| 1 | pro get_atm_temp,level1b_file,tempfile,emissivity=emissivity,brightness=brightness |
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| 2 | |
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| 3 | ; Converts ATM radiances to temperature and outputs it in a copy of the ATM |
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| 4 | ; level 1B file with band 11 replaced by scaled temperature. |
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| 5 | ; Also replaces band 1 (useless anyway!) with a sinusoidal weighting function |
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| 6 | ; from zero at the two ends to 65535 in the middle of the scan. |
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| 7 | ; If emissivity is not set, a value of 0.98 typical of water is used. |
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| 8 | ; If brightness is set, the emissivity is set to 1 so brightness temperature is |
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| 9 | ; output. |
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| 10 | |
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| 11 | scale=100. |
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| 12 | lambda=8000.+findgen(141)*50. |
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| 13 | response=[.355,.601,1.516,3.861,9.228,18.909,32.217,49.088,66.147,74.362, $ |
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| 14 | 73.921,74.65,79.395,85.655,89.796,89.961,86.917,83.729,81.554,81.689,82.382, $ |
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| 15 | 83.753,85.398,87.673,90.818,93.771,97.239,99.093,99.788,99.303,97.256, $ |
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| 16 | 94.367,91.656,89.055,89.012,89.984,91.436,93.076,96.083,97.547,97.839, $ |
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| 17 | 96.276,95.595,93.101,90.414,89.376,88.846,88.937,89.45,89.09,88.989,89.273, $ |
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| 18 | 89.493,91.365,91.361,90.564,93.651,96.481,94.359,89.362,83.905,79.661, $ |
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| 19 | 77.323,73.96,71.288,68.293,63.318,59.337,56.775,54.588,52.397,50.389,48.655, $ |
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| 20 | 46.431,44.638,42.024,41.344,39.604,39.065,38.557,38.788,38.903,39.965, $ |
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| 21 | 40.435,41.115,41.589,40.722,40.448,39.724,39.7,40.509,39.513,39.043,38.721, $ |
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| 22 | 38.377,37.527,36.191,35.059,35.889,32.06,30.039,27.925,25.09,23.672,20.754, $ |
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| 23 | 18.254,16.791,15.736,12.703,10.61,8.807,8.775,7.364,6.668,6.233,4.96,3.874, $ |
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| 24 | 3.444,3.832,4.096,3.517,3.584,1.962,2.043,2.2,2.027,2.063,1.373,2.123,1.357, $ |
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| 25 | 1.182,1.296,.652,1.234,.645,.676,.695,.687,.577,.686,.757] |
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| 26 | if n_elements(emissivity) gt 0 then eps=emissivity[0] else $ |
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| 27 | if keyword_set(brightness) then eps=1. else $ |
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| 28 | eps=.98 ; water emissivity, could make it angle dependent |
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| 29 | if ~hdf_ishdf(level1b_file) then begin |
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| 30 | ; let's try an ENVI BIP - look for the header |
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| 31 | if ~file_test(level1b_file+'.hdr') then $ |
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| 32 | message,'Unidentified level 1B file - not HDF or BIP' |
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| 33 | openr,unit,level1b_file+'.hdr',/get |
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| 34 | str='' |
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| 35 | repeat readf,unit,str until strcmp(strmid(str,0,7),'samples',/fold) |
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| 36 | ns=long(strmid(str,strpos(str,'=')+1)) |
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| 37 | repeat readf,unit,str until strcmp(strmid(str,0,5),'lines',/fold) |
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| 38 | nl=long(strmid(str,strpos(str,'=')+1)) |
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| 39 | repeat readf,unit,str until strcmp(strmid(str,0,5),'bands',/fold) |
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| 40 | nb=long(strmid(str,strpos(str,'=')+1)) |
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| 41 | if ~max(nb eq [1,11]) then message,'Need 1 or 11 bands in ENVI file' |
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| 42 | repeat readf,unit,str until strcmp(strmid(str,0,10),'interleave',/fold) |
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| 43 | format=strlowcase(strtrim(strmid(str,strpos(str,'=')+1),2)) |
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| 44 | if format ne 'bip' then $ |
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| 45 | message,'Level 1B file format '+format+' not currently supported' |
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| 46 | bip=1 |
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| 47 | close,unit |
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| 48 | openr,unit,level1b_file |
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| 49 | if nb eq 11 then indata=uintarr(11,ns) else dn=uintarr(ns) |
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| 50 | if ~file_test(tempfile) then begin |
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| 51 | temp_sdid=hdf_sd_start(tempfile,/create) |
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| 52 | temp_sdsid=hdf_sd_create(temp_sdid,'ATdata',[ns,nl,11],/dfnt_uint16) |
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| 53 | hdf_sd_endaccess,temp_sdsid |
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| 54 | hdf_sd_end,temp_sdid |
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| 55 | endif |
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| 56 | endif else begin |
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| 57 | bip=0 |
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| 58 | if ~file_test(tempfile) then file_copy,level1b_file,tempfile |
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| 59 | level1b_fid=hdf_open(level1b_file) |
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| 60 | level1b_sdid=hdf_sd_start(level1b_file) |
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| 61 | index=hdf_sd_nametoindex(level1b_sdid,'ATdata') |
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| 62 | level1b_sdsid=hdf_sd_select(level1b_sdid,index) |
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| 63 | hdf_sd_getinfo,level1b_sdsid,dims=dims |
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| 64 | ns=dims[0] |
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| 65 | nl=dims[1] |
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| 66 | endelse |
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| 67 | file_chmod,tempfile,/u_write |
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| 68 | weights=uint(sin(dindgen(ns)*!dpi/(ns-1))*65535d0+.5d0) |
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| 69 | temp_sdid=hdf_sd_start(tempfile,/rdwr) |
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| 70 | index=hdf_sd_nametoindex(temp_sdid,'ATdata') |
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| 71 | temp_sdsid=hdf_sd_select(temp_sdid,index) |
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| 72 | for line=0,nl-1 do begin |
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| 73 | if bip then begin |
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| 74 | if nb eq 11 then begin |
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| 75 | readu,unit,indata |
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| 76 | dn=reform(indata[10,*]) |
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| 77 | endif else readu,unit,dn |
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| 78 | endif else hdf_sd_getdata,level1b_sdsid,dn,start=[0,line,10],count=[ns,1,1] |
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| 79 | radiance=dn*.001 |
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| 80 | temp=t_bb(radiance,lambda,response,emissivity=eps,/trunc,t_bb_data=t_bb_data) |
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| 81 | dn[*]=temp*scale>0<65535 |
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| 82 | hdf_sd_adddata,temp_sdsid,dn,start=[0,line,10],count=[ns,1,1] |
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| 83 | hdf_sd_adddata,temp_sdsid,weights,start=[0,line,0],count=[ns,1,1] |
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| 84 | check=check_math() |
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| 85 | if (check and not 32) ne 0 then stop |
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| 86 | endfor |
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| 87 | hdf_sd_endaccess,temp_sdsid |
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| 88 | hdf_sd_end,temp_sdid |
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| 89 | if bip then free_lun,unit else begin |
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| 90 | hdf_sd_endaccess,level1b_sdsid |
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| 91 | hdf_sd_end,level1b_sdid |
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| 92 | hdf_close,level1b_fid |
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| 93 | endelse |
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| 94 | |
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| 95 | end |
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| 96 | |
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