| 1 | ;------------------------------------------------------------ |
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| 2 | ;------------------------------------------------------------ |
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| 3 | ;------------------------------------------------------------ |
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| 4 | ;+ |
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| 5 | ; NAME: read_ncdf |
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| 6 | ; |
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| 7 | ; PURPOSE:fonction de lecture pour fichier net_cdf. |
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| 8 | ; Ce programme, est moins universel que ncdf_lec (il fait appelle au |
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| 9 | ; variables declarees dans common.pro) mais il est du cop bcp plus |
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| 10 | ; facile d''utilisation. Il prend en compte la declaration des |
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| 11 | ; differents zoom qui ont ete definis (ixminmesh...premierx...) la |
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| 12 | ; declaration de la variable key_shift... bref le resultat de |
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| 13 | ; read_ncdf peut dorectement etre utilise dans plt... |
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| 14 | ; C''est aussi ce programme qui est utilise par defaut dans mes |
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| 15 | ; widgets pour la partie lecture. |
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| 16 | ; |
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| 17 | ; CATEGORY:lecture de fichiers NetCdf |
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| 18 | ; |
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| 19 | ; CALLING SEQUENCE:res = read_ncdf(name,debut[,fin]) |
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| 20 | ; |
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| 21 | ; INPUTS: name: un string definissant le champ a lire. |
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| 22 | ; debut et fin: sont relatifs a l''axe des temps. Ce peut etre |
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| 23 | ; - 2 dates du type yyyymmdd et ds ce cas on selectionne les |
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| 24 | ; dates qui sont comprisent entre ces 2 dates. |
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| 25 | ; - 2 indices qui definissent entre quel et quel pas de temps |
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| 26 | ; on doit extraire la dimension temporelle. |
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| 27 | ; exp: ne sert a rien! |
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| 28 | ; |
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| 29 | ; KEYWORD PARAMETERS: utilisables hors du contexte des widgets |
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| 30 | ; |
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| 31 | ; BOITE: contient la boite sur laquelle on doit faire la |
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| 32 | ; lecture |
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| 33 | ; FILENAME: string contennant le nom du fichier |
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| 34 | ; IODIRECTORY: string contennant le nom du repertoire ds lequel |
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| 35 | ; se trouve le fichier |
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| 36 | ; TIMESTEP:activer pour specifier que debut et fin font |
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| 37 | ; reference a des indices de l''axe du temps et non pas a des |
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| 38 | ; dates. |
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| 39 | ; TOUT: activer si on veut lire le ficher sur l''ensemble du |
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| 40 | ; domaine sans tenir compte du sous domaine definit par boite |
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| 41 | ; ou lon1,lon2,lat1,lat2,prof1,prof2. |
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| 42 | ; NOSTRUCT: activer si on ne veut pas que read_ncdf retourne |
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| 43 | ; une structure mais uniquement le tableau se rapportant au |
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| 44 | ; champ. |
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| 45 | ; |
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| 46 | ; OUTPUTS:une stucture lisible par litchamp.pro ou un simple tableau |
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| 47 | ; si /NOSTRUCT est active |
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| 48 | ; |
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| 49 | ; COMMON BLOCKS:common.pro |
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| 50 | ; |
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| 51 | ; SIDE EFFECTS: |
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| 52 | ; |
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| 53 | ; RESTRICTIONS:le champ doit avoir une dimension temporelle |
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| 54 | ; |
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| 55 | ; EXAMPLE: |
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| 56 | ; |
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| 57 | ; MODIFICATION HISTORY:Sebastien Masson (smasson@lodyc.jussieu.fr) |
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| 58 | ; 15/10/1999 |
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| 59 | ;- |
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| 60 | ;------------------------------------------------------------ |
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| 61 | ;------------------------------------------------------------ |
