[150] | 1 | ;+ |
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| 2 | ; @file_comments |
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[2] | 3 | ; |
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[150] | 4 | ; |
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| 5 | ; @categories |
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| 6 | ; |
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| 7 | ; |
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| 8 | ; @param NAMEFILE |
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| 9 | ; |
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| 10 | ; |
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[221] | 11 | ; @keyword GRID {default='T'}{type=scalar string} |
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| 12 | ; Used to specify on which grid type are located the data |
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[150] | 13 | ; |
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| 14 | ; @keyword _EXTRA |
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[221] | 15 | ; Used to pass your keywords to isafile and ncdf_getaxis |
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[150] | 16 | ; |
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| 17 | ; @returns |
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| 18 | ; |
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| 19 | ; |
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| 20 | ; @uses |
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| 21 | ; |
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| 22 | ; |
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| 23 | ; @restrictions |
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| 24 | ; |
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| 25 | ; |
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| 26 | ; @examples |
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| 27 | ; |
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| 28 | ; |
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| 29 | ; @history |
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| 30 | ; |
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| 31 | ; |
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| 32 | ; @version |
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| 33 | ; $Id$ |
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| 34 | ; |
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| 35 | ; @todo |
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| 36 | ; seb : I don't know what to do with that... |
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| 37 | ; |
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| 38 | ;- |
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| 39 | ; |
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[2] | 40 | ; liste des presupposes: |
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| 41 | ; 1) le fichier a lire est un fichier netcdf |
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| 42 | ; 2) le nom de ce fichier finit |
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| 43 | ; par U.nc, V.nc, W.nc, T.nc ou F.nc, la lettre avant le |
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| 44 | ; nc designant la grille a laquelle se rapporte la champ. |
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| 45 | ; Si tel n''est pas la cas, le fichier est attribue a la grille |
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| 46 | ; T. |
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| 47 | ; 3) ce fichier contient une dimension infinie qui doit etre |
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| 48 | ; celle qui se rapporte au temps et au mois 2 autres dimensions |
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[69] | 49 | ; dont les noms sont 'x','lon...','xi_...' et 'y','lat...' ou |
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| 50 | ; 'eta_...' ou bien en majuscule. |
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[2] | 51 | ; 4) il doit exiter ds ce fichier une unique variable n''ayant |
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| 52 | ; qu''une dimension et etant la dimension temporelle. cette |
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| 53 | ; variable sera prise comme axe des temps. Rq: si plusieurs |
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| 54 | ; variables verifient ces criteres on considere la premiere |
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| 55 | ; variable |
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| 56 | ; 5) Cette variable axe des temps doit contenir l''attribut |
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| 57 | ; 'units'qui doit etre ecrit suivant la syntaxe: |
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| 58 | ; "seconds since 0001-01-01 00:00:00" |
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| 59 | ; "hours since 0001-01-01 00:00:00" |
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| 60 | ; "days since 1979-01-01 00:59:59" |
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| 61 | ; "months since 1979-01-01 00:59:59" |
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| 62 | ; "years since 1979-01-01 00:59:59" |
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| 63 | ; |
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| 64 | ; je crois que c''est tout! |
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| 65 | ; |
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[69] | 66 | ; GRID='[UTVWF]' to specify the type of grid. Defaut is (1) |
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| 67 | ; based on the name of the file if the file ends by |
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| 68 | ; GRID[._][TUVFW].NC (not case sensible) or (2) T if case (1) |
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| 69 | ; is not found. |
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[2] | 70 | ; |
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| 71 | ;------------------------------------------------------------ |
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[69] | 72 | FUNCTION scanfile, namefile, GRID = GRID, _extra = ex |
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[114] | 73 | ; |
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| 74 | compile_opt idl2, strictarrsubs |
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| 75 | ; |
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[2] | 76 | @common |
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| 77 | ;------------------------------------------------------------ |
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[69] | 78 | ; filename |
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[2] | 79 | ;------------------------------------------------------------ |
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[69] | 80 | fullname = isafile(filename = namefile, IODIRECTORY = iodir, _extra = ex) |
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[221] | 81 | IF size(fullname, /type) NE 7 THEN return, -1 |
