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source: palm/trunk/SOURCE/virtual_measurement_mod.f90 @ 3479

Last change on this file since 3479 was 3473, checked in by suehring, 6 years ago
Bugfix for previous commit
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1	!> @virtual_measurement_mod.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 2017 Leibniz Universitaet Hannover
18	!------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! -----------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: virtual_measurement_mod.f90 3473 2018-10-30 20:50:15Z gronemeier $
27	! Initial revision
28	!
29	! 3472 2018-10-30 20:43:50Z suehring
30	!
31	! Authors:
32	! --------
33	! @author Matthias Suehring
34	!
35	!
36	!
37	! Description:
38	! ------------
39	!> The module acts as an interface between 'real-world' observations and
40	!> model simulations. Virtual measurements will be taken in the model at the
41	!> coordinates representative for the 'real-world' measurement positions.
42	!> More precisely, coordinates and measured quanties will be read from a
43	!> NetCDF file which contains all required information. In the model,
44	!> the same quantities (as long as all the required components are switched-on)
45	!> will be sampled at the respective positions and output into an extra file,
46	!> which allows for straight-forward comparison of model results with
47	!> observations.
48	!------------------------------------------------------------------------------!
49	MODULE virtual_measurement_mod
50
51
52	USE arrays_3d, &
53	ONLY: q, pt, u, v, w, zu, zw
54
55	USE control_parameters, &
56	ONLY: dz, message_string, virtual_measurement
57
58	USE cpulog, &
59	ONLY: cpu_log, log_point
60
61	USE grid_variables, &
62	ONLY: dx, dy
63
64	USE indices, &
65	ONLY: nzb, nzt, nxl, nxr, nys, nyn
66
67	USE kinds
68
69
70	IMPLICIT NONE
71
72	TYPE virt_mea
73
74	CHARACTER(LEN=100) :: feature_type !< type of the measurement
75	CHARACTER(LEN=100) :: site !< name of the measurement site
76
77	CHARACTER(LEN=10), DIMENSION(:), ALLOCATABLE :: measured_vars_name !< name of the measured variables
78
79	INTEGER(iwp) :: ns !< total number of observation points for a site on subdomain, i.e. sum of all trajectories
80	INTEGER(iwp) :: ntraj !< number of trajectories of a measurement
81	INTEGER(iwp) :: nvar !< number of measured variables
82
83	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: dim_t !< number observations individual for each trajectory or station that are no _FillValues
84	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: ngp !< number of grid points where observations for a site took place,
85	!<individual for each trajectory or station that are no _FillValues
86
87	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: i !< grid index for measurement position in x-direction
88	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: j !< grid index for measurement position in y-direction
89	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: k !< grid index for measurement position in k-direction
90
91	LOGICAL :: trajectory = .FALSE. !< flag indicating that the observation is a mobile observation
92	LOGICAL :: timseries = .FALSE. !< flag indicating that the observation is a stationary point measurement
93	LOGICAL :: timseries_profile = .FALSE. !< flag indicating that the observation is a stationary profile measurement
94
95	REAL(wp) :: fill_eutm !< fill value for UTM coordinates in case of missing values
96	REAL(wp) :: fill_nutm !< fill value for UTM coordinates in case of missing values
97	REAL(wp) :: fill_zag !< fill value for heigth coordinates in case of missing values
98	REAL(wp) :: fillout = -999.9 !< fill value for output in case a observation is taken from inside a building
99	REAL(wp) :: origin_x_obs !< origin of the observation in UTM coordiates in x-direction
100	REAL(wp) :: origin_y_obs !< origin of the observation in UTM coordiates in y-direction
101
102	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: xmea !< measurement x-position in absolute UTM coordinates
