[59] | 1 | ;+ |
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| 2 | ; |
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[118] | 3 | ; @file_comments |
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[163] | 4 | ; 1) extract from a NetCDF file the longitude, latitude, and 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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[136] | 7 | ; or |
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| 8 | ; 2) given longitude and latitude arrays get their dimensions and make |
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| 9 | ; sure they are 1D or 2D arrays |
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[118] | 10 | ; |
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[157] | 11 | ; @categories |
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| 12 | ; Interpolation |
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[59] | 13 | ; |
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[118] | 14 | ; @examples |
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| 15 | ; |
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[125] | 16 | ; 1) |
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[121] | 17 | ; IDL> get_gridparams, file, lonname, latname, lon, lat, jpi, jpj, n_dimensions |
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[59] | 18 | ; |
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[118] | 19 | ; or |
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[59] | 20 | ; |
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[125] | 21 | ; 2) |
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[121] | 22 | ; IDL> get_gridparams, lon, lat, jpi, jpj, n_dimensions |
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[59] | 23 | ; |
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[118] | 24 | ; 1) |
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[136] | 25 | ; @param in1 {in}{required} |
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[163] | 26 | ; Case 1: the name of the netcdf file |
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| 27 | ; Case 2: 1d or 2D arrays defining longitudes and latitudes. |
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| 28 | ; Out: the variable that will contain the longitudes |
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[59] | 29 | ; |
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[136] | 30 | ; @param in2 {in}{required} |
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[163] | 31 | ; Case 1: the name of the variable that contains the longitude in the NetCDF file |
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| 32 | ; Case 2: 1d or 2D arrays defining longitudes and latitudes. |
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| 33 | ; Note that these arrays are also outputs and can therefore be modified. |
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| 34 | ; Out: the variable that will contain the latitudes |
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[136] | 35 | ; |
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| 36 | ; @param in3 {in}{required} |
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[163] | 37 | ; Case 1: the name of the variable that contains the latitude in the NetCDF file |
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| 38 | ; Case 2: the number of points in the longitudinal direction. |
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[136] | 39 | ; |
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| 40 | ; @param in4 {out} |
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[163] | 41 | ; Case 1: the number of points in the longitudinal direction |
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| 42 | ; Case 2: the number of points in the latitudinal direction |
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[136] | 43 | ; |
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| 44 | ; @param in5 {out} |
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[163] | 45 | ; Case 1: the number of points in the latitudinal direction |
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| 46 | ; Case 2: 1 or 2 to specify if lon and lat should be 1D (jpi or jpj) |
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| 47 | ; arrays or 2D arrays (jpi,jpj). Note that of n_dimensions = 1, then the |
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| 48 | ; grid must be regular (each longitudes must be the same for all latitudes |
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| 49 | ; and each latitudes should be the same for all longitudes). |
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[136] | 50 | ; |
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| 51 | ; @param in6 {out} |
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| 52 | ; the variable that will contain the longitudes |
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| 53 | ; |
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| 54 | ; @param in7 {out} |
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| 55 | ; the variable that will contain the latitudes |
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| 56 | ; |
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| 57 | ; @param in8 {out} |
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| 58 | ; 1 or 2 to specify if lon and lat should be 1D (jpi or jpj) |
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| 59 | ; |
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| 60 | ; @keyword DOUBLE |
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| 61 | ; use double precision to perform the computation |
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| 62 | ; |
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[118] | 63 | ; @examples |
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| 64 | ; |
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| 65 | ; 1) IDL> ncdf_get_gridparams, 'coordinates_ORCA_R05.nc', 'glamt', 'gphit' $ |
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[59] | 66 | ; , olon, olat, jpio, jpjo, 2 |
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| 67 | ; |
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[118] | 68 | ; 2) IDL> ncdf_get_gridparams, olon, olat, jpio, jpjo, 2 |
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[59] | 69 | ; |
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[101] | 70 | ; @history |
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[118] | 71 | ; November 2005: Sebastien Masson (smasson\@lodyc.jussieu.fr) |
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| 72 | ; |
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| 73 | ; @version $Id$ |
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| 74 | ; |
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[59] | 75 | ;- |
