[2] | 1 | ; |
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| 2 | ; liste des presupposes: |
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| 3 | ; 1) le fichier a lire est un fichier netcdf |
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| 4 | ; 2) le nom de ce fichier finit |
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| 5 | ; par U.nc, V.nc, W.nc, T.nc ou F.nc, la lettre avant le |
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| 6 | ; nc designant la grille a laquelle se rapporte la champ. |
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| 7 | ; Si tel n''est pas la cas, le fichier est attribue a la grille |
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| 8 | ; T. |
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| 9 | ; 3) ce fichier contient une dimension infinie qui doit etre |
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| 10 | ; celle qui se rapporte au temps et au mois 2 autres dimensions |
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[69] | 11 | ; dont les noms sont 'x','lon...','xi_...' et 'y','lat...' ou |
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| 12 | ; 'eta_...' ou bien en majuscule. |
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[2] | 13 | ; 4) il doit exiter ds ce fichier une unique variable n''ayant |
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| 14 | ; qu''une dimension et etant la dimension temporelle. cette |
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| 15 | ; variable sera prise comme axe des temps. Rq: si plusieurs |
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| 16 | ; variables verifient ces criteres on considere la premiere |
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| 17 | ; variable |
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| 18 | ; 5) Cette variable axe des temps doit contenir l''attribut |
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| 19 | ; 'units'qui doit etre ecrit suivant la syntaxe: |
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| 20 | ; "seconds since 0001-01-01 00:00:00" |
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| 21 | ; "hours since 0001-01-01 00:00:00" |
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| 22 | ; "days since 1979-01-01 00:59:59" |
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| 23 | ; "months since 1979-01-01 00:59:59" |
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| 24 | ; "years since 1979-01-01 00:59:59" |
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| 25 | ; |
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| 26 | ; je crois que c''est tout! |
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| 27 | ; |
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[69] | 28 | ; GRID='[UTVWF]' to specify the type of grid. Defaut is (1) |
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| 29 | ; based on the name of the file if the file ends by |
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| 30 | ; GRID[._][TUVFW].NC (not case sensible) or (2) T if case (1) |
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| 31 | ; is not found. |
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[2] | 32 | ; |
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| 33 | ;------------------------------------------------------------ |
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[69] | 34 | FUNCTION scanfile, namefile, GRID = GRID, _extra = ex |
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[2] | 35 | @common |
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| 36 | ;------------------------------------------------------------ |
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[49] | 37 | res = -1 |
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[2] | 38 | ;------------------------------------------------------------ |
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[69] | 39 | ; filename |
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[2] | 40 | ;------------------------------------------------------------ |
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[69] | 41 | fullname = isafile(filename = namefile, IODIRECTORY = iodir, _extra = ex) |
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[2] | 42 | ;------------------------------------------------------------ |
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[69] | 43 | ; open file |
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[2] | 44 | ;------------------------------------------------------------ |
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[69] | 45 | cdfid = ncdf_open(fullname) |
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[2] | 46 | ;------------------------------------------------------------ |
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[69] | 47 | ; What contains the file? |
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[2] | 48 | ;------------------------------------------------------------ |
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[69] | 49 | infile = ncdf_inquire(cdfid) ; |
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[49] | 50 | ; find vargrid ... |
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[69] | 51 | IF keyword_set(grid) THEN vargrid = strupcase(grid) ELSE BEGIN |
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| 52 | vargrid = 'T' ; default definition |
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| 53 | IF finite(glamu[0]) EQ 1 THEN BEGIN |
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| 54 | pattern = ['GRID.', 'GRID_', 'GRID', 'UPID_', '30ID_'] |
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| 55 | gdtype = ['T', 'U', 'V', 'W', 'F'] |
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| 56 | fnametest = strupcase(fullname) |
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| 57 | FOR i = 0, n_elements(pattern)-1 DO BEGIN |
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| 58 | FOR j = 0, n_elements(gdtype)-1 DO BEGIN |
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| 59 | substr = pattern[i]+gdtype[j] |
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| 60 | pos = strpos(fnametest, substr) |
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| 61 | IF pos NE -1 THEN $ |
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| 62 | vargrid = strmid(fnametest, pos+strlen(substr)-1, 1) |
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| 63 | ENDFOR |
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| 64 | ENDFOR |
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| 65 | ENDIF |
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| 66 | ENDELSE |
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[2] | 67 | ;------------------------------------------------------------ |
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[69] | 68 | ; name of all dimensions |
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[2] | 69 | ;------------------------------------------------------------ |
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[69] | 70 | namedim = strarr(infile.ndims) |
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| 71 | for dimiq = 0, infile.ndims-1 do begin |
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| 72 | ncdf_diminq, cdfid, dimiq, tmpname, value |
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| 73 | namedim[dimiq] = strlowcase(tmpname) |
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[49] | 74 | ENDFOR |