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| 62 | ;------------------------------------------------------------ |
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| 63 | FUNCTION read_ncdf,name,debut,fin, pour_etre_compatible, BOITE=boite, FILENAME = filename $ |
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| 64 | , IODIRECTORY = iodirectory, PARENTIN = parentin, TIMESTEP = timestep $ |
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| 65 | , TOUT = tout, NOSTRUCT = nostruct, CONT_NOFILL = CONT_NOFILL, _EXTRA = ex |
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| 66 | @common |
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| 67 | ;------------------------------------------------------------ |
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| 68 | ; we find the filename. |
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| 69 | ;------------------------------------------------------------ |
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| 70 | ; is parent a valid widget ? |
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| 71 | if keyword_set(parentin) then BEGIN |
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| 72 | parent = long(parentin) |
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| 73 | parent = parent*widget_info(parent,/managed) |
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| 74 | ENDIF |
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| 75 | if n_elements(iodirectory) EQ 0 AND n_elements(iodir) NE 0 then iodirectory = iodir |
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| 76 | filename = isafile(filename = filename, IODIRECTORY = iodirectory) |
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| 77 | ;------------------------------------------------------------ |
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| 78 | ; ouverture du fichier nom |
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| 79 | ;------------------------------------------------------------ |
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| 80 | if size(filename, /type) NE 7 then $ |
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| 81 | return, report('read_ncdf cancelled') |
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| 82 | cdfid=ncdf_open(filename) |
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| 83 | contient=ncdf_inquire(cdfid) |
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| 84 | ;------------------------------------------------------------ |
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| 85 | ; we check if the variable name exists in the file. |
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| 86 | ;------------------------------------------------------------ |
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| 87 | if ncdf_varid(cdfid,name) EQ -1 then $ |
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| 88 | return, report('variable '+name+' !C not found in the file '+filename) |
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| 89 | ; |
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| 90 | varcontient=ncdf_varinq(cdfid,name) |
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| 91 | ;------------------------------------------------------------ |
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| 92 | ; check the time axis and the debut and fin dates |
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| 93 | ;------------------------------------------------------------ |
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| 94 | if n_elements(debut) EQ 0 then begin |
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| 95 | debut = 0 |
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| 96 | timestep = 1 |
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| 97 | endif |
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| 98 | if keyword_set(timestep) then begin |
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| 99 | premiertps = debut |
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| 100 | if n_elements(fin) NE 0 then derniertps = fin ELSE derniertps = premiertps |
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| 101 | jpt = derniertps-premiertps+1 |
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| 102 | time = lindgen(jpt) |
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| 103 | ENDIF ELSE BEGIN |
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| 104 | date1 = juldate(debut, /vraidate) |
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| 105 | if n_elements(fin) NE 0 then date2 = juldate(fin, /vraidate) ELSE date2 = date1 |
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| 106 | if keyword_set(parent) then BEGIN |
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| 107 | widget_control, parent, get_uvalue = top_uvalue |
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| 108 | filelist = extractatt(top_uvalue,'filelist') |
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| 109 | currentfile = (where(filelist EQ filename))[0] |
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| 110 | time = (*(extractatt(top_uvalue, 'fileparameters'))[currentfile]).time_counter |
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| 111 | premiertps = where(time EQ date1) & premiertps = premiertps[0] |
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| 112 | derniertps = where(time EQ date2) & derniertps = derniertps[0] |
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| 113 | ENDIF ELSE BEGIN |
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| 114 | ; we find the infinite dimension |
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| 115 | timedim = contient.recdim |
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| 116 | if timedim EQ -1 then $ |
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| 117 | return, report('the file '+filename+' as no infinite dimension. !C Use the TIMESTEP keyword') |
