[2945] | 1 | ;+ |
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| 2 | PRO read_sla, Files, NumObs=NumObs, $ |
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| 3 | Latitudes=Latitudes, Longitudes=Longitudes, $ |
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| 4 | ObsSLA=ObsSLA, ModSLA=ModSLA, SLAQC=SLAQC, $ |
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| 5 | MDT=MDT, Satellites=Satellites, Types=Types, Dates=Dates, rmdi=rmdi, $ |
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| 6 | iobs=iobs, jobs=jobs, mstp=mstp, quiet=quiet, track=track |
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| 7 | ;+----------------------------------------------------------- |
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| 8 | ;IDL program to read in netcdf files of altimeter data. |
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| 9 | ; |
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[3002] | 10 | ;Author: D. J. Lea - Feb 2008 |
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| 11 | ; |
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[2945] | 12 | ;------------------------------------------------------------ |
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| 13 | rmdi = -99999. |
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| 14 | NumFiles=n_elements(Files) |
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| 15 | ;RefDate = '1950-01-01' |
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| 16 | ;!DATE_SEPARATOR='-' |
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| 17 | RefDate=JULDAY(1,1,1950,0,0) ; should be at 0 UTC |
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| 18 | |
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| 19 | ifile2=0 |
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| 20 | for ifile = 0, NumFiles-1 do begin |
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| 21 | ;------------------------------------------------------------ |
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| 22 | ;1. Open the file containing the data |
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| 23 | ncid = ncdf_open(Files(ifile), /nowrite) |
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| 24 | if ncid lt 0 and not keyword_set(quiet) then print, 'Error opening file '+Files(ifile) |
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| 25 | if ncid ge 0 then begin |
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| 26 | if not keyword_set(quiet) then print, 'Opened file '+Files(ifile)+' successfully' |
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| 27 | |
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| 28 | ;------------------------------------------------------------ |
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| 29 | ;2. Read in the dimensions in the file |
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| 30 | ncinfo = ncdf_inquire(ncid) |
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| 31 | ; var = ncdf_varinq( ncid, "SLA" ) |
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| 32 | if not keyword_set(quiet) then print,'ncinfo.ndims ',ncinfo.ndims |
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| 33 | ncdf_diminq, ncid, 0, name, NData |
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| 34 | NData2=0 |
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| 35 | cycles=1 |
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| 36 | if (ncinfo.ndims gt 2) then ncdf_diminq, ncid, 2, name, NData2 |
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| 37 | if (ncinfo.ndims gt 1) then ncdf_diminq, ncid, 1, name, cycles |
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| 38 | |
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| 39 | |
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| 40 | if not keyword_set(quiet) then print,NData, NData2 |
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| 41 | |
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| 42 | NData=max([NData*cycles, NData2*cycles]) |
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| 43 | |
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| 44 | ; print,NData, NData2 |
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| 45 | |
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| 46 | if (NData gt 0) then begin |
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| 47 | ;------------------------------------------------------------ |
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| 48 | ;3. Allocate the data arrays and read in the data |
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| 49 | lons = dblarr(NData) |
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| 50 | lats = dblarr(NData) |
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| 51 | obsval = fltarr(NData) |
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| 52 | modval = fltarr(NData) |
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| 53 | mdtval = fltarr(NData) |
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| 54 | bytQC = bytarr(NData) |
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| 55 | QC = fltarr(NData) |
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| 56 | Dats = dblarr(NData) |
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| 57 | trackval = intarr(NData) |
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| 58 | Sats = intarr(NData) |
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| 59 | strSats= strarr(NData) |
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| 60 | StrVal = strarr(8) |
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| 61 | ; dts = replicate(!dt_base, NData) |
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| 62 | dts = dblarr(NData) |
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| 63 | |
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| 64 | ; info,lons |
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| 65 | varid = ncdf_varid(ncid, 'LONGITUDE') |
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| 66 | scale_factor=1. |
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| 67 | if (varid eq -1) then begin |
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| 68 | varid = ncdf_varid(ncid, 'Longitudes') |
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[3069] | 69 | if (varid eq -1) then begin |
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| 70 | varid = ncdf_varid(ncid, 'longitude') |
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| 71 | endif |
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[2945] | 72 | ncdf_attget, ncid, varid, 'scale_factor', scale_factor |
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| 73 | endif |
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| 74 | ncdf_varget, ncid, varid, lons |
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| 75 | lons=lons*scale_factor |
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| 76 | ; info, lons |
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| 77 | if (cycles gt 1) then begin |
