[59] | 1 | ;+ |
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| 2 | ; |
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[118] | 3 | ; @file_comments |
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[271] | 4 | ; Case 1: extract from a NetCDF file longitude and latitude arrays, their dimensions |
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[136] | 5 | ; and make sure it is 1D or 2D arrays |
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[59] | 6 | ; |
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[271] | 7 | ; Case 2: given longitude and latitude arrays, get their dimensions and make |
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[136] | 8 | ; sure they are 1D or 2D arrays |
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[118] | 9 | ; |
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[157] | 10 | ; @categories |
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| 11 | ; Interpolation |
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[59] | 12 | ; |
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[118] | 13 | ; @examples |
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| 14 | ; |
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[271] | 15 | ; Case 1: |
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| 16 | ; IDL> get_gridparams, file name/id, lonname, latname, lon, lat, jpi, jpj, n_dimensions |
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[59] | 17 | ; |
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[271] | 18 | ; Case 2: |
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[121] | 19 | ; IDL> get_gridparams, lon, lat, jpi, jpj, n_dimensions |
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[59] | 20 | ; |
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[136] | 21 | ; @param in1 {in}{required} |
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[271] | 22 | ; Case 1: name or the id (returned by ncdf_open) of the netcdf file |
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| 23 | ; Case 2: 1D or 2D arrays defining longitudes, will be forced to have |
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| 24 | ; n_dimensions dimensions when returned |
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[59] | 25 | ; |
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[136] | 26 | ; @param in2 {in}{required} |
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[271] | 27 | ; Case 1: name of the variable containing the longitude in the NetCDF file |
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| 28 | ; Case 2: 1D or 2D arrays defining latitudes, will be forced to have |
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| 29 | ; n_dimensions dimensions when returned |
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[136] | 30 | ; |
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[271] | 31 | ; @param in3 |
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| 32 | ; Case 1: name of the variable containing the latitude in the NetCDF file |
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| 33 | ; Case 2: returned number of points in longitudinal direction. |
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[136] | 34 | ; |
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| 35 | ; @param in4 {out} |
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[271] | 36 | ; Case 1: returned longitudes array, with n_dimensions dimensions |
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| 37 | ; Case 2: returned number of points in latitudinal direction |
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[136] | 38 | ; |
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[271] | 39 | ; @param in5 |
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| 40 | ; Case 1: returned latitudes array, with n_dimensions dimensions |
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| 41 | ; Case 2: input scalar (1 or 2) to specify if lon and lat should be returned |
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| 42 | ; as 1D or 2D arrays. Note that if n_dimensions = 1, the grid must be |
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| 43 | ; regular (longitude and latitudes can be described as 1D arrays). |
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[136] | 44 | ; |
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| 45 | ; @param in6 {out} |
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[271] | 46 | ; Case 1: returned number of points in longitudinal direction. |
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[136] | 47 | ; |
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| 48 | ; @param in7 {out} |
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[271] | 49 | ; Case 1: returned number of points in latitudinal direction |
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[136] | 50 | ; |
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[271] | 51 | ; @param in8 {in} |
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| 52 | ; Case 1: input scalar (1 or 2) to specify if lon and lat should be returned |
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| 53 | ; as 1D or 2D arrays. Note that if n_dimensions = 1, the grid must be |
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| 54 | ; regular (longitude and latitudes can be described as 1D arrays). |
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[136] | 55 | ; |
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[271] | 56 | ; @keyword DOUBLE {default=0}{type=scalar: 0 or 1} |
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| 57 | ; activate to force double precision for lon/lat arrays |
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[136] | 58 | ; |
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[118] | 59 | ; @examples |
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| 60 | ; |
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| 61 | ; 1) IDL> ncdf_get_gridparams, 'coordinates_ORCA_R05.nc', 'glamt', 'gphit' $ |
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[59] | 62 | ; , olon, olat, jpio, jpjo, 2 |
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| 63 | ; |
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[118] | 64 | ; 2) IDL> ncdf_get_gridparams, olon, olat, jpio, jpjo, 2 |
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[59] | 65 | ; |
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[101] | 66 | ; @history |
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[118] | 67 | ; November 2005: Sebastien Masson (smasson\@lodyc.jussieu.fr) |
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| 68 | ; |
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[231] | 69 | ; @version |
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| 70 | ; $Id$ |
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[118] | 71 | ; |
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[59] | 72 | ;- |