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| 118 | ; we find the FIRST time axis |
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| 119 | timeid = 0 |
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| 120 | repeat BEGIN ; tant que l''on a pas trouve une variable qui n''a qu'' |
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| 121 | ; une dimension: la dimension infinie |
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| 122 | timecontient=ncdf_varinq(cdfid,timeid) ; que contient la variable |
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| 123 | timeid = timeid+1 |
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| 124 | endrep until (n_elements(timecontient.dim) EQ 1 AND timecontient.dim[0] EQ contient.recdim) $ |
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| 125 | OR timeid EQ contient.nvars+1 |
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| 126 | ; |
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| 127 | if timeid EQ contient.nvars+1 then $ |
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| 128 | return, report('the file '+filename+' as no time axis variable. !C Use the TIMESTEP keyword') |
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| 129 | ; we must found the time origin of the julian calendar used in the |
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| 130 | ; time axis. |
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| 131 | ; does the attribut units exist for the variable time axis? |
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| 132 | timeid = timeid-1 |
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| 133 | if timecontient.natts EQ 0 then $ |
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| 134 | return, report('the variable '+timecontient.name+' has no attribut.!C Use the TIMESTEP keyword or add the attribut ''units'' to the variable') |
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| 135 | attnames = strarr(timecontient.natts) |
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| 136 | for attiq=0,timecontient.natts-1 do attnames[attiq]=ncdf_attname(cdfid,timeid,attiq) |
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| 137 | if (where(attnames EQ 'units'))[0] EQ -1 then $ |
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| 138 | return, report('Attribut ''units'' not found for the variable '+timecontient.name+' !C Use the TIMESTEP keyword') |
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| 139 | ncdf_attget,cdfid,timeid,'units',value |
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| 140 | ; |
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| 141 | ; time_counter:units = "seconds since 0001-01-01 00:00:00" ; |
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| 142 | ; time_counter:units = "hours since 0001-01-01 00:00:00" ; |
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| 143 | ; time_counter:units = "days since 1979-01-01 00:00:00" ; |
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| 144 | ; time_counter:units = "months since 1979-01-01 00:00:00" ; |
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| 145 | ; time_counter:units = "years since 1979-01-01 00:00:00" ; |
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| 146 | ; |
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| 147 | ; we decript the "units" attribut to find the time origin |
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| 148 | value = strtrim(strcompress(string(value)), 2) |
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| 149 | mots = str_sep(value, ' ') |
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| 150 | unite = mots[0] |
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| 151 | depart = str_sep(mots[2], '-') |
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| 152 | ncdf_varget, cdfid, timeid, time |
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| 153 | time = long(time) |
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| 154 | case strlowcase(unite) of |
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| 155 | 'seconds':time = julday(depart[1], depart[2], depart[0])+time/(long(24)*3600) |
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| 156 | 'hours':time = julday(depart[1], depart[2], depart[0])+time/long(24) |
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| 157 | 'days':time = julday(depart[1], depart[2], depart[0])+time |
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| 158 | 'months':BEGIN |
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| 159 | for t = 0, n_elements(time)-1 do begin |
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| 160 | time[t] = julday(depart[1]+time[t], depart[2], depart[0]) |
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| 161 | endfor |
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| 162 | END |
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| 163 | 'years':BEGIN |
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| 164 | for t = 0, n_elements(time)-1 do begin |
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| 165 | time[t] = julday(depart[1], depart[2], depart[0]+time[t]) |
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| 166 | endfor |
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| 167 | END |
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| 168 | ELSE:return, report('The "units" attribu of the time axis must be something like: !C "seconds since 0001-01-01 ..." !C "days since 1979-01-01 ..." !C "months since 1979-01-01 ..." !C "years since 1979-01-01 ..."') |
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| 169 | ENDCASE |
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| 170 | premiertps = where(time GE date1) & premiertps = premiertps[0] |
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| 171 | if premiertps EQ -1 THEN $ |
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| 172 | return, report('date 1: '+strtrim(date1, 1)+' is not found in the time axis.') |
