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source: palm/trunk/SOURCE/virtual_measurement_mod.f90 @ 3499

Last change on this file since 3499 was 3494, checked in by suehring, 6 years ago
Surface output revised and some bugs are fixed + new post-processing tool to convert binary surface output to Paraview readable VTK files
Property svn:executable set to ``* Property svn:keywords set to `Id`
File size: 35.3 KB

Rev	Line
[3471]	1	!> @virtual_measurement_mod.f90
[3434]	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	!
[3473]	23	!
[3434]	24	! Former revisions:
	25	! -----------------
[3472]	26	! $Id: virtual_measurement_mod.f90 3494 2018-11-06 14:51:27Z suehring $
[3494]	27	! Bugfixing
	28	!
	29	! 3473 2018-10-30 20:50:15Z suehring
[3473]	30	! Initial revision
	31	!
	32	! 3472 2018-10-30 20:43:50Z suehring
[3434]	33	!
	34	! Authors:
	35	! --------
[3494]	36	! @author Matthias Suehring and Klaus Ketelsen
[3434]	37	!
	38	!
	39	!
	40	! Description:
	41	! ------------
[3471]	42	!> The module acts as an interface between 'real-world' observations and
	43	!> model simulations. Virtual measurements will be taken in the model at the
	44	!> coordinates representative for the 'real-world' measurement positions.
	45	!> More precisely, coordinates and measured quanties will be read from a
	46	!> NetCDF file which contains all required information. In the model,
	47	!> the same quantities (as long as all the required components are switched-on)
	48	!> will be sampled at the respective positions and output into an extra file,
	49	!> which allows for straight-forward comparison of model results with
	50	!> observations.
[3434]	51	!------------------------------------------------------------------------------!
[3471]	52	MODULE virtual_measurement_mod
[3434]	53
	54
	55	USE arrays_3d, &
	56	ONLY: q, pt, u, v, w, zu, zw
	57
	58	USE control_parameters, &
	59	ONLY: dz, message_string, virtual_measurement
	60
	61	USE cpulog, &
	62	ONLY: cpu_log, log_point
	63
	64	USE grid_variables, &
	65	ONLY: dx, dy
	66
	67	USE indices, &
	68	ONLY: nzb, nzt, nxl, nxr, nys, nyn
	69
	70	USE kinds
	71
	72
	73	IMPLICIT NONE
	74
	75	TYPE virt_mea
	76
	77	CHARACTER(LEN=100) :: feature_type !< type of the measurement
	78	CHARACTER(LEN=100) :: site !< name of the measurement site
	79
	80	CHARACTER(LEN=10), DIMENSION(:), ALLOCATABLE :: measured_vars_name !< name of the measured variables
	81
	82	INTEGER(iwp) :: ns !< total number of observation points for a site on subdomain, i.e. sum of all trajectories
	83	INTEGER(iwp) :: ntraj !< number of trajectories of a measurement
	84	INTEGER(iwp) :: nvar !< number of measured variables
	85
	86	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: dim_t !< number observations individual for each trajectory or station that are no _FillValues
	87	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: ngp !< number of grid points where observations for a site took place,
	88	!<individual for each trajectory or station that are no _FillValues
	89
	90	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: i !< grid index for measurement position in x-direction
	91	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: j !< grid index for measurement position in y-direction
	92	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: k !< grid index for measurement position in k-direction
	93
	94	LOGICAL :: trajectory = .FALSE. !< flag indicating that the observation is a mobile observation
	95	LOGICAL :: timseries = .FALSE. !< flag indicating that the observation is a stationary point measurement
	96	LOGICAL :: timseries_profile = .FALSE. !< flag indicating that the observation is a stationary profile measurement
	97
	98	REAL(wp) :: fill_eutm !< fill value for UTM coordinates in case of missing values
	99	REAL(wp) :: fill_nutm !< fill value for UTM coordinates in case of missing values
	100	REAL(wp) :: fill_zag !< fill value for heigth coordinates in case of missing values
	101	REAL(wp) :: fillout = -999.9 !< fill value for output in case a observation is taken from inside a building
	102	REAL(wp) :: origin_x_obs !< origin of the observation in UTM coordiates in x-direction
	103	REAL(wp) :: origin_y_obs !< origin of the observation in UTM coordiates in y-direction
	104