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| 78 | lonsn=lons |
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| 79 | for i=1,cycles-1 do begin |
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| 80 | lonsn=[lonsn,lons] |
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| 81 | endfor |
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| 82 | lons=lonsn |
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| 83 | endif |
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| 84 | |
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| 85 | ; info, lons |
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| 86 | |
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| 87 | ; info,lats |
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| 88 | varid = ncdf_varid(ncid, 'LATITUDE') |
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| 89 | scale_factor=1. |
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| 90 | if (varid eq -1) then begin |
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| 91 | varid = ncdf_varid(ncid, 'Latitudes') |
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[3069] | 92 | if (varid eq -1) then begin |
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| 93 | varid = ncdf_varid(ncid, 'latitude') |
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| 94 | endif |
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[2945] | 95 | ncdf_attget, ncid, varid, 'scale_factor', scale_factor |
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| 96 | endif |
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| 97 | ncdf_varget, ncid, varid, lats |
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| 98 | lats=lats*scale_factor |
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| 99 | ; info, lats |
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| 100 | if (cycles gt 1) then begin |
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| 101 | latsn=lats |
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| 102 | for i=1,cycles-1 do begin |
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| 103 | latsn=[latsn,lats] |
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| 104 | endfor |
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| 105 | lats=latsn |
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| 106 | endif |
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| 107 | |
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| 108 | ; info, lats |
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| 109 | |
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| 110 | varid = ncdf_varid(ncid, 'JULD') |
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[3069] | 111 | if (varid eq -1) then begin |
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| 112 | varid = ncdf_varid(ncid, 'time') |
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| 113 | endif |
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[2945] | 114 | if (varid ne -1) then begin |
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| 115 | ncdf_varget, ncid, varid, Dats |
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| 116 | endif else begin |
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| 117 | varid = ncdf_varid(ncid, 'BeginDates') |
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| 118 | ncdf_varget, ncid, varid, Bds |
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| 119 | ; print,bds |
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| 120 | ; info, bds |
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| 121 | if (cycles gt 1) then begin |
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| 122 | bds=transpose(bds) |
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| 123 | endif |
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| 124 | varid = ncdf_varid(ncid, 'NbPoints') |
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| 125 | ncdf_varget, ncid, varid, nbpoints |
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| 126 | |
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| 127 | ; Read in dataindexes and deltat in cls format file |
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| 128 | ; These are used to adjust dates |
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| 129 | varid = ncdf_varid(ncid, 'DeltaT') |
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| 130 | if (varid ne -1) then begin |
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| 131 | ncdf_varget, ncid, varid, deltat |
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| 132 | ncdf_attget, ncid, varid, 'scale_factor', scale_factor |
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| 133 | deltat=deltat*scale_factor |
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| 134 | varid = ncdf_varid(ncid, 'DataIndexes') |
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| 135 | ncdf_varget, ncid, varid, dataindexes |
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| 136 | |
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| 137 | endif |
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| 138 | |
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| 139 | print, 'deltat ',deltat |
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| 140 | ; print, 'dataindexes ',dataindexes |
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| 141 | |
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| 142 | ; info, nbpoints |
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| 143 | ; print,nbpoints |
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| 144 | ; info, cycles |
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| 145 | cumbds=[0] |
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| 146 | nbpointst=nbpoints |
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| 147 | dataindexest=dataindexes |
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| 148 | for i=1,cycles-1 do begin |
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| 149 | nbpointst=[nbpointst,nbpoints] |
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| 150 | dataindexest=[dataindexest,dataindexes] |
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| 151 | endfor |
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| 152 | cumbds=[0,total(nbpointst,/cumulative)] |
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| 153 | ; if not keyword_set(quiet) then print,'cumbds ',cumbds |
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| 154 | nel=n_elements(Bds) |
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| 155 | ; info,nel |
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| 156 | ; if not keyword_set(quiet) then print,n_elements(dats) |
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| 157 | for i=0,nel-1 do begin |
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| 158 | ; print,'*',i, cumbds(i+1)-cumbds(i) |
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| 159 | ; print,i,cumbds(i),cumbds(i+1)-1 |
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| 160 | dats(cumbds(i):cumbds(i+1)-1)=bds(i) |