103	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: ymea !< measurement y-position in absolute UTM coordinates
104	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: zmea !< measurement z-position in height above ground level
105
106	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: measured_vars !< measured variables
107
108	END TYPE virt_mea
109
110	CHARACTER(LEN=5) :: char_eutm = "E_UTM" !< dimension name for UTM coordinate easting
111	CHARACTER(LEN=11) :: char_feature = "featureType" !< attribute name for feature type
112	CHARACTER(LEN=10) :: char_fillvalue = "_FillValue" !< variable attribute name for _FillValue
113	CHARACTER(LEN=18) :: char_mv = "measured_variables" !< variable name for the array with the measured variable names
114	CHARACTER(LEN=5) :: char_nutm = "N_UTM" !< dimension name for UTM coordinate northing
115	CHARACTER(LEN=18) :: char_numstations = "number_of_stations" !< attribute name for number of stations
116	CHARACTER(LEN=8) :: char_origx = "origin_x" !< attribute name for station coordinate in x
117	CHARACTER(LEN=8) :: char_origy = "origin_y" !< attribute name for station coordinate in y
118	CHARACTER(LEN=4) :: char_site = "site" !< attribute name for site name
119	CHARACTER(LEN=19) :: char_zag = "height_above_ground" !< attribute name for height above ground variable
120	CHARACTER(LEN=10) :: type_ts = 'timeSeries' !< name of stationary point measurements
121	CHARACTER(LEN=10) :: type_traj = 'trajectory' !< name of line measurements
122	CHARACTER(LEN=17) :: type_tspr = 'timeSeriesProfile' !< name of stationary profile measurements
123
124	CHARACTER(LEN=10), DIMENSION(1:53), PARAMETER :: list_allowed_variables = & !< variables that can be sampled in PALM
125	(/ 'hfls ', & ! surface latent heat flux (W/m2)
126	'hfss ', & ! surface sensible heat flux (W/m2)
127	'hur ', & ! relative humidity (-)
128	'hus ', & ! specific humidity (g/kg)
129	'haa ', & ! absolute atmospheric humidity (kg/m3)
130	'mcpm1 ', & ! mass concentration of PM1 (kg/m3)
131	'mcpm2p5 ', & ! mass concentration of PM2.5 (kg/m3)
132	'mcpm10 ', & ! mass concentration of PM10 (kg/m3)
133	'mcpm10 ', & ! mass concentration of PM10 (kg/m3)
134	'mcco ', & ! mass concentration of CO (kg/m3)
135	'mcco2 ', & ! mass concentration of CO2 (kg/m3)
136	'mcbcda ', & ! mass concentration of black carbon paritcles (kg/m3)
137	'ncaa ', & ! number concentation of particles (1/m3)
138	'mfco2 ', & ! mole fraction of CO (mol/mol)
139	'mfco2 ', & ! mole fraction of CO2 (mol/mol)
140	'mfch4 ', & ! mole fraction of methane (mol/mol)
141	'mfnh3 ', & ! mole fraction of amonia (mol/mol)
142	'mfno ', & ! mole fraction of nitrogen monoxide (mol/mol)
143	'mfno2 ', & ! mole fraction of nitrogen dioxide (mol/mol)
144	'mfso2 ', & ! mole fraction of sulfur dioxide (mol/mol)
145	'mfh20 ', & ! mole fraction of water (mol/mol)
146	'plev ', & ! ? air pressure - hydrostaic + perturbation?
147	'rlds ', & ! surface downward longwave flux (W/m2)
148	'rlus ', & ! surface upward longwave flux (W/m2)
149	'rsds ', & ! surface downward shortwave flux (W/m2)
150	'rsus ', & ! surface upward shortwave flux (W/m2)
151	'ta ', & ! air temperature (degree C)
152	't_va ', & ! virtual accoustic temperature (K)
153	'theta ', & ! potential temperature (K)
154	'tro3 ', & ! mole fraction of ozone air (mol/mol)
155	'ts ', & ! scaling parameter of temperature (K)
156	'wspeed ', & ! ? wind speed - horizontal?
157	'wdir ', & ! wind direction
158	'us ', & ! friction velocity
159	'msoil ', & ! ? soil moisture - which depth?
160	'tsoil ', & ! ? soil temperature - which depth?
161	'u ', & ! u-component
162	'ua ', & ! eastward wind (is there any difference to u?)
163	'uw ', & ! ? vertical momentum flux - total ?
164	'utheta ', & ! ? horizontal heat flux - total ?
165	'uv ', & ! upward-northward horizontal momentum flux
166	'v ', & ! v-component
167	'va ', & ! northward wind (is there any difference to v?)
168	'vw ', & ! ? vertical momentum flux - total ?
169	'vtheta ', & ! ? horizontal heat flux - total ?
170	'w ', & ! w-component
171	'wtheta ', & ! ? vertical heat flux - total ?