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[2] | 82 | ;------------------------------------------------------------ |
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[69] | 83 | ; open file |
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[2] | 84 | ;------------------------------------------------------------ |
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[69] | 85 | cdfid = ncdf_open(fullname) |
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[2] | 86 | ;------------------------------------------------------------ |
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[69] | 87 | ; What contains the file? |
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[2] | 88 | ;------------------------------------------------------------ |
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[221] | 89 | inside = ncdf_inquire(cdfid) ; |
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[2] | 90 | ;------------------------------------------------------------ |
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[69] | 91 | ; name of all dimensions |
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[2] | 92 | ;------------------------------------------------------------ |
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[221] | 93 | namedim = strarr(inside.ndims) |
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| 94 | for dimiq = 0, inside.ndims-1 do begin |
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[69] | 95 | ncdf_diminq, cdfid, dimiq, tmpname, value |
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| 96 | namedim[dimiq] = strlowcase(tmpname) |
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[49] | 97 | ENDFOR |
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[69] | 98 | ;------------------------------------------------------------ |
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[221] | 99 | ; x/y dimensions id |
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| 100 | ;------------------------------------------------------------ |
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| 101 | ncdf_getaxis, cdfid, dimidx, dimidy, _extra = ex |
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| 102 | ;------------------------------------------------------------ |
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[69] | 103 | ; name of all variables |
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| 104 | ;------------------------------------------------------------ |
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| 105 | ; we keep only the variables containing at least x, y and time dimension (if existing...) |
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[221] | 106 | namevar = strarr(inside.nvars) |
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| 107 | for varid = 0, inside.nvars-1 do begin |
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[69] | 108 | invar = ncdf_varinq(cdfid, varid) ; what contains the variable? |
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[172] | 109 | if (inter(invar.dim, dimidx))[0] NE -1 AND $ |
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| 110 | (inter(invar.dim, dimidy))[0] NE -1 AND $ |
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[221] | 111 | ((where(invar.dim EQ inside.recdim))[0] NE -1 OR inside.recdim EQ -1) $ |
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[69] | 112 | THEN namevar[varid] = invar.name |
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[49] | 113 | ENDFOR |
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| 114 | namevar = namevar[where(namevar NE '')] |
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[2] | 115 | ;------------------------------------------------------------ |
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[172] | 116 | ; find vargrid for each selected variable... |
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| 117 | ;------------------------------------------------------------ |
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| 118 | listgrid = strarr(n_elements(namevar)) |
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| 119 | ; default definitions |
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| 120 | IF keyword_set(grid) THEN vargrid = strupcase(grid) ELSE vargrid = 'T' |
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| 121 | ; look for values of vargrid for each variable |
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| 122 | IF finite(glamu[0]) EQ 1 AND NOT keyword_set(grid) THEN BEGIN |
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| 123 | ; for each variable, look if we in one of the case corresponding to ROMS conventions? |
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| 124 | FOR i = 0, n_elements(namevar)-1 do begin |
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| 125 | invar = ncdf_varinq(cdfid, namevar[i]) |
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| 126 | tmpnm = namedim[invar.dim] |
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| 127 | ; are we in one of the case corresponding to ROMS conventions? |
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| 128 | CASE 1 OF |
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| 129 | tmpnm[2 <(invar.ndims-1)] EQ 's_w':vargrid = 'W' |
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| 130 | tmpnm[0] EQ 'xi_rho' AND tmpnm[1] EQ 'eta_rho':listgrid[i] = 'T' |
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| 131 | tmpnm[0] EQ 'xi_u' AND tmpnm[1] EQ 'eta_u' :listgrid[i] = 'U' |
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| 132 | tmpnm[0] EQ 'xi_v' AND tmpnm[1] EQ 'eta_v' :listgrid[i] = 'V' |
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| 133 | tmpnm[0] EQ 'xi_psi' AND tmpnm[1] EQ 'eta_psi':listgrid[i] = 'F' |
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| 134 | tmpnm[0] EQ 'xi_rho' AND tmpnm[1] EQ 'eta_v' :listgrid[i] = 'V' |
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| 135 | tmpnm[0] EQ 'xi_u' AND tmpnm[1] EQ 'eta_rho':listgrid[i] = 'U' |
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| 136 | tmpnm[0] EQ 'xi_u' AND tmpnm[1] EQ 'eta_v' :listgrid[i] = 'F' |
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| 137 | ELSE: |
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| 138 | ENDCASE |
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| 139 | ENDFOR |
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| 140 | empty = where(listgrid EQ '') |
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| 141 | IF empty[0] NE -1 THEN BEGIN |
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| 142 | ; could we define the grid type from the file name?? |
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| 143 | pattern = ['GRID.', 'GRID_', 'GRID', 'UPID_', '30ID_'] |
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| 144 | gdtype = ['T', 'U', 'V', 'W', 'F'] |
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| 145 | fnametest = strupcase(fullname) |
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| 146 | FOR i = 0, n_elements(pattern)-1 DO BEGIN |
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| 147 | FOR j = 0, n_elements(gdtype)-1 DO BEGIN |