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| 161 | trackval(cumbds(i):cumbds(i+1)-1)=i |
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| 162 | dataindexest(cumbds(i):cumbds(i+1)-1)=dataindexest(cumbds(i):cumbds(i+1)-1)-dataindexest(cumbds(i)) |
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| 163 | endfor |
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| 164 | |
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| 165 | ; adjust dats based on dataindex |
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| 166 | dats=dats+dataindexest*deltat/86400. |
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| 167 | |
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| 168 | |
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| 169 | ; print, dats |
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| 170 | endelse |
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| 171 | |
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| 172 | |
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| 173 | |
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| 174 | dts=RefDate + Dats |
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| 175 | |
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| 176 | varid = ncdf_varid(ncid, 'MISSION') |
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| 177 | if (varid ne -1) then begin |
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| 178 | ncdf_varget, ncid, varid, Sats |
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| 179 | ncdf_attget, ncid, varid, 'Value_0', StrVal0 |
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| 180 | ncdf_attget, ncid, varid, 'Value_1', StrVal1 |
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| 181 | ncdf_attget, ncid, varid, 'Value_2', StrVal2 |
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| 182 | ncdf_attget, ncid, varid, 'Value_3', StrVal3 |
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| 183 | ncdf_attget, ncid, varid, 'Value_4', StrVal4 |
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| 184 | ncdf_attget, ncid, varid, 'Value_5', StrVal5 |
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| 185 | ncdf_attget, ncid, varid, 'Value_6', StrVal6 |
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| 186 | ncdf_attget, ncid, varid, 'Value_7', StrVal7 |
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| 187 | StrVal=[StrVal0, StrVal1, StrVal2, StrVal3, StrVal4, $ |
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| 188 | StrVal5, StrVal6, StrVal7] |
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| 189 | for ival = 0, 7 do begin |
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| 190 | pts = where(Sats eq ival, count) |
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| 191 | if count gt 0 then strSats(pts) = StrVal(ival) |
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| 192 | endfor |
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| 193 | endif |
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| 194 | |
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| 195 | varid = ncdf_varid(ncid, 'SLA') |
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| 196 | ncdf_varget, ncid, varid, obsval |
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| 197 | ncdf_attget, ncid, varid, '_FillValue', FillValue |
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| 198 | scale_factor=1. |
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[3069] | 199 | add_offset=0. |
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| 200 | ;if (ncinfo.ndims gt 2) then ncdf_attget, ncid, varid, 'scale_factor', scale_factor |
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| 201 | ncviq=ncdf_varinq(ncid, varid) |
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| 202 | for iatt=0,ncviq.natts-1 do begin |
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| 203 | ncaiq=ncdf_attname(ncid, varid, iatt) |
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| 204 | if ( ncaiq eq 'scale_factor') then ncdf_attget, ncid, varid, 'scale_factor', scale_factor |
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| 205 | if ( ncaiq eq 'add_factor') then ncdf_attget, ncid, varid, 'add_factor', add_factor |
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| 206 | endfor |
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| 207 | |
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[2945] | 208 | if not keyword_set(quiet) then print,'SLA scale factor: ',scale_factor |
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[3069] | 209 | if not keyword_set(quiet) then print,'SLA add offset: ',add_offset |
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[2945] | 210 | if not keyword_set(quiet) then print,'SLA FillValue: ',FillValue |
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| 211 | pts = where(obsval eq FillValue, count) |
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| 212 | ; if not keyword_set(quiet) then print,count |
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[3069] | 213 | obsval=obsval*scale_factor+add_offset |
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[2945] | 214 | if count gt 0 then obsval(pts) = rmdi |
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| 215 | |
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| 216 | varid = ncdf_varid(ncid, 'SLA_Hx') |
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| 217 | if (varid ne -1) then begin |
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| 218 | ncdf_varget, ncid, varid, modval |
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| 219 | ncdf_attget, ncid, varid, '_FillValue', FillValue |
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| 220 | ; if not keyword_set(quiet) then print,'SLA_Hx FillValue ',FillValue |
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| 221 | pts = where(modval eq FillValue or modval eq -9999.0, count) |
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| 222 | ; if not keyword_set(quiet) then print,count |
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| 223 | if count gt 0 then modval(pts) = rmdi |
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| 224 | endif |
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| 225 | |
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| 226 | varid = ncdf_varid(ncid, 'SLA_QC') |
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| 227 | if (varid ne -1) then begin |
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| 228 | ncdf_varget, ncid, varid, bytQC |
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| 229 | ncdf_attget, ncid, varid, '_FillValue', FillValue |
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| 230 | QC(*) = 0. |
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| 231 | pts = where(bytQC eq FillValue, count) |
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| 232 | if count gt 0 then QC(pts) = rmdi |
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| 233 | pts = where(bytQC ne 48, count) |