	105	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: xmea !< measurement x-position in absolute UTM coordinates
	106	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: ymea !< measurement y-position in absolute UTM coordinates
	107	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: zmea !< measurement z-position in height above ground level
	108
	109	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: measured_vars !< measured variables
	110
	111	END TYPE virt_mea
	112
	113	CHARACTER(LEN=5) :: char_eutm = "E_UTM" !< dimension name for UTM coordinate easting
	114	CHARACTER(LEN=11) :: char_feature = "featureType" !< attribute name for feature type
	115	CHARACTER(LEN=10) :: char_fillvalue = "_FillValue" !< variable attribute name for _FillValue
	116	CHARACTER(LEN=18) :: char_mv = "measured_variables" !< variable name for the array with the measured variable names
	117	CHARACTER(LEN=5) :: char_nutm = "N_UTM" !< dimension name for UTM coordinate northing
	118	CHARACTER(LEN=18) :: char_numstations = "number_of_stations" !< attribute name for number of stations
	119	CHARACTER(LEN=8) :: char_origx = "origin_x" !< attribute name for station coordinate in x
	120	CHARACTER(LEN=8) :: char_origy = "origin_y" !< attribute name for station coordinate in y
	121	CHARACTER(LEN=4) :: char_site = "site" !< attribute name for site name
	122	CHARACTER(LEN=19) :: char_zag = "height_above_ground" !< attribute name for height above ground variable
	123	CHARACTER(LEN=10) :: type_ts = 'timeSeries' !< name of stationary point measurements
	124	CHARACTER(LEN=10) :: type_traj = 'trajectory' !< name of line measurements
	125	CHARACTER(LEN=17) :: type_tspr = 'timeSeriesProfile' !< name of stationary profile measurements
	126
[3471]	127	CHARACTER(LEN=10), DIMENSION(1:53), PARAMETER :: list_allowed_variables = & !< variables that can be sampled in PALM
	128	(/ 'hfls ', & ! surface latent heat flux (W/m2)
	129	'hfss ', & ! surface sensible heat flux (W/m2)
	130	'hur ', & ! relative humidity (-)
	131	'hus ', & ! specific humidity (g/kg)
	132	'haa ', & ! absolute atmospheric humidity (kg/m3)
	133	'mcpm1 ', & ! mass concentration of PM1 (kg/m3)
	134	'mcpm2p5 ', & ! mass concentration of PM2.5 (kg/m3)
	135	'mcpm10 ', & ! mass concentration of PM10 (kg/m3)
	136	'mcpm10 ', & ! mass concentration of PM10 (kg/m3)
	137	'mcco ', & ! mass concentration of CO (kg/m3)
	138	'mcco2 ', & ! mass concentration of CO2 (kg/m3)
	139	'mcbcda ', & ! mass concentration of black carbon paritcles (kg/m3)
	140	'ncaa ', & ! number concentation of particles (1/m3)
	141	'mfco2 ', & ! mole fraction of CO (mol/mol)
	142	'mfco2 ', & ! mole fraction of CO2 (mol/mol)
	143	'mfch4 ', & ! mole fraction of methane (mol/mol)
	144	'mfnh3 ', & ! mole fraction of amonia (mol/mol)
	145	'mfno ', & ! mole fraction of nitrogen monoxide (mol/mol)
	146	'mfno2 ', & ! mole fraction of nitrogen dioxide (mol/mol)
	147	'mfso2 ', & ! mole fraction of sulfur dioxide (mol/mol)
	148	'mfh20 ', & ! mole fraction of water (mol/mol)
	149	'plev ', & ! ? air pressure - hydrostaic + perturbation?
	150	'rlds ', & ! surface downward longwave flux (W/m2)
	151	'rlus ', & ! surface upward longwave flux (W/m2)
	152	'rsds ', & ! surface downward shortwave flux (W/m2)
	153	'rsus ', & ! surface upward shortwave flux (W/m2)
	154	'ta ', & ! air temperature (degree C)
	155	't_va ', & ! virtual accoustic temperature (K)
	156	'theta ', & ! potential temperature (K)
	157	'tro3 ', & ! mole fraction of ozone air (mol/mol)
	158	'ts ', & ! scaling parameter of temperature (K)
	159	'wspeed ', & ! ? wind speed - horizontal?
	160	'wdir ', & ! wind direction
	161	'us ', & ! friction velocity
	162	'msoil ', & ! ? soil moisture - which depth?
	163	'tsoil ', & ! ? soil temperature - which depth?
	164	'u ', & ! u-component
	165	'ua ', & ! eastward wind (is there any difference to u?)
	166	'uw ', & ! ? vertical momentum flux - total ?
	167	'utheta ', & ! ? horizontal heat flux - total ?
	168	'uv ', & ! upward-northward horizontal momentum flux
	169	'v ', & ! v-component
	170	'va ', & ! northward wind (is there any difference to v?)
	171	'vw ', & ! ? vertical momentum flux - total ?
	172	'vtheta ', & ! ? horizontal heat flux - total ?
	173	'w ', & ! w-component
	174	'wtheta ', & ! ? vertical heat flux - total ?