172	'rld ', & ! downward longwave radiative flux (W/m2)
173	'rlu ', & ! upnward longwave radiative flux (W/m2)
174	'rsd ', & ! downward shortwave radiative flux (W/m2)
175	'rsu ', & ! upward shortwave radiative flux (W/m2)
176	'rsddif ', & ! downward shortwave diffuse radiative flux (W/m2)
177	'rnds ' & ! surface net downward radiative flux (W/m2)
178	/)
179
180	INTEGER(iwp) :: id_vm !< NetCDF file id for virtual measurements
181	INTEGER(iwp) :: nvm = 0 !< number of virtual measurements
182	INTEGER(iwp) :: observation_coverage_xy = 0 !< horizontal distance from the measurement point where observations should be taken in the surrounding
183	INTEGER(iwp) :: observation_coverage_z = 0 !< vertical distance from the measurement point where observations should be taken in the surrounding
184
185	LOGICAL :: use_virtual_measurement = .FALSE. !< Namelist parameter
186	LOGICAL :: global_attribute = .TRUE. !< flag indicating a global attribute
187
188	REAL(wp) :: vm_time_start = 0.0 !< time after virtual measurements should start
189
190
191	TYPE( virt_mea ), DIMENSION(:), ALLOCATABLE :: vmea !< virtual measurement data structure
192
193
194	INTERFACE vm_check_parameters
195	MODULE PROCEDURE vm_check_parameters
196	END INTERFACE vm_check_parameters
197
198	INTERFACE vm_init
199	MODULE PROCEDURE vm_init
200	END INTERFACE vm_init
201
202	INTERFACE vm_parin
203	MODULE PROCEDURE vm_parin
204	END INTERFACE vm_parin
205
206	INTERFACE vm_sampling
207	MODULE PROCEDURE vm_sampling
208	END INTERFACE vm_sampling
209
210	SAVE
211
212	PRIVATE
213
214	!
215	!-- Public interfaces
216	PUBLIC vm_check_parameters, vm_init, vm_parin, vm_sampling
217
218	!
219	!-- Public variables
220	PUBLIC vmea, vm_time_start
221
222	CONTAINS
223
224
225	!------------------------------------------------------------------------------!
226	! Description:
227	! ------------
228	!> Check parameters for virtual measurement module
229	!------------------------------------------------------------------------------!
230	SUBROUTINE vm_check_parameters
231
232	USE control_parameters, &
233	ONLY: message_string, virtual_measurement
234
235	USE netcdf_data_input_mod, &
236	ONLY: input_pids_static
237
238	IMPLICIT NONE
239
240	!
241	!-- In case virtual measurements are taken, a static input file is required.
242	!-- This is because UTM coordinates for the PALM domain origin are required
243	!-- for correct mapping of the measurements.
244	!-- ToDo: Revise this later and remove this requirement.
245	IF ( virtual_measurement .AND. .NOT. input_pids_static ) THEN
246	message_string = 'If virtual measurements are taken a static input ' // &
247	'file is mandatory.'
248	CALL message( 'vm_check_parameters', 'PA0000', 1, 2, 0, 6, 0 )
249	ENDIF
250
251	END SUBROUTINE vm_check_parameters
252
253	!------------------------------------------------------------------------------!
254	! Description:
255	! ------------
256	!> Read namelist for the virtual measurement module
257	!------------------------------------------------------------------------------!
258	SUBROUTINE vm_parin
259
260	CHARACTER (LEN=80) :: line !< dummy string that contains the current line of the parameter file
261
262	NAMELIST /virtual_measurement_parameters/ use_virtual_measurement, &
263	vm_time_start
264
265	line = ' '
266
267	!
268	!-- Try to find stg package
269	REWIND ( 11 )
270	line = ' '
271	DO WHILE ( INDEX( line, '&virtual_measurement_parameters' ) == 0 )
272	READ ( 11, '(A)', END=20 ) line
273	ENDDO
274	BACKSPACE ( 11 )
275
276	!
277	!-- Read namelist
278	READ ( 11, virtual_measurement_parameters, ERR = 10, END = 20 )
279
280	!
281	!-- Set flag that indicates that the virtual measurement module is switched on
282	IF ( use_virtual_measurement ) virtual_measurement = .TRUE.
283
284	GOTO 20
285
286	10 BACKSPACE( 11 )
287	READ( 11 , '(A)') line
288	CALL parin_fail_message( 'virtual_measurement_parameters', line )
289
290	20 CONTINUE
291
292	END SUBROUTINE vm_parin
293
294
295	!------------------------------------------------------------------------------!
296	! Description:
297	! ------------
298	!> Initialize virtual measurements: read coordiante arrays and measured
299	!> variables, set indicies indicating the measurement points, read further
300	!> attributes, etc..
301	!------------------------------------------------------------------------------!