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| 76 | ; |
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| 77 | ;---------------------------------------------------------- |
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| 78 | ;---------------------------------------------------------- |
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| 79 | ; |
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| 80 | PRO get_gridparams, in1, in2, in3, in4, in5, in6, in7, in8, DOUBLE = double |
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| 81 | ; file, lonname, latname, lon, lat, jpi, jpj, n_dimensions |
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| 82 | ; lon, lat, jpi, jpj, n_dimensions |
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| 83 | ; |
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[114] | 84 | ; |
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| 85 | compile_opt idl2, strictarrsubs |
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| 86 | ; |
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[59] | 87 | CASE n_params() OF |
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| 88 | 8:BEGIN |
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| 89 | ; get longitude and latitude |
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[118] | 90 | IF file_test(in1) EQ 0 THEN BEGIN |
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[59] | 91 | print, 'file ' + in1 + ' does not exist' |
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| 92 | stop |
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| 93 | ENDIF |
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| 94 | cdfido = ncdf_open(in1) |
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| 95 | ncdf_varget, cdfido, in2, lon |
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| 96 | ncdf_varget, cdfido, in3, lat |
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[118] | 97 | ncdf_close, cdfido |
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[59] | 98 | n_dimensions = in8 |
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| 99 | END |
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[118] | 100 | 5:BEGIN |
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[59] | 101 | lon = temporary(in1) |
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| 102 | lat = temporary(in2) |
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| 103 | n_dimensions = in5 |
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| 104 | END |
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[118] | 105 | ELSE:BEGIN |
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[59] | 106 | print, 'Bad nimber of input parameters' |
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| 107 | stop |
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| 108 | end |
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| 109 | ENDCASE |
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| 110 | ; |
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| 111 | sizelon = size(lon) |
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| 112 | sizelat = size(lat) |
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[118] | 113 | CASE 1 OF |
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[59] | 114 | ;------- |
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| 115 | ; lon and lat are 1D arrays |
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| 116 | ;------- |
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[118] | 117 | sizelon[0] EQ 1 AND sizelat[0] EQ 1:BEGIN |
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[59] | 118 | ; get jpi and jpj |
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| 119 | jpi = sizelon[1] |
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| 120 | jpj = sizelat[1] |
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| 121 | ; make sure that lon and lat have the good number of dimensions |
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[118] | 122 | CASE n_dimensions OF |
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[59] | 123 | 1: |
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| 124 | 2:BEGIN |
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| 125 | ; make lon and lat 2D arrays |
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| 126 | lon = temporary(lon) # replicate(1, jpj) |
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| 127 | lat = replicate(1, jpi) # temporary(lat) |
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| 128 | END |
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| 129 | ELSE:stop |
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| 130 | ENDCASE |
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| 131 | END |
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| 132 | ;------- |
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| 133 | ; lon is 2D array and lat is 1D array |
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| 134 | ;------- |
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[118] | 135 | sizelon[0] EQ 2 AND sizelat[0] EQ 1:BEGIN |
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[59] | 136 | ; get jpi and jpj |
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| 137 | jpi = sizelon[1] |
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| 138 | jpj = sizelon[2] |
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| 139 | IF jpj NE n_elements(lat) THEN stop |
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| 140 | ; make sure that lon and lat have the good number of dimensions |
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[118] | 141 | CASE n_dimensions OF |
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| 142 | 1:BEGIN |
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| 143 | IF array_equal(lon, lon[*, 0] # replicate(1, jpj)) NE 1 THEN BEGIN |
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[59] | 144 | print, 'Longitudes are not the same for all latitudes, imposible to extract a 1D array of the longitudes' |
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| 145 | stop |
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| 146 | ENDIF |
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| 147 | lon = lon[*, 0] |
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| 148 | END |
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| 149 | 2:lat = replicate(1, jpi) # temporary(lat) |
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| 150 | ELSE:stop |
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| 151 | ENDCASE |
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| 152 | END |
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| 153 | ;------- |
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| 154 | ; lon is 1D array and lat is 2D array |
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| 155 | ;------- |