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| 148 | substr = pattern[i]+gdtype[j] |
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| 149 | pos = strpos(fnametest, substr) |
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| 150 | IF pos NE -1 THEN $ |
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| 151 | vargrid = strmid(fnametest, pos+strlen(substr)-1, 1) |
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| 152 | ENDFOR |
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| 153 | ENDFOR |
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| 154 | listgrid[empty] = vargrid |
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| 155 | ENDIF |
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| 156 | ENDIF ELSE listgrid[*] = vargrid |
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| 157 | ;------------------------------------------------------------ |
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[69] | 158 | ; time axis |
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[2] | 159 | ;------------------------------------------------------------ |
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[69] | 160 | date0fk = date2jul(19000101) |
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[221] | 161 | IF inside.recdim EQ -1 THEN BEGIN |
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[69] | 162 | jpt = 1 |
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| 163 | time = date0fk |
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| 164 | fakecal = 1 |
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| 165 | ENDIF ELSE BEGIN |
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[221] | 166 | ncdf_diminq, cdfid, inside.recdim, timedimname, jpt |
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[69] | 167 | ; we look for the variable containing the time axis |
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[221] | 168 | ; we look for the first variable having for only dimension inside.recdim |
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[69] | 169 | varid = 0 |
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| 170 | repeat BEGIN |
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[221] | 171 | IF varid LT inside.nvars THEN BEGIN |
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[167] | 172 | invar = ncdf_varinq(cdfid, varid) |
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| 173 | varid = varid+1 |
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| 174 | ENDIF ELSE varid = 0 |
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[221] | 175 | endrep until (n_elements(invar.dim) EQ 1 AND invar.dim[0] EQ inside.recdim) OR (varid EQ 0) |
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[69] | 176 | varid = varid-1 |
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[49] | 177 | ; |
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[69] | 178 | CASE 1 OF |
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| 179 | varid EQ -1:BEGIN |
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| 180 | dummy = report('the file '+fullname+' has no time axis.!C we create a fake calendar ...') |
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| 181 | fakecal = 1 |
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[181] | 182 | time = date0fk + lindgen(1>jpt) |
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[69] | 183 | END |
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| 184 | invar.natts EQ 0:BEGIN |
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| 185 | dummy = report('the variable '+invar.name+' has no attribut.!C we create a fake calendar ...') |
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| 186 | fakecal = 1 |
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[181] | 187 | time = date0fk + lindgen(1>jpt) |
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[69] | 188 | END |
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| 189 | ELSE:BEGIN |
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[49] | 190 | ; |
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[69] | 191 | ; we want to know which attributes are attached to the time variable... |
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| 192 | ; |
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| 193 | attnames = strarr(invar.natts) |
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| 194 | for attiq = 0, invar.natts-1 do attnames[attiq] = ncdf_attname(cdfid, varid, attiq) |
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| 195 | if (where(attnames EQ 'units'))[0] EQ -1 then BEGIN |
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[167] | 196 | dummy = report('Attribut ''units'' not found for the variable '+invar.name+'!C we create a fake calendar ...') |
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[69] | 197 | fakecal = 1 |
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[181] | 198 | time = date0fk + lindgen(1>jpt) |
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[69] | 199 | ENDIF ELSE BEGIN |
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[150] | 200 | ; we read the time axis |
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[69] | 201 | ncdf_varget, cdfid, varid, time |
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| 202 | time = double(time) |
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| 203 | ncdf_attget, cdfid, varid, 'units', value |
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[2] | 204 | ; time_counter:units = "seconds since 0001-01-01 00:00:00" ; |
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| 205 | ; time_counter:units = "hours since 0001-01-01 00:00:00" ; |
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| 206 | ; time_counter:units = "days since 1979-01-01 00:00:00" ; |
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| 207 | ; time_counter:units = "months since 1979-01-01 00:00:00" ; |
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| 208 | ; time_counter:units = "years since 1979-01-01 00:00:00" ; |
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[69] | 209 | value = strtrim(strcompress(string(value)), 2) |
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| 210 | mots = str_sep(value, ' ') |
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| 211 | unite = mots[0] |
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[198] | 212 | unite = strlowcase(unite) |
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| 213 | IF strpos(unite, 's', strlen(unite)-1) NE -1 THEN unite = strmid(unite, 0, strlen(unite)-1) |
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| 214 | IF strpos(unite, 'julian_') NE -1 THEN unite = strmid(unite, 7) |
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[172] | 215 | err = 0 |
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[198] | 216 | IF unite NE 'second' AND unite NE 'hour' AND unite NE 'day' $ |
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| 217 | AND unite NE 'month' AND unite NE 'year' THEN BEGIN |
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[172] | 218 | dummy = report('time units does not start with seconds/hours/days/months/years') |