302	SUBROUTINE vm_init
303
304	USE arrays_3d, &
305	ONLY: zu, zw
306
307	USE control_parameters, &
308	ONLY: message_string
309
310	USE grid_variables, &
311	ONLY: ddx, ddy, dx, dy
312
313	USE indices, &
314	ONLY: nxl, nxr, nyn, nys
315
316	USE netcdf_data_input_mod, &
317	ONLY: init_model, input_file_vm, &
318	netcdf_data_input_get_dimension_length, &
319	netcdf_data_input_att, netcdf_data_input_var
320
321	USE surface_mod, &
322	ONLY: get_topography_top_index_ji
323
324	IMPLICIT NONE
325
326	CHARACTER(LEN=5) :: dum !< dummy string indicate station id
327	CHARACTER(LEN=10), DIMENSION(50) :: measured_variables_file = '' !< array with all measured variables read from NetCDF
328	CHARACTER(LEN=10), DIMENSION(50) :: measured_variables = '' !< dummy array with all measured variables that are allowed
329
330	LOGICAL :: on_pe !< flag indicating that the respective measurement coordinate is on subdomain
331
332	INTEGER(iwp) :: dim_eutm !< dimension size of UTM easting coordinate
333	INTEGER(iwp) :: dim_nutm !< dimension size of UTM northing coordinate
334	INTEGER(iwp) :: dim_ntime !< dimension size of time coordinate
335	INTEGER(iwp) :: dim_zag !< dimension size of height coordinate
336	INTEGER(iwp) :: i !< grid index of virtual observation point in x-direction
337	INTEGER(iwp) :: icov !< index range where observations should be taken in x-direction
338	INTEGER(iwp) :: ii !< running index over all coordinate points of a measurement
339	INTEGER(iwp) :: i_prev !< grid index along x for UTM coordinate at previous observation time step
340	INTEGER(iwp) :: is !< grid index of real observation point of the respective station in x-direction
341	INTEGER(iwp) :: j !< grid index of observation point in x-direction
342	INTEGER(iwp) :: jcov !< index range where observations should be taken in y-direction
343	INTEGER(iwp) :: j_prev !< grid index along y for UTM coordinate at previous observation time step
344	INTEGER(iwp) :: js !< grid index of real observation point of the respective station in y-direction
345	INTEGER(iwp) :: k !< grid index of observation point in x-direction
346	INTEGER(iwp) :: kcov !< index range where observations should be taken in z-direction
347	INTEGER(iwp) :: ks !< grid index of real observation point of the respective station in z-direction
348	INTEGER(iwp) :: k_prev !< grid index along z for UTM coordinate at previous observation time step
349	INTEGER(iwp) :: ksurf !< topography top index
350	INTEGER(iwp) :: l !< running index over all stations
351	INTEGER(iwp) :: len_char !< character length of single measured variables without Null character
352	INTEGER(iwp) :: ll !< running index over all measured variables in file
353	INTEGER(iwp) :: lll !< running index over all allowed variables
354	INTEGER(iwp) :: n !< running index over trajectory coordinates
355	INTEGER(iwp) :: ns !< counter variable for number of observation points on subdomain
356	INTEGER(iwp) :: t !< running index over number of trajectories
357
358	REAL(wp) :: fill_eutm !< _FillValue for coordinate array E_UTM
359	REAL(wp) :: fill_nutm !< _FillValue for coordinate array N_UTM
360	REAL(wp) :: fill_zag !< _FillValue for height coordinate
361
362	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: e_utm !< easting UTM coordinate, temporary variable
363	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: n_utm !< northing UTM coordinate, temporary variable,
364	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: z_ag !< height coordinate relative to origin_z, temporary variable
365	!
366	!-- Obtain number of virtual measurement stations
367	CALL netcdf_data_input_att( nvm, char_numstations, id_vm, input_file_vm, &
368	global_attribute, 'open', '' )
369	!
370	!-- ALLOCATE data structure
371	ALLOCATE( vmea(1:nvm) )
372
373	! print*, "nvm", nvm
374	!
375	!-- Read station coordinates and further attributes.
376	!-- Note all coordinates are in UTM coordinates.
377	DO l = 1, nvm
378	!
379	!-- Determine suffix which contains the ID
380	IF( l < 10 ) THEN
381	WRITE( dum, '(I1)') l
382	ELSEIF( l < 100 ) THEN
383	WRITE( dum, '(I2)') l
384	ELSEIF( l < 1000 ) THEN
385	WRITE( dum, '(I3)') l
386	ELSEIF( l < 10000 ) THEN
387	WRITE( dum, '(I4)') l
388	ELSEIF( l < 100000 ) THEN
389	WRITE( dum, '(I5)') l
390	ENDIF
391
392	CALL netcdf_data_input_att( vmea(l)%origin_x_obs, char_origx &
393	// TRIM( dum ), id_vm, '', global_attribute,&
394	'', '' )
395	CALL netcdf_data_input_att( vmea(l)%origin_y_obs, char_origy &
396	// TRIM( dum ), id_vm, '', global_attribute,&
397	'', '' )
398	CALL netcdf_data_input_att( vmea(l)%site, char_site &
399	// TRIM( dum ), id_vm, '', global_attribute,&
400	'', '' )
401	CALL netcdf_data_input_att( vmea(l)%feature_type, char_feature &
402	// TRIM( dum ), id_vm, '', global_attribute,&
403	'', '' )
404
405	!
