1 | ;+ |
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2 | ; |
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3 | ; @file_comments |
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4 | ; |
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5 | ; @categories |
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6 | ; |
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7 | ; @param NAMEFILE |
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8 | ; |
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9 | ; @keyword GRID {default='T'}{type=scalar string} |
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10 | ; Used to specify on which grid type are located the data |
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11 | ; |
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12 | ; @keyword _EXTRA |
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13 | ; Used to pass keywords to <pro>isafile</pro> |
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14 | ; and <pro>ncdf_getaxis</pro> |
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15 | ; |
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16 | ; @returns |
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17 | ; |
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18 | ; @uses |
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19 | ; |
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20 | ; @restrictions |
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21 | ; |
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22 | ; @examples |
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23 | ; |
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24 | ; @history |
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25 | ; |
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26 | ; @version |
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27 | ; $Id$ |
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28 | ; |
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29 | ; @todo |
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30 | ; seb : I don't know what to do with that... |
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31 | ; |
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32 | ;- |
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33 | ; |
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34 | ; liste des presupposes: |
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35 | ; 1) le fichier a lire est un fichier netcdf |
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36 | ; 2) le nom de ce fichier finit |
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37 | ; par U.nc, V.nc, W.nc, T.nc ou F.nc, la lettre avant le |
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38 | ; nc designant la grille a laquelle se rapporte la champ. |
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39 | ; Si tel n''est pas la cas, le fichier est attribue a la grille |
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40 | ; T. |
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41 | ; 3) ce fichier contient une dimension infinie qui doit etre |
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42 | ; celle qui se rapporte au temps et au mois 2 autres dimensions |
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43 | ; dont les noms sont 'x','lon...','xi_...' et 'y','lat...' ou |
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44 | ; 'eta_...' ou bien en majuscule. |
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45 | ; 4) il doit exister ds ce fichier une unique variable n''ayant |
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46 | ; qu''une dimension et etant la dimension temporelle. cette |
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47 | ; variable sera prise comme axe des temps. Rq: si plusieurs |
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48 | ; variables verifient ces criteres on considere la premiere |
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49 | ; variable |
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50 | ; 5) Cette variable axe des temps doit contenir l''attribut |
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51 | ; 'units' qui doit etre ecrit suivant la syntaxe: |
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52 | ; "seconds since 0001-01-01 00:00:00" |
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53 | ; "hours since 0001-01-01 00:00:00" |
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54 | ; "days since 1979-01-01 00:59:59" |
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55 | ; "months since 1979-01-01 00:59:59" |
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56 | ; "years since 1979-01-01 00:59:59" |
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57 | ; |
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58 | ; je crois que c''est tout! |
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59 | ; |
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60 | ; GRID='[UTVWF]' to specify the type of grid. Defaut is (1) |
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61 | ; based on the name of the file if the file ends by |
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62 | ; GRID[._][TUVFW].NC (not case sensible) or (2) T if case (1) |
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63 | ; is not found. |
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64 | ; |
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65 | ; |
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66 | FUNCTION scanfile, namefile, GRID = GRID, _EXTRA = ex |
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67 | ; |
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68 | compile_opt idl2, strictarrsubs |
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69 | ; |
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70 | @common |
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71 | ;------------------------------------------------------------ |
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72 | ; filename |
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73 | ;------------------------------------------------------------ |
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74 | fullname = isafile(filename = namefile, IODIRECTORY = iodir, _extra = ex) |
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75 | IF size(fullname, /type) NE 7 THEN return, -1 |
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76 | ;------------------------------------------------------------ |
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77 | ; open file |
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78 | ;------------------------------------------------------------ |