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| 173 | derniertps = where(time LE date2) |
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| 174 | if derniertps[0] EQ -1 THEN $ |
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| 175 | return, report('the time axis as no date before date 2: '+strtrim(date2, 1)) |
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| 176 | derniertps = derniertps[n_elements(derniertps)-1] |
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| 177 | ENDELSE |
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| 178 | time = time[premiertps:derniertps] |
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| 179 | jpt = derniertps-premiertps+1 |
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| 180 | ENDELSE |
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| 181 | ;------------------------------------------------------------ |
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| 182 | ; nom de la grille a laquelle se rapporte le champ |
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| 183 | ;------------------------------------------------------------ |
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| 184 | vargrid = strupcase(strmid(filename, strlen(filename)-9)) |
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| 185 | if vargrid EQ 'GRID.T.NC' OR vargrid EQ 'GRID.U.NC' $ |
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| 186 | OR vargrid EQ 'GRID.V.NC' OR vargrid EQ 'GRID.F.NC' $ |
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| 187 | OR vargrid eq 'GRID.W.NC' $ |
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| 188 | OR vargrid EQ 'GRID_T.NC' OR vargrid EQ 'GRID_U.NC' $ |
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| 189 | OR vargrid EQ 'GRID_V.NC' OR vargrid EQ 'GRID_F.NC' $ |
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| 190 | OR vargrid eq 'GRID_W.NC' then $ |
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| 191 | vargrid = strupcase(strmid(filename, strlen(filename)-4, 1)) ELSE vargrid='T' |
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| 192 | ;--------------------------------------------------------------- |
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| 193 | ; redefinition du domaine |
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| 194 | ;--------------------------------------------------------------- |
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| 195 | if keyword_set(tout) then begin |
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| 196 | nx=jpi |
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| 197 | ny=jpj |
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| 198 | nz=jpk |
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| 199 | premierx = 0 |
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| 200 | premiery = 0 |
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| 201 | premierz = 0 |
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| 202 | dernierx = jpi-1 |
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| 203 | derniery = jpj-1 |
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| 204 | dernierz = jpk-1 |
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| 205 | case strupcase(vargrid) of |
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| 206 | 'T':mask = tmask |
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| 207 | 'U':mask = umask() |
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| 208 | 'V':mask = vmask() |
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| 209 | 'W':mask = tmask |
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| 210 | 'F':mask = fmask() |
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| 211 | endcase |
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| 212 | ENDIF ELSE BEGIN |
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| 213 | if keyword_set(boite) then BEGIN |
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| 214 | oldboite = [lon1, lon2, lat1, lat2, prof1, prof2] |
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| 215 | Case 1 Of |
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| 216 | N_Elements(Boite) Eq 1:bte=[lon1, lon2, lat1, lat2, 0.,boite[0]] |
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| 217 | N_Elements(Boite) Eq 2:bte=[lon1, lon2, lat1, lat2, boite[0],boite[1]] |
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| 218 | N_Elements(Boite) Eq 4:bte=[Boite, prof1, prof2] |
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| 219 | N_Elements(Boite) Eq 5:bte=[Boite[0:3], 0, Boite[4]] |
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| 220 | N_Elements(Boite) Eq 6:bte=Boite |
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| 221 | Else: return, report('Mauvaise Definition de Boite') |
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| 222 | ENDCASE |
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| 223 | domdef, bte,GRILLE=['T', vargrid], _extra = ex |
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| 224 | ENDIF |
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| 225 | grille, mask, glam, gphi, gdep, nx, ny,nz,premierx,premiery,premierz,dernierx, derniery, dernierz |
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| 226 | undefine, glam & undefine, gphi & ; on libere un peu de memoire! |
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| 227 | ENDELSE |
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| 228 | ;--------------------------------------------------------------------- |
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| 229 | ; on initialise les ixmindta, iymindta au besoin |
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| 230 | ;--------------------------------------------------------------------- |
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| 231 | if n_elements(jpidta) EQ 0 THEN jpidta = jpiglo |
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| 232 | if n_elements(jpjdta) EQ 0 THEN jpjdta = jpjglo |