406	!--- Set logicals depending on the type of the measurement
407	IF ( INDEX( vmea(l)%feature_type, type_tspr ) /= 0 ) THEN
408	vmea(l)%timseries_profile = .TRUE.
409	ELSEIF ( INDEX( vmea(l)%feature_type, type_ts ) /= 0 ) THEN
410	vmea(l)%timseries = .TRUE.
411	ELSEIF ( INDEX( vmea(l)%feature_type, type_traj ) /= 0 ) THEN
412	vmea(l)%trajectory = .TRUE.
413	ELSE
414	!
415	!-- Give error message
416	message_string = 'Attribue featureType = ' // &
417	TRIM( vmea(l)%feature_type ) // &
418	' is not allowed.'
419	CALL message( 'vm_init', 'PA0000', 1, 2, 0, 6, 0 )
420	ENDIF
421	!
422	!-- Read string with all measured variables at this station
423	measured_variables_file = ''
424	CALL netcdf_data_input_var( measured_variables_file, &
425	char_mv // TRIM( dum ), id_vm )
426	!
427	!-- Count the number of measured variables which match with the variables
428	!-- which are allowed to be measured in PALM. Please note, for some
429	!-- NetCDF interal reasons characters end with a NULL, i.e. also empty
430	!-- characters contain a NULL. Therefore, check the strings for a Null to
431	!-- get the correct character length in order to compare them with the list
432	!-- of allowed variables.
433	vmea(l)%nvar = 0
434	DO ll = 1, SIZE( measured_variables_file )
435	IF ( measured_variables_file(ll)(1:1) /= CHAR(0) .AND. &
436	measured_variables_file(ll)(1:1) /= ' ') THEN
437	!
438	!-- Obtain character length of the character
439	len_char = 1
440	DO WHILE ( measured_variables_file(ll)(len_char:len_char) /= CHAR(0)&
441	.AND. measured_variables_file(ll)(len_char:len_char) /= ' ' )
442	len_char = len_char + 1
443	ENDDO
444	len_char = len_char - 1
445	!
446	!-- Now, compare the measured variable with the list of allowed
447	!-- variables.
448	DO lll= 1, SIZE( list_allowed_variables )
449	IF ( measured_variables_file(ll)(1:len_char) == &
450	TRIM( list_allowed_variables(lll) ) ) THEN
451	vmea(l)%nvar = vmea(l)%nvar + 1
452	measured_variables(vmea(l)%nvar) = &
453	measured_variables_file(ll)(1:len_char)
454	ENDIF
455	ENDDO
456	ENDIF
457	ENDDO
458	!
459	!-- Allocate array for the measured variables names for the station l.
460	ALLOCATE( vmea(l)%measured_vars_name(1:vmea(l)%nvar) )
461
462	DO ll = 1, vmea(l)%nvar
463	vmea(l)%measured_vars_name(ll) = TRIM( measured_variables(ll) )
464	ENDDO
465
466	! print*, "numvars", vmea(l)%nvar, vmea(l)%measured_vars_name(1:vmea(l)%nvar)
467	!
468	!-- For the actual measurement ID read the UTM coordinates. Based on these,
469	!-- define the index space on each subdomain where measurements should be
470	!-- taken. Note, the entire coordinate arrays will not be stored on data
471	!-- type as this would exceed memory requirements, particularly for
472	!-- trajectory measurements. If no variable will be virtually measured,
473	!-- skip the reading.
474	IF ( vmea(l)%nvar > 0 ) THEN
475	!
476	!-- For stationary measurements UTM coordinates are just one value and
477	!-- its dimension is "station", while for mobile measurements UTM
478	!-- coordinates are arrays. First, inquire dimension length for
479	!-- UTM coordinates.
480	IF ( vmea(l)%trajectory ) THEN
481	!
482	!-- For non-stationary measurements read the number of trajectories
483	CALL netcdf_data_input_get_dimension_length( id_vm, &
484	vmea(l)%ntraj, &
485	"traj" // &
486	TRIM( dum ) )
487	CALL netcdf_data_input_get_dimension_length( id_vm, dim_ntime, &
488	"ntime" // &
489	TRIM( dum ) )
490	!