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79 | cdfid = ncdf_open(fullname) |
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80 | ;------------------------------------------------------------ |
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81 | ; What contains the file? |
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82 | ;------------------------------------------------------------ |
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83 | inside = ncdf_inquire(cdfid) ; |
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84 | ;------------------------------------------------------------ |
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85 | ; name of all dimensions |
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86 | ;------------------------------------------------------------ |
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87 | namedim = strarr(inside.ndims) |
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88 | for dimiq = 0, inside.ndims-1 do begin |
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89 | ncdf_diminq, cdfid, dimiq, tmpname, value |
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90 | namedim[dimiq] = strlowcase(tmpname) |
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91 | ENDFOR |
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92 | ;------------------------------------------------------------ |
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93 | ; x/y dimensions id |
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94 | ;------------------------------------------------------------ |
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95 | ncdf_getaxis, cdfid, dimidx, dimidy, _extra = ex |
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96 | ;------------------------------------------------------------ |
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97 | ; name of all variables |
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98 | ;------------------------------------------------------------ |
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99 | ; we keep only the variables containing at least x, y and time dimension (if existing...) |
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100 | namevar = strarr(inside.nvars) |
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101 | for varid = 0, inside.nvars-1 do begin |
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102 | invar = ncdf_varinq(cdfid, varid) ; what contains the variable? |
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103 | if (inter(invar.dim, dimidx))[0] NE -1 AND $ |
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104 | (inter(invar.dim, dimidy))[0] NE -1 AND $ |
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105 | ((where(invar.dim EQ inside.recdim))[0] NE -1 OR inside.recdim EQ -1) $ |
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106 | THEN namevar[varid] = invar.name |
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107 | ENDFOR |
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108 | namevar = namevar[where(namevar NE '')] |
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109 | ;------------------------------------------------------------ |
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110 | ; find vargrid for each selected variable... |
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111 | ;------------------------------------------------------------ |
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112 | listgrid = strarr(n_elements(namevar)) |
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113 | ; default definitions |
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114 | IF keyword_set(grid) THEN vargrid = strupcase(grid) ELSE vargrid = 'T' |
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115 | ; look for values of vargrid for each variable |
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116 | IF finite(glamu[0]) EQ 1 AND NOT keyword_set(grid) THEN BEGIN |
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117 | ; for each variable, look if we in one of the case corresponding to ROMS conventions? |
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118 | FOR i = 0, n_elements(namevar)-1 do begin |
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119 | invar = ncdf_varinq(cdfid, namevar[i]) |
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120 | tmpnm = namedim[invar.dim] |
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121 | ; are we in one of the case corresponding to ROMS conventions? |
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122 | CASE 1 OF |
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123 | tmpnm[2 <(invar.ndims-1)] EQ 's_w':vargrid = 'W' |
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124 | tmpnm[0] EQ 'xi_rho' AND tmpnm[1] EQ 'eta_rho':listgrid[i] = 'T' |
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125 | tmpnm[0] EQ 'xi_u' AND tmpnm[1] EQ 'eta_u' :listgrid[i] = 'U' |
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126 | tmpnm[0] EQ 'xi_v' AND tmpnm[1] EQ 'eta_v' :listgrid[i] = 'V' |
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127 | tmpnm[0] EQ 'xi_psi' AND tmpnm[1] EQ 'eta_psi':listgrid[i] = 'F' |
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128 | tmpnm[0] EQ 'xi_rho' AND tmpnm[1] EQ 'eta_v' :listgrid[i] = 'V' |
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129 | tmpnm[0] EQ 'xi_u' AND tmpnm[1] EQ 'eta_rho':listgrid[i] = 'U' |
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130 | tmpnm[0] EQ 'xi_u' AND tmpnm[1] EQ 'eta_v' :listgrid[i] = 'F' |
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131 | ELSE: |
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132 | ENDCASE |
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133 | ENDFOR |
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134 | empty = where(listgrid EQ '') |
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135 | IF empty[0] NE -1 THEN BEGIN |
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136 | ; could we define the grid type from the file name?? |
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137 | pattern = ['GRID.', 'GRID_', 'GRID', 'UPID_', '30ID_'] |
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138 | gdtype = ['T', 'U', 'V', 'W', 'F'] |
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139 | fnametest = strupcase(fullname) |
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140 | FOR i = 0, n_elements(pattern)-1 DO BEGIN |
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141 | FOR j = 0, n_elements(gdtype)-1 DO BEGIN |
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142 | substr = pattern[i]+gdtype[j] |
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143 | pos = strpos(fnametest, substr) |
