741	IF (polygons(i)%nov == 0) CYCLE
2742	DO j = 1, polygons(i)%nov
2743	WRITE(7,150) i,j,polygons(i)%vertices(j)%x, &
2744	polygons(i)%vertices(j)%y
2745	ENDDO
2746	ENDDO
2747	CLOSE(7)
2748
2749	WRITE(*,'(6X,A)') 'Done, tool terminating.', ' ', &
2750	'Before starting your PALM run, please check the', &
2751	'ASCII file topo.txt to see if you are satisfied', &
2752	'with the polygon representation of the building', &
2753	'data. If not, consider adjusting the parameter', &
2754	'tolerance_dp accordingly.', ' ', 'Bye, Bye!', ' '
2755	CALL CPU_TIME(finish)
2756	WRITE(*,'(X,A,F10.4,A)') 'Total runtime: ', finish-start, ' seconds'
2757
2758	150 FORMAT (2(I7,X),2(F9.2,X) )
2759
2760	END SUBROUTINE bin_out_mesh
2761
2762	END MODULE mesh_creation
2763
2764	PROGRAM nav_mesh
2765
2766	USE mesh_creation
2767	USE polygon_creation
2768	USE variables
2769	IMPLICIT NONE
2770
2771
2772	!
2773	!-- Start CPU mesurement
2774	CALL CPU_TIME(start)
2775	!
2776	!-- Initialization
2777	CALL init
2778
2779	WRITE(,) "Converting building data to polygons ..."
2780	!
2781	!-- Convert gridded building data to polygons
2782	CALL identify_polygons
2783	!
2784	!-- Find corners in topography and add them to polygons
2785	CALL identify_corners
2786	!
2787	!-- Sort polygons counter-clockwise, then simplify them
2788	DO i = 1, polygon_counter
2789	polygon => polygons(i)
2790	nov = polygons(i)%nov
2791	CALL sort_polygon(i)
2792	!
2793	!-- Simplify each polygon using douglas-peucker algorithm. If the number
2794	!-- of vertices would fall below 4 due to this procedure, the tolerance
2795	!-- for the algorithm is reduced and it is run again.
2796	DO i_sc = 0, 2
2797	CALL simplify_polygon(1,nov+1,tolerance_dp(i_sc))
2798	i_cn = 0
2799	DO j = 1, nov
2800	IF ( .NOT. polygon%vertices(j)%delete ) i_cn = i_cn + 1
2801	ENDDO
2802	IF ( i_cn > 3 ) THEN
2803	EXIT
2804	ELSE
2805	polygon%vertices(:)%delete = .FALSE.
2806	ENDIF
2807	ENDDO
2808	CALL delete_extra_vertices(i)
2809	ENDDO
2810	!
2811	!-- Remove buildings that are surrounded by another building
2812	IF ( .NOT. internal_buildings ) THEN
2813	DO i = 1, polygon_counter
2814	polygon => polygons(i)
2815	nov = polygons(i)%nov
2816	CALL inside_other_polygon(i)
2817	ENDDO
2818	ENDIF
2819	!
2820	!-- Delete vertices that are marked for deletion
2821	DO i = 1, polygon_counter
2822	polygon => polygons(i)
2823	nov = polygons(i)%nov
2824	CALL delete_extra_vertices(i)
2825	ENDDO
2826	!
2827	!-- Count number of vertices
2828	vertex_counter = 0
2829	DO i = 1, polygon_counter
2830	polygon => polygons(i)
2831	nov = polygons(i)%nov
2832	vertex_counter = vertex_counter + nov
2833	ENDDO
2834	!
2835	!-- Delete polygons with no vertices
2836	CALL delete_empty_polygons
2837	WRITE(*,'(2(6X,A,I10,X,A,/))') &
2838	'Done. Created a total of', polygon_counter, 'polygon(s)', &
2839	' with a total of', vertex_counter, 'vertices'
2840	!
2841	!-- Crate Navigation mesh from polygon data
2842	CALL create_nav_mesh
2843	!
2844	!-- Binary mesh output
2845	CALL bin_out_mesh
2846
2847	END PROGRAM nav_mesh

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