491	!-- For stationary measurements the dimension for UTM coordinates is 1
492	ELSE
493	vmea(l)%ntraj = 1
494	dim_ntime = 1
495	ENDIF
496
497	!
498	!- Allocate array which defines individual time frame for each
499	!-- trajectory or station
500	ALLOCATE( vmea(l)%dim_t(1:vmea(l)%ntraj) )
501	ALLOCATE( vmea(l)%ngp(1:vmea(l)%ntraj) )
502	!
503	!-- Allocate temporary arrays for UTM and height coordinates. Note,
504	!-- on file UTM coordinates might be 1D or 2D variables
505	ALLOCATE( e_utm(1:vmea(l)%ntraj,1:dim_ntime) )
506	ALLOCATE( n_utm(1:vmea(l)%ntraj,1:dim_ntime) )
507	ALLOCATE( z_ag(1:vmea(l)%ntraj,1:dim_ntime) )
508	!
509	!-- Read _FillValue attributes
510	CALL netcdf_data_input_att( fill_eutm, char_fillvalue, &
511	id_vm, '', .NOT. global_attribute, '', &
512	char_eutm // TRIM( dum ) )
513	CALL netcdf_data_input_att( fill_nutm, char_fillvalue, &
514	id_vm, '', .NOT. global_attribute, '', &
515	char_nutm // TRIM( dum ) )
516	CALL netcdf_data_input_att( fill_zag, char_fillvalue, &
517	id_vm, '', .NOT. global_attribute, '', &
518	char_zag // TRIM( dum ) )
519	!
520	!-- Read UTM and height coordinates coordinates for all trajectories and
521	!-- times.
522	IF ( vmea(l)%trajectory ) THEN
523	CALL netcdf_data_input_var( e_utm, char_eutm // TRIM( dum ), id_vm, &
524	0, dim_ntime-1, 0, vmea(l)%ntraj-1 )
525	CALL netcdf_data_input_var( n_utm, char_nutm // TRIM( dum ), id_vm, &
526	0, dim_ntime-1, 0, vmea(l)%ntraj-1 )
527	CALL netcdf_data_input_var( z_ag, char_zag // TRIM( dum ), id_vm, &
528	0, dim_ntime-1, 0, vmea(l)%ntraj-1 )
529	ELSE
530	CALL netcdf_data_input_var( e_utm(1,:), char_eutm // TRIM( dum ), id_vm )
531	CALL netcdf_data_input_var( n_utm(1,:), char_nutm // TRIM( dum ), id_vm )
532	CALL netcdf_data_input_var( z_ag(1,:), char_zag // TRIM( dum ), id_vm )
533	ENDIF
534	!
535	!-- Based on UTM coordinates, check if the measurement station or parts
536	!-- of the trajectory is on subdomain. This case, setup grid index space
537	!-- sample these quantities.
538	ns = 0
539	DO t = 1, vmea(l)%ntraj
540	!
541	!-- Determine the individual time coordinate length for each station and
542	!-- trajectory. This is required as several stations and trajectories
543	!-- are merged into one file but they do not have the same number of
544	!-- points in time, hence, missing values may occur and cannot be
545	!-- processed further.
546	vmea(l)%dim_t(t) = 0
547	DO n = 1, dim_ntime
548	IF ( e_utm(t,n) /= fill_eutm .AND. &
549	n_utm(t,n) /= fill_nutm .AND. &
550	z_ag(t,n) /= fill_zag ) vmea(l)%dim_t(t) = n
551	ENDDO
552	!
553	!-- First, compute relative x- and y-coordinates with respect to the
554	!-- lower-left origin of the model domain, which is the difference
555	!-- betwen UTM coordinates.
556	! write(9,*) l, "before Eutm", e_utm(t,1:vmea(l)%dim_t(t)), "orig", init_model%origin_x
557	! write(9,*) l, "before Nutm", n_utm(t,1:vmea(l)%dim_t(t)), "orig", init_model%origin_y
558
559	e_utm(t,1:vmea(l)%dim_t(t)) = e_utm(t,1:vmea(l)%dim_t(t)) &
560	- init_model%origin_x
561	n_utm(t,1:vmea(l)%dim_t(t)) = n_utm(t,1:vmea(l)%dim_t(t)) &
562	- init_model%origin_y
563	! write(9,*) l, "Eutm", e_utm(t,1:vmea(l)%dim_t(t))
564	! write(9,*) l, "Nutm", n_utm(t,1:vmea(l)%dim_t(t))
565	! write(9,*)
566	!