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[69] | 75 | ; we are looking for a x dimension... |
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| 76 | dimidx = where(namedim EQ 'x' OR strmid(namedim, 0, 3) EQ 'lon' OR strmid(namedim, 0, 3) EQ 'xi_' OR namedim EQ 'xt_i7_156') |
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| 77 | dimidx = dimidx[0] |
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| 78 | if dimidx EQ -1 then begin |
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| 79 | print, 'one of the dimensions must have the name: ''x'' or ''lon...'' or ''xi_...'' or ''xt_i7_156''' |
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[49] | 80 | stop |
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| 81 | endif |
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[69] | 82 | ; we are looking for a y dimension... |
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| 83 | dimidy = where(namedim EQ 'y' OR strmid(namedim, 0, 3) EQ 'lat' OR strmid(namedim, 4) EQ 'eta_' OR namedim EQ 'yt_j6_75') |
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| 84 | dimidy = dimidy[0] |
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| 85 | if dimidy EQ -1 then begin |
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| 86 | print, 'one of the dimensions must have the name: ''y'' or ''lat...'' or ''eta_...'' or ''yt_j6_75''' |
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[49] | 87 | stop |
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| 88 | endif |
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[69] | 89 | ;------------------------------------------------------------ |
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| 90 | ; name of all variables |
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| 91 | ;------------------------------------------------------------ |
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| 92 | ; we keep only the variables containing at least x, y and time dimension (if existing...) |
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| 93 | namevar = strarr(infile.nvars) |
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| 94 | for varid = 0, infile.nvars-1 do begin |
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| 95 | invar = ncdf_varinq(cdfid, varid) ; what contains the variable? |
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| 96 | if (where(invar.dim EQ dimidx))[0] NE -1 AND $ |
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| 97 | (where(invar.dim EQ dimidy))[0] NE -1 AND $ |
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| 98 | ((where(invar.dim EQ infile.recdim))[0] NE -1 OR infile.recdim EQ -1) $ |
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| 99 | THEN namevar[varid] = invar.name |
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[49] | 100 | ENDFOR |
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| 101 | namevar = namevar[where(namevar NE '')] |
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[69] | 102 | listgrid = replicate(vargrid, n_elements(namevar)) |
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[2] | 103 | ;------------------------------------------------------------ |
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[69] | 104 | ; time axis |
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[2] | 105 | ;------------------------------------------------------------ |
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[69] | 106 | date0fk = date2jul(19000101) |
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| 107 | IF infile.recdim EQ -1 THEN BEGIN |
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| 108 | jpt = 1 |
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| 109 | time = date0fk |
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| 110 | fakecal = 1 |
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| 111 | ENDIF ELSE BEGIN |
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| 112 | ncdf_diminq, cdfid, infile.recdim, timedimname, jpt |
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| 113 | ; we look for the variable containing the time axis |
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| 114 | ; we look for the first variable having for only dimension infile.recdim |
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| 115 | varid = 0 |
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| 116 | repeat BEGIN |
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| 117 | invar = ncdf_varinq(cdfid, varid) |
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| 118 | varid = varid+1 |
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| 119 | endrep until n_elements(invar.dim) EQ 1 AND invar.dim[0] EQ infile.recdim |
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| 120 | varid = varid-1 |
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[49] | 121 | ; |
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[69] | 122 | CASE 1 OF |
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| 123 | varid EQ -1:BEGIN |
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| 124 | dummy = report('the file '+fullname+' has no time axis.!C we create a fake calendar ...') |
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| 125 | fakecal = 1 |
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| 126 | time = date0fk + lindgen(jpt) |
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| 127 | END |
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| 128 | invar.natts EQ 0:BEGIN |
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| 129 | dummy = report('the variable '+invar.name+' has no attribut.!C we create a fake calendar ...') |
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| 130 | fakecal = 1 |
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| 131 | time = date0fk + lindgen(jpt) |
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| 132 | END |
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| 133 | ELSE:BEGIN |
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[49] | 134 | ; |
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[69] | 135 | ; we want to know which attributes are attached to the time variable... |
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| 136 | ; |
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| 137 | attnames = strarr(invar.natts) |
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| 138 | for attiq = 0, invar.natts-1 do attnames[attiq] = ncdf_attname(cdfid, varid, attiq) |
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| 139 | if (where(attnames EQ 'units'))[0] EQ -1 then BEGIN |
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| 140 | dummy = report('Attribut ''units'' not found for the variable '+varid.name+'!C we create a fake calendar ...') |
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| 141 | fakecal = 1 |
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| 142 | time = date0fk + lindgen(jpt) |
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| 143 | ENDIF ELSE BEGIN |
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[2] | 144 | ; on lit l''axe des temps |
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[69] | 145 | ncdf_varget, cdfid, varid, time |
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| 146 | time = double(time) |
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| 147 | ncdf_attget, cdfid, varid, 'units', value |