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| 73 | PRO get_gridparams, in1, in2, in3, in4, in5, in6, in7, in8, DOUBLE = double |
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| 74 | ; file, lonname, latname, lon, lat, jpi, jpj, n_dimensions |
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| 75 | ; lon, lat, jpi, jpj, n_dimensions |
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| 76 | ; |
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[114] | 77 | compile_opt idl2, strictarrsubs |
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| 78 | ; |
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[59] | 79 | CASE n_params() OF |
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| 80 | 8:BEGIN |
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| 81 | ; get longitude and latitude |
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[271] | 82 | IF size(in1, /type) EQ 7 THEN BEGIN |
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| 83 | IF file_test(in1) EQ 0 THEN BEGIN |
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| 84 | ras = report('file ' + in1 + ' does not exist') |
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| 85 | stop |
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| 86 | ENDIF |
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| 87 | cdfido = ncdf_open(in1) |
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| 88 | ENDIF ELSE cdfido = in1 |
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[59] | 89 | ncdf_varget, cdfido, in2, lon |
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| 90 | ncdf_varget, cdfido, in3, lat |
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[271] | 91 | IF size(in1, /type) EQ 7 THEN ncdf_close, cdfido |
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[59] | 92 | n_dimensions = in8 |
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| 93 | END |
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[118] | 94 | 5:BEGIN |
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[59] | 95 | lon = temporary(in1) |
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| 96 | lat = temporary(in2) |
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| 97 | n_dimensions = in5 |
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| 98 | END |
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[118] | 99 | ELSE:BEGIN |
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[236] | 100 | ras = report('Bad number of input parameters') |
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[59] | 101 | stop |
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| 102 | end |
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| 103 | ENDCASE |
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| 104 | ; |
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| 105 | sizelon = size(lon) |
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| 106 | sizelat = size(lat) |
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[118] | 107 | CASE 1 OF |
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[59] | 108 | ;------- |
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| 109 | ; lon and lat are 1D arrays |
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| 110 | ;------- |
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[118] | 111 | sizelon[0] EQ 1 AND sizelat[0] EQ 1:BEGIN |
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[59] | 112 | ; get jpi and jpj |
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| 113 | jpi = sizelon[1] |
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| 114 | jpj = sizelat[1] |
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| 115 | ; make sure that lon and lat have the good number of dimensions |
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[118] | 116 | CASE n_dimensions OF |
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[59] | 117 | 1: |
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| 118 | 2:BEGIN |
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| 119 | ; make lon and lat 2D arrays |
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| 120 | lon = temporary(lon) # replicate(1, jpj) |
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| 121 | lat = replicate(1, jpi) # temporary(lat) |
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| 122 | END |
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| 123 | ELSE:stop |
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| 124 | ENDCASE |
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| 125 | END |
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| 126 | ;------- |
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| 127 | ; lon is 2D array and lat is 1D array |
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| 128 | ;------- |
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[118] | 129 | sizelon[0] EQ 2 AND sizelat[0] EQ 1:BEGIN |
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[59] | 130 | ; get jpi and jpj |
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| 131 | jpi = sizelon[1] |
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| 132 | jpj = sizelon[2] |
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| 133 | IF jpj NE n_elements(lat) THEN stop |
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| 134 | ; make sure that lon and lat have the good number of dimensions |
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[118] | 135 | CASE n_dimensions OF |
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| 136 | 1:BEGIN |
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| 137 | IF array_equal(lon, lon[*, 0] # replicate(1, jpj)) NE 1 THEN BEGIN |
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[236] | 138 | ras = report('Longitudes are not the same for all latitudes, impossible to extract a 1D array of the longitudes') |
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[59] | 139 | stop |
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| 140 | ENDIF |
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| 141 | lon = lon[*, 0] |
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| 142 | END |
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| 143 | 2:lat = replicate(1, jpi) # temporary(lat) |
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| 144 | ELSE:stop |
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| 145 | ENDCASE |
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| 146 | END |
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| 147 | ;------- |
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| 148 | ; lon is 1D array and lat is 2D array |
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| 149 | ;------- |
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[118] | 150 | sizelon[0] EQ 1 AND sizelat[0] EQ 2:BEGIN |
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[59] | 151 | ; get jpi and jpj |