567	!-- Compute grid indices relative to origin and check if these are
568	!-- on the subdomain. Note, virtual measurements will be taken also
569	!-- at grid points surrounding the station, hence, check also for
570	!-- these grid points.
571	vmea(l)%ngp(t) = 0
572	k_prev = -999
573	j_prev = -999
574	i_prev = -999
575	DO n = 1, vmea(l)%dim_t(t)
576	is = INT( ( e_utm(t,n) + 0.5_wp * dx ) * ddx, KIND = iwp )
577	js = INT( ( n_utm(t,n) + 0.5_wp * dy ) * ddy, KIND = iwp )
578	!
579	!-- Is the observation point on subdomain?
580	on_pe = ( is >= nxl .AND. is <= nxr .AND. &
581	js >= nys .AND. js <= nyn )
582	!
583	!-- If the measurement is on subdomain, determine vertical index
584	!-- which refers to the observation height above ground level.
585	ks = k_prev
586	IF ( on_pe ) THEN
587	! write(9,*) " I am onpe"
588	ksurf = get_topography_top_index_ji( js, is, 's' )
589	ks = MINLOC( ABS( zu - zw(ksurf) - z_ag(t,n) ), DIM = 1 ) - 1
590	ENDIF
591	!
592	!-- Count the number of observation points in index space on
593	!-- subdomain. Only increment if grid indices are different from
594	!-- the previous one.
595	IF ( on_pe .AND. is /= i_prev .AND. js /= j_prev .AND. &
596	ks /= k_prev ) THEN
597	ns = ns + 1
598	vmea(l)%ngp(t) = vmea(l)%ngp(t) + 1
599	ENDIF
600
601	!-- Store arrays for next iteration - avoid double counting
602	i_prev = is
603	j_prev = js
604	k_prev = ks
605	ENDDO
606
607	ENDDO
608
609	!
610	!-- Store number of observation points on subdomain and allocate index
611	!-- arrays.
612	vmea(l)%ns = ns
613
614	ALLOCATE( vmea(l)%i(1:vmea(l)%ns) )
615	ALLOCATE( vmea(l)%j(1:vmea(l)%ns) )
616	ALLOCATE( vmea(l)%k(1:vmea(l)%ns) )
617
618	! print*, "Num ns: ", vmea(l)%ns, "per traj", vmea(l)%ngp(:)
619	!
620	!-- Repeat the prior loop and save the grid indices relevant for
621	!-- sampling.
622	ns = 0
623	DO t = 1, vmea(l)%ntraj
624	!
625	!-- Compute grid indices relative to origin and check if these are
626	!-- on the subdomain. Note, virtual measurements will be taken also
627	!-- at grid points surrounding the station, hence, check also for
628	!-- these grid points.
629	k_prev = -999
630	j_prev = -999
631	i_prev = -999
632	DO n = 1, vmea(l)%dim_t(t)
633	is = INT( ( e_utm(t,n) + 0.5_wp * dx ) * ddx, KIND = iwp )
634	js = INT( ( n_utm(t,n) + 0.5_wp * dy ) * ddy, KIND = iwp )
635	!
636	!-- Is the observation point on subdomain?
637	on_pe = ( is >= nxl .AND. is <= nxr .AND. &
638	js >= nys .AND. js <= nyn )
639	!
640	!-- If the measurement is on subdomain, determine vertical index
641	!-- which refers to the observation height above ground level.
642	ks = k_prev
643	IF ( on_pe ) THEN
644	ksurf = get_topography_top_index_ji( js, is, 's' )
645	ks = MINLOC( ABS( zu - zw(ksurf) - z_ag(t,n) ), DIM = 1 ) - 1
646	ENDIF
647	!
648	!-- Count the number of observation points in index space on
649	!-- subdomain. Only increment if grid indices are different from
650	!-- the previous one.
651	IF ( on_pe .AND. is /= i_prev .AND. js /= j_prev .AND. &
652	ks /= k_prev ) THEN
653	ns = ns + 1
654	vmea(l)%i(ns) = is
655	vmea(l)%j(ns) = js
656	vmea(l)%k(ns) = ks
657	! write(9,*) TRIM( vmea(l)%feature_type), l, "ns", ns, "ijk", vmea(l)%i(ns), vmea(l)%j(ns), vmea(l)%k(ns)
658	ENDIF
659	!
660	!-- Store arrays for next iteration - avoid double counting
661	i_prev = is
662	j_prev = js
663	k_prev = ks
664	ENDDO
665
666	ENDDO
667	!