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144 | IF pos NE -1 THEN $ |
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145 | vargrid = strmid(fnametest, pos+strlen(substr)-1, 1) |
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146 | ENDFOR |
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147 | ENDFOR |
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148 | listgrid[empty] = vargrid |
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149 | ENDIF |
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150 | ENDIF ELSE listgrid[*] = vargrid |
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151 | ;------------------------------------------------------------ |
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152 | ; time axis |
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153 | ;------------------------------------------------------------ |
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154 | date0fk = date2jul(19000101) |
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155 | IF inside.recdim EQ -1 THEN BEGIN |
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156 | jpt = 1 |
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157 | time = date0fk |
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158 | fakecal = 1 |
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159 | ENDIF ELSE BEGIN |
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160 | ncdf_diminq, cdfid, inside.recdim, timedimname, jpt |
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161 | ; we look for the variable containing the time axis |
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162 | ; we look for the first variable having for only dimension inside.recdim |
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163 | varid = 0 |
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164 | repeat BEGIN |
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165 | IF varid LT inside.nvars THEN BEGIN |
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166 | invar = ncdf_varinq(cdfid, varid) |
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167 | varid = varid+1 |
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168 | ENDIF ELSE varid = 0 |
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169 | endrep until (n_elements(invar.dim) EQ 1 AND invar.dim[0] EQ inside.recdim) OR (varid EQ 0) |
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170 | varid = varid-1 |
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171 | ; |
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172 | CASE 1 OF |
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173 | varid EQ -1:BEGIN |
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174 | dummy = report('the file '+fullname+' has no time axis.!C we create a fake calendar ...') |
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175 | fakecal = 1 |
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176 | time = date0fk + lindgen(1>jpt) |
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177 | END |
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178 | invar.natts EQ 0:BEGIN |
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179 | dummy = report('the variable '+invar.name+' has no attribut.!C we create a fake calendar ...') |
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180 | fakecal = 1 |
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181 | time = date0fk + lindgen(1>jpt) |
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182 | END |
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183 | ELSE:BEGIN |
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184 | ; |
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185 | ; we want to know which attributes are attached to the time variable... |
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186 | ; |
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187 | attnames = strarr(invar.natts) |
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188 | for attiq = 0, invar.natts-1 do attnames[attiq] = ncdf_attname(cdfid, varid, attiq) |
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189 | if (where(attnames EQ 'units'))[0] EQ -1 then BEGIN |
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190 | dummy = report('Attribut ''units'' not found for the variable '+invar.name+'!C we create a fake calendar ...') |
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191 | fakecal = 1 |
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192 | time = date0fk + lindgen(1>jpt) |
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193 | ENDIF ELSE BEGIN |
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194 | ; we read the time axis |
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195 | ncdf_varget, cdfid, varid, time |
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196 | time = double(time) |
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197 | ncdf_attget, cdfid, varid, 'units', value |
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198 | ; time_counter:units = "seconds since 0001-01-01 00:00:00" ; |
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199 | ; time_counter:units = "hours since 0001-01-01 00:00:00" ; |
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200 | ; time_counter:units = "days since 1979-01-01 00:00:00" ; |
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201 | ; time_counter:units = "months since 1979-01-01 00:00:00" ; |
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202 | ; time_counter:units = "years since 1979-01-01 00:00:00" ; |
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203 | value = strtrim(strcompress(string(value)), 2) |
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204 | mots = str_sep(value, ' ') |
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205 | unite = mots[0] |
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206 | unite = strlowcase(unite) |
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207 | IF strpos(unite, 's', strlen(unite)-1) NE -1 THEN unite = strmid(unite, 0, strlen(unite)-1) |
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208 | IF strpos(unite, 'julian_') NE -1 THEN unite = strmid(unite, 7) |
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209 | err = 0 |
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210 | IF unite NE 'second' AND unite NE 'hour' AND unite NE 'day' $ |
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211 | AND unite NE 'month' AND unite NE 'year' THEN BEGIN |
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212 | dummy = report('time units does not start with seconds/hours/days/months/years') |
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213 | err = 1 |
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214 | ENDIF |