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[2] | 148 | ; time_counter:units = "seconds since 0001-01-01 00:00:00" ; |
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| 149 | ; time_counter:units = "hours since 0001-01-01 00:00:00" ; |
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| 150 | ; time_counter:units = "days since 1979-01-01 00:00:00" ; |
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| 151 | ; time_counter:units = "months since 1979-01-01 00:00:00" ; |
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| 152 | ; time_counter:units = "years since 1979-01-01 00:00:00" ; |
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[69] | 153 | value = strtrim(strcompress(string(value)), 2) |
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| 154 | mots = str_sep(value, ' ') |
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| 155 | unite = mots[0] |
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| 156 | debut = str_sep(mots[2], '-') |
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[2] | 157 | ; |
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[49] | 158 | ; now we try to find the attribut called calendar... |
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| 159 | ; the the attribute "calendar" exists? |
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| 160 | ; If no, we suppose that the calendar is gregorian calendar |
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[2] | 161 | ; |
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[69] | 162 | if (where(attnames EQ 'calendar'))[0] NE -1 then BEGIN |
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| 163 | ncdf_attget, cdfid, varid, 'calendar', value |
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| 164 | value = string(value) |
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| 165 | CASE value OF |
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| 166 | 'noleap':key_caltype = 'noleap' |
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| 167 | '360d':key_caltype = '360d' |
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| 168 | 'greg':IF n_elements(key_caltype) EQ 0 THEN key_caltype = 'greg' |
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| 169 | ELSE:BEGIN |
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[49] | 170 | ; notused = report('Unknown calendar: '+value+', we use greg calendar.') |
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[69] | 171 | key_caltype = 'greg' |
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| 172 | END |
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| 173 | ENDCASE |
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| 174 | ENDIF ELSE BEGIN |
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[49] | 175 | ; notused = report('Unknown calendar, we use '+key_caltype+' calendar.') |
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[69] | 176 | IF n_elements(key_caltype) EQ 0 THEN key_caltype = 'greg' |
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| 177 | ENDELSE |
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[49] | 178 | ; |
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| 179 | ; ATTENTION il faut recuperer l''attribut calendar et ajuster time en |
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[2] | 180 | ; consequense... |
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| 181 | ; |
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| 182 | ; |
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| 183 | ; on passe time en jour julien d''idl |
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| 184 | ; |
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[69] | 185 | unite = strlowcase(unite) |
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| 186 | IF strpos(unite, 's', strlen(unite)-1) NE -1 THEN unite = strmid(unite, 0, strlen(unite)-1) |
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| 187 | IF strpos(unite, 'julian_') NE -1 THEN unite = strmid(unite, 7) |
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| 188 | case unite of |
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| 189 | 'second':time = julday(debut[1], debut[2], debut[0])+time/86400.d |
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| 190 | 'hour':time = julday(debut[1], debut[2], debut[0])+time/24.d |
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| 191 | 'day':time = julday(debut[1], debut[2], debut[0])+time |
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| 192 | 'month':BEGIN |
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| 193 | if total(fix(time) NE time) NE 0 then $ ; we switch to days with 30d/m |
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| 194 | time = julday(debut[1], debut[2], debut[0])+round(time*30) $ |
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| 195 | ELSE for t = 0, n_elements(time)-1 DO $ |
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| 196 | time[t] = julday(debut[1]+time[t], debut[2], debut[0]) |
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| 197 | END |
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| 198 | 'year':BEGIN |
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| 199 | if total(fix(time) NE time) NE 0 then $ ; we switch to days with 365d/y |
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| 200 | time = julday(debut[1], debut[2], debut[0])+round(time*365) $ |
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| 201 | ELSE for t = 0, n_elements(time)-1 do $ |
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| 202 | time[t] = julday(debut[1], debut[2], debut[0]+time[t]) |
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| 203 | END |
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| 204 | ENDCASE |
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| 205 | ; |
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| 206 | ; high frequency calendar: more than one element per day |
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[74] | 207 | IF max(histogram([long(time-time[0])])) GT 1 THEN fakecal = 1 ELSE fakecal = 0 |
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[69] | 208 | date0fk = date2jul(19000101) |
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| 209 | IF keyword_set(fakecal) THEN time = date0fk+lindgen(jpt) $ |
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| 210 | ELSE time = long(time) |
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| 211 | ; |
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| 212 | ENDELSE |
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| 213 | END |
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| 214 | ENDCASE |
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| 215 | ENDELSE |
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[2] | 216 | ;------------------------------------------------------------ |
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[69] | 217 | ncdf_close, cdfid |
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| 218 | ;------------------------------------------------------------ |
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| 219 | return, {filename:fullname, time_counter:time, listvar:namevar $ |
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| 220 | , listgrid:strupcase(listgrid), caltype:key_caltype $ |
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| 221 | , fakecal:date0fk*fakecal} |
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[2] | 222 | end |
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