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| 234 | if count gt 0 then QC(pts) = 1. |
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| 235 | endif |
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| 236 | |
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| 237 | varid = ncdf_varid(ncid, 'MDT') |
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| 238 | if (varid ne -1) then ncdf_varget, ncid, varid, mdtval |
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| 239 | |
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| 240 | varid = ncdf_varid(ncid, 'data_source') |
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| 241 | if varid ne -1 then begin |
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| 242 | ncdf_varget, ncid, varid, obstyp |
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| 243 | endif else begin |
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| 244 | varid = ncdf_varid(ncid, 'MISSION') |
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| 245 | if varid ne -1 then ncdf_varget, ncid, varid, obstyp |
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| 246 | endelse |
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| 247 | |
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| 248 | ; reads in multi cycle data the wrong way round! |
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| 249 | if (cycles gt 1) then begin |
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| 250 | obsval=reform(obsval,[cycles,ndata/cycles]) |
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| 251 | obsval=transpose(obsval) |
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| 252 | modval=reform(modval,[cycles,ndata/cycles]) |
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| 253 | modval=transpose(modval) |
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| 254 | QC=reform(QC,[cycles,ndata/cycles]) |
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| 255 | QC=transpose(QC) |
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| 256 | endif |
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| 257 | |
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| 258 | varid = ncdf_varid(ncid, 'IOBS') |
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| 259 | if (varid ne -1) then ncdf_varget, ncid, varid, iobsval |
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| 260 | |
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| 261 | varid = ncdf_varid(ncid, 'JOBS') |
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| 262 | if (varid ne -1) then ncdf_varget, ncid, varid, jobsval |
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| 263 | |
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| 264 | varid = ncdf_varid(ncid, 'MSTP') |
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| 265 | if (varid ne -1) then ncdf_varget, ncid, varid, mstpval |
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| 266 | |
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| 267 | ; info, obssla |
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| 268 | ; info, obsval |
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| 269 | ; info, modsla |
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| 270 | ; info, modval |
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| 271 | |
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| 272 | if ifile2 eq 0 then begin |
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| 273 | Latitudes = [float(lats)] |
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| 274 | Longitudes = [float(lons)] |
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| 275 | ObsSLA = [obsval(*)] |
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| 276 | ModSLA = [modval(*)] |
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| 277 | MDT = [mdtval] |
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| 278 | SLAQC = [QC] |
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| 279 | Dates = [dts] |
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| 280 | Satellites = [strSats] |
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| 281 | if (n_elements(obstyp) gt 0) then Types = [obstyp] |
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| 282 | if (n_elements(iobsval) gt 0) then iobs = [iobsval] |
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| 283 | if (n_elements(jobsval) gt 0) then jobs = [jobsval] |
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| 284 | if (n_elements(mstpval) gt 0) then mstp = [mstpval] |
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| 285 | if (n_elements(trackval) gt 0) then track = [trackval] |
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| 286 | endif else begin |
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| 287 | Latitudes = [Latitudes, float(lats)] |
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| 288 | Longitudes = [Longitudes, float(lons)] |
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| 289 | ObsSLA = [ObsSLA, obsval(*)] |
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| 290 | ModSLA = [ModSLA, modval(*)] |
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| 291 | MDT = [MDT, mdtval] |
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| 292 | SLAQC = [SLAQC, QC] |
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| 293 | Dates = [Dates, dts] |
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| 294 | Satellites = [Satellites, strSats] |
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| 295 | if (n_elements(obstyp) gt 0) then Types = [Types, obstyp] |
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| 296 | if (n_elements(iobsval) gt 0) then iobs = [iobs, iobsval] |
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| 297 | if (n_elements(jobsval) gt 0) then jobs = [jobs, jobsval] |
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| 298 | if (n_elements(mstpval) gt 0) then mstp = [mstp, mstpval] |
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| 299 | if (n_elements(trackval) gt 0) then tracks = [track, trackval] |
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| 300 | endelse |
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| 301 | |
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| 302 | ifile2=ifile2+1 |
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| 303 | endif |
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| 304 | ncdf_close, ncid |
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| 305 | |
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| 306 | endif |
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| 307 | |
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| 308 | endfor ; ifile |
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| 309 | |
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| 310 | NumObs = n_elements(Latitudes) |
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| 311 | |
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| 312 | END |
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