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215 | IF stregex(value, '[^ ]* since ([0-9]){1,4}-([0-9]){1,2}-([0-9]){1,2}.*', /boolean) EQ 0 THEN BEGIN |
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216 | dummy = report('attribut units of time has not the good format: [^ ]* since ([0-9]){1,4}-([0-9]){1,2}-([0-9]){1,2}.*') |
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217 | err = 1 |
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218 | ENDIF |
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219 | IF err GT 0 THEN BEGIN |
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220 | fakecal = 1 |
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221 | time = date0fk + lindgen(1>jpt) |
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222 | ENDIF ELSE BEGIN |
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223 | debut = str_sep(mots[2], '-') |
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224 | ; |
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225 | ; now we try to find the attribut called calendar... |
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226 | ; the attribute "calendar" exists? |
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227 | ; If no, we suppose that the calendar is gregorian calendar |
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228 | ; |
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229 | if (where(attnames EQ 'calendar'))[0] NE -1 then BEGIN |
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230 | ncdf_attget, cdfid, varid, 'calendar', value |
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231 | value = string(value) |
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232 | CASE value OF |
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233 | 'noleap':key_caltype = 'noleap' |
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234 | '360d':key_caltype = '360d' |
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235 | 'greg':IF n_elements(key_caltype) EQ 0 THEN key_caltype = 'greg' |
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236 | ELSE:BEGIN |
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237 | ; notused = report('Unknown calendar: '+value+', we use greg calendar.') |
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238 | key_caltype = 'greg' |
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239 | END |
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240 | ENDCASE |
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241 | ENDIF ELSE BEGIN |
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242 | ; notused = report('Unknown calendar, we use '+key_caltype+' calendar.') |
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243 | IF n_elements(key_caltype) EQ 0 THEN key_caltype = 'greg' |
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244 | ENDELSE |
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245 | ; |
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246 | ; BEWARE we have to get back the calendar attribute and ajust time by consequence... |
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247 | ; |
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248 | ; |
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249 | ; We pass time in IDL julian days |
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250 | ; |
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251 | case unite of |
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252 | 'second':time = julday(debut[1], debut[2], debut[0])+time/86400.d |
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253 | 'hour':time = julday(debut[1], debut[2], debut[0])+time/24.d |
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254 | 'day':time = julday(debut[1], debut[2], debut[0])+time |
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255 | 'month':BEGIN |
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256 | if total(fix(time) NE time) NE 0 then $ ; we switch to days with 30d/m |
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257 | time = julday(debut[1], debut[2], debut[0])+round(time*30) $ |
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258 | ELSE for t = 0, n_elements(time)-1 DO $ |
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259 | time[t] = julday(debut[1]+time[t], debut[2], debut[0]) |
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260 | END |
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261 | 'year':BEGIN |
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262 | if total(fix(time) NE time) NE 0 then $ ; we switch to days with 365d/y |
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263 | time = julday(debut[1], debut[2], debut[0])+round(time*365) $ |
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264 | ELSE for t = 0, n_elements(time)-1 do $ |
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265 | time[t] = julday(debut[1], debut[2], debut[0]+time[t]) |
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266 | END |
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267 | ENDCASE |
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268 | ; |
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269 | ; high frequency calendar: more than one element per day |
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270 | IF max(histogram([long(time-time[0])])) GT 1 THEN fakecal = 1 ELSE fakecal = 0 |
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271 | date0fk = date2jul(19000101) |
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272 | IF keyword_set(fakecal) THEN time = date0fk+lindgen(1>jpt) $ |
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273 | ELSE time = long(time) |
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274 | ; |
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275 | ENDELSE |
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276 | ENDELSE |
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277 | END |
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278 | ENDCASE |
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279 | ENDELSE |
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280 | ;------------------------------------------------------------ |
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281 | ncdf_close, cdfid |
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282 | ;------------------------------------------------------------ |
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283 | return, {filename:fullname, time_counter:time, listvar:namevar $ |
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284 | , listgrid:strupcase(listgrid), caltype:key_caltype $ |
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285 | , fakecal:date0fk*fakecal} |
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286 | end |
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