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[118] | 156 | sizelon[0] EQ 1 AND sizelat[0] EQ 2:BEGIN |
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[59] | 157 | ; get jpi and jpj |
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| 158 | jpi = sizelat[1] |
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| 159 | jpj = sizelat[2] |
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| 160 | IF jpi NE n_elements(lon) THEN stop |
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| 161 | ; make sure that lon and lat have the good number of dimensions |
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[118] | 162 | CASE n_dimensions OF |
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| 163 | 1:BEGIN |
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| 164 | IF array_equal(lat, replicate(1, jpi) # lat[0, *]) NE 1 THEN BEGIN |
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[59] | 165 | print, 'Latitudes are not the same for all longitudes, imposible to extract a 1D array of the latitudes' |
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| 166 | stop |
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| 167 | ENDIF |
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| 168 | lat = reform(lat[0, *]) |
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| 169 | END |
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| 170 | 2:lon = temporary(lon) # replicate(1, jpj) |
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| 171 | ELSE:stop |
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| 172 | ENDCASE |
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| 173 | END |
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| 174 | ;------- |
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| 175 | ; lon and lat are 2D arrays |
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| 176 | ;------- |
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[118] | 177 | sizelon[0] EQ 2 AND sizelat[0] EQ 2:BEGIN |
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[59] | 178 | ; get jpi and jpj |
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| 179 | IF array_equal(sizelon[1:2], sizelat[1:2]) NE 1 THEN stop |
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| 180 | jpi = sizelon[1] |
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[118] | 181 | jpj = sizelon[2] |
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[59] | 182 | ; make sure that lon and lat have the good number of dimensions |
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[118] | 183 | CASE n_dimensions OF |
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| 184 | 1:BEGIN |
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| 185 | IF array_equal(lon, lon[*, 0] # replicate(1, jpj)) NE 1 THEN BEGIN |
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[59] | 186 | print, 'Longitudes are not the same for all latitudes, imposible to extract a 1D array of the longitudes' |
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| 187 | stop |
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| 188 | ENDIF |
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| 189 | lon = lon[*, 0] |
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[118] | 190 | IF array_equal(lat, replicate(1, jpi) # reform(lat[0, *])) NE 1 THEN BEGIN |
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[59] | 191 | print, 'Latitudes are not the same for all longitudes, imposible to extract a 1D array of the latitudes' |
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| 192 | stop |
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| 193 | ENDIF |
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| 194 | lat = reform(lat[0, *]) |
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| 195 | END |
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| 196 | 2: |
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| 197 | ELSE:stop |
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| 198 | ENDCASE |
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| 199 | END |
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| 200 | ;------- |
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| 201 | ; lon and lat are not 1D and/or 2D arrays |
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| 202 | ;------- |
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| 203 | ELSE:stop |
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| 204 | ENDCASE |
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| 205 | ; |
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| 206 | ;------- |
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| 207 | ; double keyword |
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| 208 | ;------- |
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[118] | 209 | if keyword_set(double) then BEGIN |
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[59] | 210 | lon = double(temporary(lon)) |
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| 211 | lat = double(temporary(lat)) |
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| 212 | ENDIF |
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| 213 | ; |
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| 214 | ; give back the right outparameters. |
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| 215 | ; |
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| 216 | |
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| 217 | CASE n_params() OF |
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| 218 | 8:BEGIN |
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| 219 | in4 = temporary(lon) |
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| 220 | in5 = temporary(lat) |
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| 221 | in6 = temporary(jpi) |
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| 222 | in7 = temporary(jpj) |
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| 223 | END |
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| 224 | 5:BEGIN |
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| 225 | in1 = temporary(lon) |
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| 226 | in2 = temporary(lat) |
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| 227 | in3 = temporary(jpi) |
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| 228 | in4 = temporary(jpj) |
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| 229 | END |
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| 230 | ENDCASE |
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| 231 | ; |
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| 232 | |
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| 233 | return |
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| 234 | END |
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