668	!-- Allocate array to save the sampled values.
669	!-- Todo: Is it better to allocate for all variables at a station
670	!-- and store all the values before writing, or sample the variables
671	!-- directly in the data output?
672	ALLOCATE( vmea(l)%measured_vars(1:vmea(l)%nvar,1:vmea(l)%ns) )
673	!
674	!-- Initialize with _FillValue
675	vmea(l)%measured_vars(1:vmea(l)%nvar,1:vmea(l)%ns) = vmea(l)%fillout
676	!
677	!-- Deallocate temporary coordinate arrays
678	IF ( ALLOCATED( e_utm ) ) DEALLOCATE( e_utm )
679	IF ( ALLOCATED( n_utm ) ) DEALLOCATE( n_utm )
680	IF ( ALLOCATED( z_ag ) ) DEALLOCATE( z_ag )
681	ENDIF
682	ENDDO
683	flush(9)
684
685	!
686	!-- Close input file for virtual measurements. Therefore, just call
687	!-- the read attribute routine with the "close" option.
688	CALL netcdf_data_input_att( nvm, char_numstations, id_vm, '', &
689	global_attribute, 'close', '' )
690	END SUBROUTINE vm_init
691
692
693	!------------------------------------------------------------------------------!
694	! Description:
695	! ------------
696	!> Sampling of the actual quantities along the observation coordinates
697	!------------------------------------------------------------------------------!
698	SUBROUTINE vm_sampling
699
700	USE arrays_3d !, &
701	! ONLY: pt
702
703	USE surface_mod
704
705	IMPLICIT NONE
706
707	CHARACTER(LEN=10) :: trimvar !< dummy for the measured variable name
708
709	INTEGER(iwp) :: l !<
710	INTEGER(iwp) :: m !<
711	INTEGER(iwp) :: var !<
712
713	INTEGER(iwp) :: mm, j, i
714
715	! write(9,*) "sampling"
716	! flush(9)
717	!
718	!-- Loop over all stations. For each possible variable loop over all
719	!-- observation points
720	DO l = 1, nvm
721	!
722	!-- Loop over all measured variables. Please note, for the moment
723	!-- the same indices for scalar and velocity components are used.
724	!-- ToDo: Revise this later.
725	! DO m = 1, vmea(l)%ns
726	! j = vmea(l)%j(m)
727	! i = vmea(l)%i(m)
728	!
729	! IF ( i >= nxl .AND. i <= nxr .AND. &
730	! j >= nys .AND. j <= nyn ) THEN
731	! IF ( surf_def_h(0)%start_index(j,i) <= &
732	! surf_def_h(0)%end_index(j,i) ) THEN
733	!
734	! write(9,*) "sampled"
735	! flush(9)
736	! mm = surf_def_h(0)%end_index(j,i)
737	!
738	! surf_def_h(0)%pt_surface(mm) = -99.0
739	! ENDIF
740	! ENDIF
741	! ENDDO
742	! DO var = 1, vmea(l)%nvar
743	! trimvar = TRIM( vmea(l)%measured_vars_name(var) )
744	!
745	! IF ( TRIM( trimvar ) == 'theta' ) THEN
746	! DO m = 1, vmea(l)%ns
747	! vmea(l)%measured_vars(var,m) = pt(vmea(l)%k(m),vmea(l)%j(m),vmea(l)%i(m))
748	! ENDDO
749	! ENDIF
750	! IF ( TRIM( trimvar ) == 'w' ) THEN
751	! DO m = 1, vmea(l)%ns
752	! vmea(l)%measured_vars(var,m) = w(vmea(l)%k(m),vmea(l)%j(m),vmea(l)%i(m))
753	! ENDDO
754	! ENDIF
755	! IF ( TRIM( trimvar ) == 'v' ) THEN
756	! DO m = 1, vmea(l)%ns
757	! vmea(l)%measured_vars(var,m) = v(vmea(l)%k(m),vmea(l)%j(m),vmea(l)%i(m))
758	! ENDDO
759	! ENDIF
760	! IF ( TRIM( trimvar ) == 'u' ) THEN
761	! DO m = 1, vmea(l)%ns
762	! vmea(l)%measured_vars(var,m) = u(vmea(l)%k(m),vmea(l)%j(m),vmea(l)%i(m))
763	! ENDDO
764	! ENDIF
765	! ENDDO
766
767	ENDDO
768
769	END SUBROUTINE vm_sampling
770
771
772	END MODULE virtual_measurement_mod

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