	175	'rld ', & ! downward longwave radiative flux (W/m2)
	176	'rlu ', & ! upnward longwave radiative flux (W/m2)
	177	'rsd ', & ! downward shortwave radiative flux (W/m2)
	178	'rsu ', & ! upward shortwave radiative flux (W/m2)
	179	'rsddif ', & ! downward shortwave diffuse radiative flux (W/m2)
	180	'rnds ' & ! surface net downward radiative flux (W/m2)
	181	/)
[3434]	182
	183	INTEGER(iwp) :: id_vm !< NetCDF file id for virtual measurements
	184	INTEGER(iwp) :: nvm = 0 !< number of virtual measurements
	185	INTEGER(iwp) :: observation_coverage_xy = 0 !< horizontal distance from the measurement point where observations should be taken in the surrounding
	186	INTEGER(iwp) :: observation_coverage_z = 0 !< vertical distance from the measurement point where observations should be taken in the surrounding
	187
	188	LOGICAL :: use_virtual_measurement = .FALSE. !< Namelist parameter
	189	LOGICAL :: global_attribute = .TRUE. !< flag indicating a global attribute
	190
	191	REAL(wp) :: vm_time_start = 0.0 !< time after virtual measurements should start
	192
	193
	194	TYPE( virt_mea ), DIMENSION(:), ALLOCATABLE :: vmea !< virtual measurement data structure
	195
	196
	197	INTERFACE vm_check_parameters
	198	MODULE PROCEDURE vm_check_parameters
	199	END INTERFACE vm_check_parameters
	200
	201	INTERFACE vm_init
	202	MODULE PROCEDURE vm_init
	203	END INTERFACE vm_init
	204
	205	INTERFACE vm_parin
	206	MODULE PROCEDURE vm_parin
	207	END INTERFACE vm_parin
	208
	209	INTERFACE vm_sampling
	210	MODULE PROCEDURE vm_sampling
	211	END INTERFACE vm_sampling
	212
	213	SAVE
	214
	215	PRIVATE
	216
	217	!
	218	!-- Public interfaces
	219	PUBLIC vm_check_parameters, vm_init, vm_parin, vm_sampling
	220
	221	!
	222	!-- Public variables
	223	PUBLIC vmea, vm_time_start
	224
	225	CONTAINS
	226
	227
	228	!------------------------------------------------------------------------------!
	229	! Description:
	230	! ------------
[3471]	231	!> Check parameters for virtual measurement module
[3434]	232	!------------------------------------------------------------------------------!
	233	SUBROUTINE vm_check_parameters
	234
	235	USE control_parameters, &
	236	ONLY: message_string, virtual_measurement
	237
	238	USE netcdf_data_input_mod, &
	239	ONLY: input_pids_static
	240
	241	IMPLICIT NONE
	242
	243	!
	244	!-- In case virtual measurements are taken, a static input file is required.
	245	!-- This is because UTM coordinates for the PALM domain origin are required
	246	!-- for correct mapping of the measurements.
	247	!-- ToDo: Revise this later and remove this requirement.
	248	IF ( virtual_measurement .AND. .NOT. input_pids_static ) THEN
	249	message_string = 'If virtual measurements are taken a static input ' // &
	250	'file is mandatory.'
	251	CALL message( 'vm_check_parameters', 'PA0000', 1, 2, 0, 6, 0 )
	252	ENDIF
	253
	254	END SUBROUTINE vm_check_parameters
	255
	256	!------------------------------------------------------------------------------!
	257	! Description:
	258	! ------------
[3471]	259	!> Read namelist for the virtual measurement module
[3434]	260	!------------------------------------------------------------------------------!
	261	SUBROUTINE vm_parin
	262
	263	CHARACTER (LEN=80) :: line !< dummy string that contains the current line of the parameter file
	264
	265	NAMELIST /virtual_measurement_parameters/ use_virtual_measurement, &
	266	vm_time_start
	267
	268	line = ' '
	269
	270	!
	271	!-- Try to find stg package
	272	REWIND ( 11 )
	273	line = ' '
	274	DO WHILE ( INDEX( line, '&virtual_measurement_parameters' ) == 0 )
	275	READ ( 11, '(A)', END=20 ) line
	276	ENDDO
	277	BACKSPACE ( 11 )
	278
	279	!
	280	!-- Read namelist
	281	READ ( 11, virtual_measurement_parameters, ERR = 10, END = 20 )
	282
	283	!
[3471]	284	!-- Set flag that indicates that the virtual measurement module is switched on
[3434]	285	IF ( use_virtual_measurement ) virtual_measurement = .TRUE.
	286
	287	GOTO 20
	288
	289	10 BACKSPACE( 11 )
	290	READ( 11 , '(A)') line
	291	CALL parin_fail_message( 'virtual_measurement_parameters', line )
	292
	293	20 CONTINUE
	294
	295	END SUBROUTINE vm_parin
	296
	297
	298	!------------------------------------------------------------------------------!