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| 233 | if n_elements(jpkdta) EQ 0 THEN jpkdta = jpkglo |
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| 234 | if n_elements(ixmindta) EQ 0 THEN ixmindta = 0 |
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| 235 | if n_elements(ixmaxdta) EQ 0 then ixmaxdta = jpidta-1 |
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| 236 | if ixmindta EQ -1 THEN ixmindta = 0 |
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| 237 | IF ixmaxdta EQ -1 then ixmaxdta = jpidta-1 |
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| 238 | if n_elements(iymindta) EQ 0 THEN iymindta = 0 |
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| 239 | IF n_elements(iymaxdta) EQ 0 then iymaxdta = jpjdta-1 |
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| 240 | if iymindta EQ -1 THEN iymindta = 0 |
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| 241 | IF iymaxdta EQ -1 then iymaxdta = jpjdta-1 |
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| 242 | if n_elements(izmindta) EQ 0 THEN izmindta = 0 |
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| 243 | IF n_elements(izmaxdta) EQ 0 then izmaxdta = jpkdta-1 |
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| 244 | if izmindta EQ -1 THEN izmindta = 0 |
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| 245 | IF izmaxdta EQ -1 then izmaxdta = jpkdta-1 |
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| 246 | ;---------------------------------------------------------------- |
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| 247 | ; on va lire le fichier |
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| 248 | ;--------------------------------------------------------------- |
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| 249 | if n_elements(key_stride) LE 2 then key_stride = [1, 1, 1] |
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| 250 | key_stride = 1l > long(key_stride) |
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| 251 | jpitotal = long(ixmaxmesh-ixminmesh+1) |
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| 252 | key_shift = long(testvar(var = key_shift)) |
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| 253 | ; |
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| 254 | key = long(key_shift MOD jpitotal) |
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| 255 | if key LT 0 then key = key+jpitotal |
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| 256 | ixmin = ixminmesh-ixmindta |
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| 257 | ; |
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| 258 | @read_ncdf_varget |
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| 259 | ;--------------------------------------------------------------------- |
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| 260 | ; on definit les variables globales rattachees a la variable |
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| 261 | ;--------------------------------------------------------------------- |
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| 262 | ; varname |
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| 263 | varname = name |
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| 264 | ; varunit |
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| 265 | if varcontient.natts NE 0 then begin |
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| 266 | attnames = strarr(varcontient.natts) |
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| 267 | for attiq=0,varcontient.natts-1 do attnames[attiq]=strlowcase(ncdf_attname(cdfid,name,attiq)) |
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| 268 | ; |
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| 269 | if (where(attnames EQ 'units'))[0] EQ -1 then value = '' $ |
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| 270 | ELSE ncdf_attget,cdfid,name,'units',value |
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| 271 | varunit = strtrim(string(value), 2) |
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| 272 | ; |
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| 273 | if (where(attnames EQ 'add_offset'))[0] EQ -1 then add_offset = 0. $ |
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| 274 | ELSE ncdf_attget,cdfid,name,'add_offset',add_offset |
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| 275 | ; |
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| 276 | if (where(attnames EQ 'scale_factor'))[0] EQ -1 then scale_factor = 1. $ |
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| 277 | ELSE ncdf_attget,cdfid,name,'scale_factor',scale_factor |
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| 278 | ; |
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| 279 | if (where(attnames EQ 'missing_value'))[0] EQ -1 then missing_value = 'no' $ |
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| 280 | ELSE ncdf_attget,cdfid,name,'missing_value',missing_value |
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| 281 | ; |
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| 282 | ENDIF ELSE BEGIN |
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| 283 | varunit = '' |
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| 284 | add_offset = 0. |
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| 285 | scale_factor = 1. |
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| 286 | missing_value = 'no' |
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| 287 | ENDELSE |
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| 288 | ; vardate |
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| 289 | ; on construit une belle date lisible en fonction du langage specifie !!! |
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| 290 | nothing = juldate(debut,/vrai) ; bidouille pour recuperer year, month, day |
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| 291 | if keyword_set(language) then BEGIN |