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| 219 | err = 1 |
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| 220 | ENDIF |
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[199] | 221 | 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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| 222 | 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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[198] | 223 | err = 1 |
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| 224 | ENDIF |
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[172] | 225 | IF err GT 0 THEN BEGIN |
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| 226 | fakecal = 1 |
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[181] | 227 | time = date0fk + lindgen(1>jpt) |
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[172] | 228 | ENDIF ELSE BEGIN |
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| 229 | debut = str_sep(mots[2], '-') |
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[2] | 230 | ; |
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[49] | 231 | ; now we try to find the attribut called calendar... |
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| 232 | ; the the attribute "calendar" exists? |
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| 233 | ; If no, we suppose that the calendar is gregorian calendar |
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[2] | 234 | ; |
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[172] | 235 | if (where(attnames EQ 'calendar'))[0] NE -1 then BEGIN |
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| 236 | ncdf_attget, cdfid, varid, 'calendar', value |
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| 237 | value = string(value) |
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| 238 | CASE value OF |
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| 239 | 'noleap':key_caltype = 'noleap' |
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| 240 | '360d':key_caltype = '360d' |
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| 241 | 'greg':IF n_elements(key_caltype) EQ 0 THEN key_caltype = 'greg' |
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| 242 | ELSE:BEGIN |
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[49] | 243 | ; notused = report('Unknown calendar: '+value+', we use greg calendar.') |
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[172] | 244 | key_caltype = 'greg' |
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| 245 | END |
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| 246 | ENDCASE |
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| 247 | ENDIF ELSE BEGIN |
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[49] | 248 | ; notused = report('Unknown calendar, we use '+key_caltype+' calendar.') |
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[172] | 249 | IF n_elements(key_caltype) EQ 0 THEN key_caltype = 'greg' |
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| 250 | ENDELSE |
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[49] | 251 | ; |
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[167] | 252 | ; BEWARE we have to get back the calendar attribute and ajust time by consequence... |
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[2] | 253 | ; |
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| 254 | ; |
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[167] | 255 | ; We pass time in IDL julian days |
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[2] | 256 | ; |
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[172] | 257 | case unite of |
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| 258 | 'second':time = julday(debut[1], debut[2], debut[0])+time/86400.d |
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| 259 | 'hour':time = julday(debut[1], debut[2], debut[0])+time/24.d |
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| 260 | 'day':time = julday(debut[1], debut[2], debut[0])+time |
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| 261 | 'month':BEGIN |
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| 262 | if total(fix(time) NE time) NE 0 then $ ; we switch to days with 30d/m |
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| 263 | time = julday(debut[1], debut[2], debut[0])+round(time*30) $ |
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| 264 | ELSE for t = 0, n_elements(time)-1 DO $ |
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| 265 | time[t] = julday(debut[1]+time[t], debut[2], debut[0]) |
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| 266 | END |
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| 267 | 'year':BEGIN |
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| 268 | if total(fix(time) NE time) NE 0 then $ ; we switch to days with 365d/y |
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| 269 | time = julday(debut[1], debut[2], debut[0])+round(time*365) $ |
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| 270 | ELSE for t = 0, n_elements(time)-1 do $ |
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| 271 | time[t] = julday(debut[1], debut[2], debut[0]+time[t]) |
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| 272 | END |
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| 273 | ENDCASE |
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[69] | 274 | ; |
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| 275 | ; high frequency calendar: more than one element per day |
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[172] | 276 | IF max(histogram([long(time-time[0])])) GT 1 THEN fakecal = 1 ELSE fakecal = 0 |
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| 277 | date0fk = date2jul(19000101) |
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[181] | 278 | IF keyword_set(fakecal) THEN time = date0fk+lindgen(1>jpt) $ |
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[172] | 279 | ELSE time = long(time) |
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[69] | 280 | ; |
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[172] | 281 | ENDELSE |
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[69] | 282 | ENDELSE |
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| 283 | END |
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| 284 | ENDCASE |
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| 285 | ENDELSE |
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[2] | 286 | ;------------------------------------------------------------ |
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[69] | 287 | ncdf_close, cdfid |
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| 288 | ;------------------------------------------------------------ |
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| 289 | return, {filename:fullname, time_counter:time, listvar:namevar $ |
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| 290 | , listgrid:strupcase(listgrid), caltype:key_caltype $ |
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| 291 | , fakecal:date0fk*fakecal} |
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[2] | 292 | end |
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