	299	! Description:
	300	! ------------
	301	!> Initialize virtual measurements: read coordiante arrays and measured
	302	!> variables, set indicies indicating the measurement points, read further
	303	!> attributes, etc..
	304	!------------------------------------------------------------------------------!
	305	SUBROUTINE vm_init
	306
	307	USE arrays_3d, &
	308	ONLY: zu, zw
	309
	310	USE control_parameters, &
	311	ONLY: message_string
	312
	313	USE grid_variables, &
	314	ONLY: ddx, ddy, dx, dy
	315
	316	USE indices, &
	317	ONLY: nxl, nxr, nyn, nys
	318
	319	USE netcdf_data_input_mod, &
	320	ONLY: init_model, input_file_vm, &
	321	netcdf_data_input_get_dimension_length, &
	322	netcdf_data_input_att, netcdf_data_input_var
	323
	324	USE surface_mod, &
	325	ONLY: get_topography_top_index_ji
	326
	327	IMPLICIT NONE
	328
	329	CHARACTER(LEN=5) :: dum !< dummy string indicate station id
	330	CHARACTER(LEN=10), DIMENSION(50) :: measured_variables_file = '' !< array with all measured variables read from NetCDF
	331	CHARACTER(LEN=10), DIMENSION(50) :: measured_variables = '' !< dummy array with all measured variables that are allowed
	332
	333	LOGICAL :: on_pe !< flag indicating that the respective measurement coordinate is on subdomain
	334
	335	INTEGER(iwp) :: dim_eutm !< dimension size of UTM easting coordinate
	336	INTEGER(iwp) :: dim_nutm !< dimension size of UTM northing coordinate
	337	INTEGER(iwp) :: dim_ntime !< dimension size of time coordinate
	338	INTEGER(iwp) :: dim_zag !< dimension size of height coordinate
	339	INTEGER(iwp) :: i !< grid index of virtual observation point in x-direction
	340	INTEGER(iwp) :: icov !< index range where observations should be taken in x-direction
	341	INTEGER(iwp) :: ii !< running index over all coordinate points of a measurement
[3471]	342	INTEGER(iwp) :: i_prev !< grid index along x for UTM coordinate at previous observation time step
[3434]	343	INTEGER(iwp) :: is !< grid index of real observation point of the respective station in x-direction
	344	INTEGER(iwp) :: j !< grid index of observation point in x-direction
	345	INTEGER(iwp) :: jcov !< index range where observations should be taken in y-direction
[3471]	346	INTEGER(iwp) :: j_prev !< grid index along y for UTM coordinate at previous observation time step
[3434]	347	INTEGER(iwp) :: js !< grid index of real observation point of the respective station in y-direction
	348	INTEGER(iwp) :: k !< grid index of observation point in x-direction
	349	INTEGER(iwp) :: kcov !< index range where observations should be taken in z-direction
	350	INTEGER(iwp) :: ks !< grid index of real observation point of the respective station in z-direction
[3471]	351	INTEGER(iwp) :: k_prev !< grid index along z for UTM coordinate at previous observation time step
[3434]	352	INTEGER(iwp) :: ksurf !< topography top index
	353	INTEGER(iwp) :: l !< running index over all stations
	354	INTEGER(iwp) :: len_char !< character length of single measured variables without Null character
	355	INTEGER(iwp) :: ll !< running index over all measured variables in file
	356	INTEGER(iwp) :: lll !< running index over all allowed variables
	357	INTEGER(iwp) :: n !< running index over trajectory coordinates
	358	INTEGER(iwp) :: ns !< counter variable for number of observation points on subdomain
	359	INTEGER(iwp) :: t !< running index over number of trajectories
	360
	361	REAL(wp) :: fill_eutm !< _FillValue for coordinate array E_UTM
	362	REAL(wp) :: fill_nutm !< _FillValue for coordinate array N_UTM
	363	REAL(wp) :: fill_zag !< _FillValue for height coordinate
	364
[3437]	365	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: e_utm !< easting UTM coordinate, temporary variable
	366	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: n_utm !< northing UTM coordinate, temporary variable,
	367	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: z_ag !< height coordinate relative to origin_z, temporary variable
[3434]	368	!
	369	!-- Obtain number of virtual measurement stations
	370	CALL netcdf_data_input_att( nvm, char_numstations, id_vm, input_file_vm, &
	371	global_attribute, 'open', '' )
	372	!
	373	!-- ALLOCATE data structure
	374	ALLOCATE( vmea(1:nvm) )
	375
[3437]	376	! print*, "nvm", nvm
[3434]	377	!
	378	!-- Read station coordinates and further attributes.
	379	!-- Note all coordinates are in UTM coordinates.
	380	DO l = 1, nvm
	381	!