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| 152 | jpi = sizelat[1] |
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| 153 | jpj = sizelat[2] |
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| 154 | IF jpi NE n_elements(lon) THEN stop |
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| 155 | ; make sure that lon and lat have the good number of dimensions |
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[118] | 156 | CASE n_dimensions OF |
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| 157 | 1:BEGIN |
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| 158 | IF array_equal(lat, replicate(1, jpi) # lat[0, *]) NE 1 THEN BEGIN |
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[236] | 159 | ras = report('Latitudes are not the same for all longitudes, impossible to extract a 1D array of the latitudes') |
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[59] | 160 | stop |
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| 161 | ENDIF |
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| 162 | lat = reform(lat[0, *]) |
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| 163 | END |
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| 164 | 2:lon = temporary(lon) # replicate(1, jpj) |
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| 165 | ELSE:stop |
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| 166 | ENDCASE |
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| 167 | END |
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| 168 | ;------- |
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| 169 | ; lon and lat are 2D arrays |
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| 170 | ;------- |
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[118] | 171 | sizelon[0] EQ 2 AND sizelat[0] EQ 2:BEGIN |
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[59] | 172 | ; get jpi and jpj |
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| 173 | IF array_equal(sizelon[1:2], sizelat[1:2]) NE 1 THEN stop |
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| 174 | jpi = sizelon[1] |
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[118] | 175 | jpj = sizelon[2] |
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[59] | 176 | ; make sure that lon and lat have the good number of dimensions |
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[118] | 177 | CASE n_dimensions OF |
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| 178 | 1:BEGIN |
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| 179 | IF array_equal(lon, lon[*, 0] # replicate(1, jpj)) NE 1 THEN BEGIN |
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[236] | 180 | ras = report('Longitudes are not the same for all latitudes, impossible to extract a 1D array of the longitudes') |
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[59] | 181 | stop |
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| 182 | ENDIF |
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| 183 | lon = lon[*, 0] |
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[118] | 184 | IF array_equal(lat, replicate(1, jpi) # reform(lat[0, *])) NE 1 THEN BEGIN |
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[236] | 185 | ras = report('Latitudes are not the same for all longitudes, impossible to extract a 1D array of the latitudes') |
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[59] | 186 | stop |
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| 187 | ENDIF |
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| 188 | lat = reform(lat[0, *]) |
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| 189 | END |
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| 190 | 2: |
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| 191 | ELSE:stop |
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| 192 | ENDCASE |
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| 193 | END |
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| 194 | ;------- |
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| 195 | ; lon and lat are not 1D and/or 2D arrays |
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| 196 | ;------- |
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[236] | 197 | ELSE: BEGIN |
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| 198 | ras = report('Longitudes and latitudes are not 1D and/or 2D arrays') |
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| 199 | stop |
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| 200 | END |
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[59] | 201 | ENDCASE |
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| 202 | ; |
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| 203 | ;------- |
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| 204 | ; double keyword |
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| 205 | ;------- |
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[118] | 206 | if keyword_set(double) then BEGIN |
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[59] | 207 | lon = double(temporary(lon)) |
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| 208 | lat = double(temporary(lat)) |
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| 209 | ENDIF |
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| 210 | ; |
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| 211 | ; give back the right outparameters. |
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| 212 | ; |
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| 213 | |
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| 214 | CASE n_params() OF |
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| 215 | 8:BEGIN |
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| 216 | in4 = temporary(lon) |
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| 217 | in5 = temporary(lat) |
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| 218 | in6 = temporary(jpi) |
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| 219 | in7 = temporary(jpj) |
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| 220 | END |
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| 221 | 5:BEGIN |
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| 222 | in1 = temporary(lon) |
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| 223 | in2 = temporary(lat) |
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| 224 | in3 = temporary(jpi) |
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| 225 | in4 = temporary(jpj) |
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| 226 | END |
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| 227 | ENDCASE |
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| 228 | ; |
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| 229 | |
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| 230 | return |
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| 231 | END |
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