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| 292 | if language eq 'gb' THEN $ |
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| 293 | vardate = string(format='(C(CMoA))',31*(month-1))+' '+strtrim(day, 1)+' '+strtrim(year, 1) $ |
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| 294 | ELSE vardate = strtrim(day, 1)+' '+string(format='(C(CMoA))',31*(month-1))+' '+strtrim(year, 1) |
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| 295 | ENDIF ELSE vardate = strtrim(day, 1)+' '+string(format='(C(CMoA))',31*(month-1))+' '+strtrim(year, 1) |
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| 296 | ; varexp ??? |
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| 297 | ; on applique la valeur valmask sur les points terre |
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| 298 | if NOT keyword_set(cont_nofill) then begin |
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| 299 | valmask = 1e20 |
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| 300 | case 1 of |
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| 301 | varcontient.ndims eq 2:BEGIN ;xy array |
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| 302 | mask = mask[*, *, 0] |
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| 303 | earth = where(mask EQ 0) |
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| 304 | if earth[0] NE -1 then res[earth] = 1e20 |
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| 305 | END |
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| 306 | varcontient.ndims eq 3 AND (where(varcontient.dim EQ contient.recdim))[0] EQ -1:BEGIN ;xyz array |
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| 307 | earth = where(mask EQ 0) |
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| 308 | if earth[0] NE -1 then res[earth] = 1e20 |
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| 309 | END |
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| 310 | varcontient.ndims eq 3 AND (where(varcontient.dim EQ contient.recdim))[0] NE -1:BEGIN ;xyt array |
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| 311 | mask = mask[*, *, 0] |
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| 312 | earth = where(mask EQ 0) |
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| 313 | if earth[0] NE -1 then BEGIN |
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| 314 | earth = earth#replicate(1, jpt)+replicate(nx*ny, n_elements(earth))#lindgen(jpt) |
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| 315 | res[earth] = 1e20 |
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| 316 | END |
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| 317 | END |
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| 318 | varcontient.ndims eq 4:BEGIN ;xyzt array |
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| 319 | earth = where(mask EQ 0) |
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| 320 | if earth[0] NE -1 then BEGIN |
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| 321 | earth = earth#replicate(1, jpt)+replicate(nx*ny*nz, n_elements(earth))#lindgen(jpt) |
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| 322 | res[earth] = 1e20 |
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| 323 | END |
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| 324 | END |
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| 325 | endcase |
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| 326 | endif |
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| 327 | ; on applique les add_offset, scale_factor et missing_value |
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| 328 | if size(missing_value, /type) NE 7 then BEGIN |
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| 329 | if missing_value NE valmask then begin |
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| 330 | if abs(missing_value) LT 1e6 then missing = where(res EQ missing_value) $ |
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| 331 | ELSE missing = where(abs(res) gt abs(missing_value)/10.) |
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| 332 | if missing[0] NE -1 then res[temporary(missing)] = !values.f_nan |
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| 333 | endif |
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| 334 | ENDIF |
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| 335 | if scale_factor NE 1 then res = res*scale_factor |
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| 336 | if add_offset NE 0 then res = res+add_offset |
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| 337 | ; |
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| 338 | if keyword_set(key_reverse) then res = reverse(temporary(res), 2) |
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| 339 | ;--------------------------------------------------------------------- |
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| 340 | ncdf_close,cdfid |
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| 341 | ;--------------------------------------------------------------------- |
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| 342 | if keyword_set(oldboite) then domdef, oldboite,GRILLE=['T', vargrid] |
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| 343 | if keyword_set(nostruct) then return, res $ |
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| 344 | ELSE return, {tab:res, grille:vargrid, unite:varunit, experience:varexp, nom:varname} |
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| 345 | |
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| 346 | end |
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| 347 | |
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| 348 | |
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| 349 | |
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| 350 | |
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| 351 | |
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| 352 | |
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