	382	!-- Determine suffix which contains the ID
	383	IF( l < 10 ) THEN
	384	WRITE( dum, '(I1)') l
	385	ELSEIF( l < 100 ) THEN
	386	WRITE( dum, '(I2)') l
	387	ELSEIF( l < 1000 ) THEN
	388	WRITE( dum, '(I3)') l
	389	ELSEIF( l < 10000 ) THEN
	390	WRITE( dum, '(I4)') l
	391	ELSEIF( l < 100000 ) THEN
	392	WRITE( dum, '(I5)') l
	393	ENDIF
	394
	395	CALL netcdf_data_input_att( vmea(l)%origin_x_obs, char_origx &
	396	// TRIM( dum ), id_vm, '', global_attribute,&
	397	'', '' )
	398	CALL netcdf_data_input_att( vmea(l)%origin_y_obs, char_origy &
	399	// TRIM( dum ), id_vm, '', global_attribute,&
	400	'', '' )
	401	CALL netcdf_data_input_att( vmea(l)%site, char_site &
	402	// TRIM( dum ), id_vm, '', global_attribute,&
	403	'', '' )
	404	CALL netcdf_data_input_att( vmea(l)%feature_type, char_feature &
	405	// TRIM( dum ), id_vm, '', global_attribute,&
	406	'', '' )
	407
	408	!
	409	!--- Set logicals depending on the type of the measurement
	410	IF ( INDEX( vmea(l)%feature_type, type_tspr ) /= 0 ) THEN
	411	vmea(l)%timseries_profile = .TRUE.
	412	ELSEIF ( INDEX( vmea(l)%feature_type, type_ts ) /= 0 ) THEN
	413	vmea(l)%timseries = .TRUE.
	414	ELSEIF ( INDEX( vmea(l)%feature_type, type_traj ) /= 0 ) THEN
	415	vmea(l)%trajectory = .TRUE.
	416	ELSE
	417	!
	418	!-- Give error message
	419	message_string = 'Attribue featureType = ' // &
	420	TRIM( vmea(l)%feature_type ) // &
	421	' is not allowed.'
	422	CALL message( 'vm_init', 'PA0000', 1, 2, 0, 6, 0 )
	423	ENDIF
	424	!
	425	!-- Read string with all measured variables at this station
	426	measured_variables_file = ''
	427	CALL netcdf_data_input_var( measured_variables_file, &
	428	char_mv // TRIM( dum ), id_vm )
	429	!
	430	!-- Count the number of measured variables which match with the variables
	431	!-- which are allowed to be measured in PALM. Please note, for some
	432	!-- NetCDF interal reasons characters end with a NULL, i.e. also empty
	433	!-- characters contain a NULL. Therefore, check the strings for a Null to
	434	!-- get the correct character length in order to compare them with the list
	435	!-- of allowed variables.
	436	vmea(l)%nvar = 0
	437	DO ll = 1, SIZE( measured_variables_file )
	438	IF ( measured_variables_file(ll)(1:1) /= CHAR(0) .AND. &
	439	measured_variables_file(ll)(1:1) /= ' ') THEN
	440	!
	441	!-- Obtain character length of the character
	442	len_char = 1
	443	DO WHILE ( measured_variables_file(ll)(len_char:len_char) /= CHAR(0)&
	444	.AND. measured_variables_file(ll)(len_char:len_char) /= ' ' )
	445	len_char = len_char + 1
	446	ENDDO
	447	len_char = len_char - 1
	448	!
	449	!-- Now, compare the measured variable with the list of allowed
	450	!-- variables.
	451	DO lll= 1, SIZE( list_allowed_variables )
	452	IF ( measured_variables_file(ll)(1:len_char) == &
	453	TRIM( list_allowed_variables(lll) ) ) THEN
	454	vmea(l)%nvar = vmea(l)%nvar + 1
	455	measured_variables(vmea(l)%nvar) = &
	456	measured_variables_file(ll)(1:len_char)
	457	ENDIF
	458	ENDDO
	459	ENDIF
	460	ENDDO
	461	!
	462	!-- Allocate array for the measured variables names for the station l.
	463	ALLOCATE( vmea(l)%measured_vars_name(1:vmea(l)%nvar) )
	464
	465	DO ll = 1, vmea(l)%nvar
	466	vmea(l)%measured_vars_name(ll) = TRIM( measured_variables(ll) )
	467	ENDDO
	468
[3437]	469	! print*, "numvars", vmea(l)%nvar, vmea(l)%measured_vars_name(1:vmea(l)%nvar)
[3434]	470	!
	471	!-- For the actual measurement ID read the UTM coordinates. Based on these,
	472	!-- define the index space on each subdomain where measurements should be
	473	!-- taken. Note, the entire coordinate arrays will not be stored on data
	474	!-- type as this would exceed memory requirements, particularly for
	475	!-- trajectory measurements. If no variable will be virtually measured,
	476	!-- skip the reading.
	477	IF ( vmea(l)%nvar > 0 ) THEN
	478	!
	479	!-- For stationary measurements UTM coordinates are just one value and
	480	!-- its dimension is "station", while for mobile measurements UTM
	481	!-- coordinates are arrays. First, inquire dimension length for
	482	!-- UTM coordinates.
	483	IF ( vmea(l)%trajectory ) THEN
	484	!
	485	!-- For non-stationary measurements read the number of trajectories
	486	CALL netcdf_data_input_get_dimension_length( id_vm, &
	487	vmea(l)%ntraj, &
	488	"traj" // &
	489	TRIM( dum ) )
	490	CALL netcdf_data_input_get_dimension_length( id_vm, dim_ntime, &
	491	"ntime" // &
	492	TRIM( dum ) )
	493	!
	494	!-- For stationary measurements the dimension for UTM coordinates is 1
	495	ELSE
	496	vmea(l)%ntraj = 1
	497	dim_ntime = 1
	498	ENDIF
	499
	500	!
	501	!- Allocate array which defines individual time frame for each
	502	!-- trajectory or station
	503	ALLOCATE( vmea(l)%dim_t(1:vmea(l)%ntraj) )
[3437]	504	ALLOCATE( vmea(l)%ngp(1:vmea(l)%ntraj) )
[3434]	505	!
	506	!-- Allocate temporary arrays for UTM and height coordinates. Note,
	507	!-- on file UTM coordinates might be 1D or 2D variables
[3437]	508	ALLOCATE( e_utm(1:vmea(l)%ntraj,1:dim_ntime) )
	509	ALLOCATE( n_utm(1:vmea(l)%ntraj,1:dim_ntime) )
	510	ALLOCATE( z_ag(1:vmea(l)%ntraj,1:dim_ntime) )
[3434]	511	!
	512	!-- Read _FillValue attributes
	513	CALL netcdf_data_input_att( fill_eutm, char_fillvalue, &
	514	id_vm, '', .NOT. global_attribute, '', &
	515	char_eutm // TRIM( dum ) )
	516	CALL netcdf_data_input_att( fill_nutm, char_fillvalue, &
	517	id_vm, '', .NOT. global_attribute, '', &
	518	char_nutm // TRIM( dum ) )
	519	CALL netcdf_data_input_att( fill_zag, char_fillvalue, &
	520	id_vm, '', .NOT. global_attribute, '', &
	521	char_zag // TRIM( dum ) )
	522	!
	523	!-- Read UTM and height coordinates coordinates for all trajectories and
	524	!-- times.
[3437]	525	IF ( vmea(l)%trajectory ) THEN
	526	CALL netcdf_data_input_var( e_utm, char_eutm // TRIM( dum ), id_vm, &
	527	0, dim_ntime-1, 0, vmea(l)%ntraj-1 )
	528	CALL netcdf_data_input_var( n_utm, char_nutm // TRIM( dum ), id_vm, &
	529	0, dim_ntime-1, 0, vmea(l)%ntraj-1 )
	530	CALL netcdf_data_input_var( z_ag, char_zag // TRIM( dum ), id_vm, &
	531	0, dim_ntime-1, 0, vmea(l)%ntraj-1 )
	532	ELSE
[3471]	533	CALL netcdf_data_input_var( e_utm(1,:), char_eutm // TRIM( dum ), id_vm )
[3437]	534	CALL netcdf_data_input_var( n_utm(1,:), char_nutm // TRIM( dum ), id_vm )
	535	CALL netcdf_data_input_var( z_ag(1,:), char_zag // TRIM( dum ), id_vm )
	536	ENDIF
[3434]	537	!
	538	!-- Based on UTM coordinates, check if the measurement station or parts
	539	!-- of the trajectory is on subdomain. This case, setup grid index space
	540	!-- sample these quantities.
	541	ns = 0
	542	DO t = 1, vmea(l)%ntraj
	543	!
	544	!-- Determine the individual time coordinate length for each station and
	545	!-- trajectory. This is required as several stations and trajectories
	546	!-- are merged into one file but they do not have the same number of
	547	!-- points in time, hence, missing values may occur and cannot be
	548	!-- processed further.
	549	vmea(l)%dim_t(t) = 0
	550	DO n = 1, dim_ntime
[3437]	551	IF ( e_utm(t,n) /= fill_eutm .AND. &
	552	n_utm(t,n) /= fill_nutm .AND. &
	553	z_ag(t,n) /= fill_zag ) vmea(l)%dim_t(t) = n
[3434]	554	ENDDO
	555	!
	556	!-- First, compute relative x- and y-coordinates with respect to the
	557	!-- lower-left origin of the model domain, which is the difference
	558	!-- betwen UTM coordinates.
[3494]	559
[3437]	560	e_utm(t,1:vmea(l)%dim_t(t)) = e_utm(t,1:vmea(l)%dim_t(t)) &
	561	- init_model%origin_x
	562	n_utm(t,1:vmea(l)%dim_t(t)) = n_utm(t,1:vmea(l)%dim_t(t)) &
	563	- init_model%origin_y
[3434]	564	!
	565	!-- Compute grid indices relative to origin and check if these are
	566	!-- on the subdomain. Note, virtual measurements will be taken also
	567	!-- at grid points surrounding the station, hence, check also for
	568	!-- these grid points.
	569	vmea(l)%ngp(t) = 0
	570	k_prev = -999
	571	j_prev = -999
	572	i_prev = -999
[3437]	573	DO n = 1, vmea(l)%dim_t(t)
	574	is = INT( ( e_utm(t,n) + 0.5_wp * dx ) * ddx, KIND = iwp )
	575	js = INT( ( n_utm(t,n) + 0.5_wp * dy ) * ddy, KIND = iwp )
[3434]	576	!
	577	!-- Is the observation point on subdomain?
	578	on_pe = ( is >= nxl .AND. is <= nxr .AND. &
	579	js >= nys .AND. js <= nyn )
	580	!
	581	!-- If the measurement is on subdomain, determine vertical index
	582	!-- which refers to the observation height above ground level.
	583	ks = k_prev
	584	IF ( on_pe ) THEN
	585	ksurf = get_topography_top_index_ji( js, is, 's' )
[3437]	586	ks = MINLOC( ABS( zu - zw(ksurf) - z_ag(t,n) ), DIM = 1 ) - 1
[3434]	587	ENDIF
	588	!
	589	!-- Count the number of observation points in index space on
	590	!-- subdomain. Only increment if grid indices are different from
	591	!-- the previous one.
	592	IF ( on_pe .AND. is /= i_prev .AND. js /= j_prev .AND. &
	593	ks /= k_prev ) THEN
	594	ns = ns + 1
	595	vmea(l)%ngp(t) = vmea(l)%ngp(t) + 1
	596	ENDIF
[3437]	597
[3434]	598	!-- Store arrays for next iteration - avoid double counting
	599	i_prev = is
	600	j_prev = js
	601	k_prev = ks
	602	ENDDO
	603
	604	ENDDO
	605
	606	!
	607	!-- Store number of observation points on subdomain and allocate index
	608	!-- arrays.
	609	vmea(l)%ns = ns
	610
	611	ALLOCATE( vmea(l)%i(1:vmea(l)%ns) )
	612	ALLOCATE( vmea(l)%j(1:vmea(l)%ns) )
	613	ALLOCATE( vmea(l)%k(1:vmea(l)%ns) )
	614
[3437]	615	! print*, "Num ns: ", vmea(l)%ns, "per traj", vmea(l)%ngp(:)
[3434]	616	!
	617	!-- Repeat the prior loop and save the grid indices relevant for
	618	!-- sampling.
	619	ns = 0
	620	DO t = 1, vmea(l)%ntraj
	621	!
	622	!-- Compute grid indices relative to origin and check if these are
	623	!-- on the subdomain. Note, virtual measurements will be taken also
	624	!-- at grid points surrounding the station, hence, check also for
	625	!-- these grid points.
	626	k_prev = -999
	627	j_prev = -999
	628	i_prev = -999
[3437]	629	DO n = 1, vmea(l)%dim_t(t)
	630	is = INT( ( e_utm(t,n) + 0.5_wp * dx ) * ddx, KIND = iwp )
	631	js = INT( ( n_utm(t,n) + 0.5_wp * dy ) * ddy, KIND = iwp )
[3434]	632	!
	633	!-- Is the observation point on subdomain?
	634	on_pe = ( is >= nxl .AND. is <= nxr .AND. &
	635	js >= nys .AND. js <= nyn )
	636	!
	637	!-- If the measurement is on subdomain, determine vertical index
	638	!-- which refers to the observation height above ground level.
	639	ks = k_prev
	640	IF ( on_pe ) THEN
	641	ksurf = get_topography_top_index_ji( js, is, 's' )
[3437]	642	ks = MINLOC( ABS( zu - zw(ksurf) - z_ag(t,n) ), DIM = 1 ) - 1
[3434]	643	ENDIF
	644	!
	645	!-- Count the number of observation points in index space on
	646	!-- subdomain. Only increment if grid indices are different from
	647	!-- the previous one.
	648	IF ( on_pe .AND. is /= i_prev .AND. js /= j_prev .AND. &
	649	ks /= k_prev ) THEN
	650	ns = ns + 1
	651	vmea(l)%i(ns) = is
	652	vmea(l)%j(ns) = js
	653	vmea(l)%k(ns) = ks
	654	ENDIF
	655	!
	656	!-- Store arrays for next iteration - avoid double counting
	657	i_prev = is
	658	j_prev = js
	659	k_prev = ks
	660	ENDDO
	661
	662	ENDDO
	663	!
	664	!-- Allocate array to save the sampled values.
	665	!-- Todo: Is it better to allocate for all variables at a station
	666	!-- and store all the values before writing, or sample the variables
	667	!-- directly in the data output?
	668	ALLOCATE( vmea(l)%measured_vars(1:vmea(l)%nvar,1:vmea(l)%ns) )
	669	!
	670	!-- Initialize with _FillValue
	671	vmea(l)%measured_vars(1:vmea(l)%nvar,1:vmea(l)%ns) = vmea(l)%fillout
	672	!
	673	!-- Deallocate temporary coordinate arrays
	674	IF ( ALLOCATED( e_utm ) ) DEALLOCATE( e_utm )
	675	IF ( ALLOCATED( n_utm ) ) DEALLOCATE( n_utm )
	676	IF ( ALLOCATED( z_ag ) ) DEALLOCATE( z_ag )
	677	ENDIF
	678	ENDDO
[3471]	679	flush(9)
[3434]	680
	681	!
	682	!-- Close input file for virtual measurements. Therefore, just call
	683	!-- the read attribute routine with the "close" option.
	684	CALL netcdf_data_input_att( nvm, char_numstations, id_vm, '', &
	685	global_attribute, 'close', '' )
	686	END SUBROUTINE vm_init
	687
	688
	689	!------------------------------------------------------------------------------!
	690	! Description:
	691	! ------------
	692	!> Sampling of the actual quantities along the observation coordinates
	693	!------------------------------------------------------------------------------!
[3471]	694	SUBROUTINE vm_sampling
[3434]	695
	696	USE arrays_3d !, &
	697	! ONLY: pt
[3471]	698
	699	USE surface_mod
[3434]	700
	701	IMPLICIT NONE
	702
	703	CHARACTER(LEN=10) :: trimvar !< dummy for the measured variable name
	704
	705	INTEGER(iwp) :: l !<
	706	INTEGER(iwp) :: m !<
	707	INTEGER(iwp) :: var !<
[3471]	708
	709	INTEGER(iwp) :: mm, j, i
[3434]	710
	711	!
	712	!-- Loop over all stations. For each possible variable loop over all
	713	!-- observation points
	714	DO l = 1, nvm
	715	!
	716	!-- Loop over all measured variables. Please note, for the moment
	717	!-- the same indices for scalar and velocity components are used.
	718	!-- ToDo: Revise this later.
[3494]	719	DO m = 1, vmea(l)%ns
	720	j = vmea(l)%j(m)
	721	i = vmea(l)%i(m)
[3471]	722	!
	723	! IF ( i >= nxl .AND. i <= nxr .AND. &
	724	! j >= nys .AND. j <= nyn ) THEN
	725	! IF ( surf_def_h(0)%start_index(j,i) <= &
	726	! surf_def_h(0)%end_index(j,i) ) THEN
	727	! mm = surf_def_h(0)%end_index(j,i)
	728	!
	729	! surf_def_h(0)%pt_surface(mm) = -99.0
	730	! ENDIF
	731	! ENDIF
	732	! ENDDO
	733	! DO var = 1, vmea(l)%nvar
	734	! trimvar = TRIM( vmea(l)%measured_vars_name(var) )
	735	!
	736	! IF ( TRIM( trimvar ) == 'theta' ) THEN
	737	! DO m = 1, vmea(l)%ns
	738	! vmea(l)%measured_vars(var,m) = pt(vmea(l)%k(m),vmea(l)%j(m),vmea(l)%i(m))
	739	! ENDDO
	740	! ENDIF
	741	! IF ( TRIM( trimvar ) == 'w' ) THEN
	742	! DO m = 1, vmea(l)%ns
	743	! vmea(l)%measured_vars(var,m) = w(vmea(l)%k(m),vmea(l)%j(m),vmea(l)%i(m))
	744	! ENDDO
	745	! ENDIF
	746	! IF ( TRIM( trimvar ) == 'v' ) THEN
	747	! DO m = 1, vmea(l)%ns
	748	! vmea(l)%measured_vars(var,m) = v(vmea(l)%k(m),vmea(l)%j(m),vmea(l)%i(m))
	749	! ENDDO
	750	! ENDIF
	751	! IF ( TRIM( trimvar ) == 'u' ) THEN
	752	! DO m = 1, vmea(l)%ns
	753	! vmea(l)%measured_vars(var,m) = u(vmea(l)%k(m),vmea(l)%j(m),vmea(l)%i(m))
	754	! ENDDO
	755	! ENDIF
[3494]	756	ENDDO
[3434]	757
	758	ENDDO
	759
[3471]	760	END SUBROUTINE vm_sampling
[3434]	761
	762
[3471]	763	END MODULE virtual_measurement_mod

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