===== README for GLI Global Mapped Radiance data files =====

by JAXA GLI Calibration-4th Group

GOTO RADIANCE DATA DIRECTORY (FTP) 
goto RGB browse directory 
sample all-channel images
goto PI's Door (ancillary)

These binary (big-endian ieee) files are made for evaluating GLI radiance globally. 
They are also useful for testing or developing Level-2 algorithms.

---Global radiance file name
A2GL1YYMMDD_gmXX00_PW1B.pixel_line
  YY: year, MM: month, DD: day
  XX al: all day-mode, ds: descending data, as: ascending data
  W V: VNIR, S: SWIR, M: MTIR
  pixel: 2880 (centered from 0 to 359.875E),
  line: 1441 (from 90N to 90S)

 ---Global radiance file format
 - structure
  header(2byte*pixel)
  +uint16*pixel*line*ch(VNIR:ch 1-19, SWIR:ch 1-6, MTIR:ch 1-7 [W/m^2/str/um]=DN*slope(nb))
  +int16*pixel*line*4(SAZ,SAA,SOZ,SOA[degree]=DN*0.01)
  +int16*pixel*line*1(UTC[hr]=DN*0.001)
  +int16*pixel*line*1(land_water_flag[land:1, water:0])
  +int16*pixel*line*1(ancillary-1: scan mirror angle[deg]=DN*0.01)
  +int16*pixel*line*1(ancillary-2: deep-space DN of ch18 or ch24, or black body obs DN)
  +int16*pixel*line*1(ancillary-3: sunlight-monitor DN, or black body temp*100)

   Err/no-data value: DN=65535 or 65534 (radiance)
                                  DN=-32768 (angles and time)

  - "header" format
   VNIR:
         read(head,'(2i6,2f8.2,f8.4,i3,25e12.5,a1,a8,a1,a40)')
     &            nl,ml,upperleftlon,upperleftlat,resolution,
     &            nbl,(slope(k),k=1,nbl),',','L1B_VTIR',',',outfile(1:40)
   SWIR:
         read(head,'(2i6,2f8.2,f8.4,i3,12e12.5,a1,a8,a1,a40)')
     &            nl,ml,upperleftlon,upperleftlat,resolution,
     &            nbl,(slope(k),k=1,nbl;),',','L1B_STIR',',',outfile(1:40)
   MTIR:
         read(head,'(2i6,2f8.2,f8.4,i3,13e12.5,a1,a8,a1,a40)')
     &            nl,ml,upperleftlon,upperleftlat,resolution,
     &            nbl,(slope(k),k=1,nbl),',','L1B_MTIR',',',outfile(1:40)
  nl: pixel, ml: line, 
  upperleftlon: start longitude, upperleftlat: start latitude, 
  resolution: spatial resolution
  nbl: number of parameters (radiance+angles+time; 25: VNIR, 12: SWIR, 13: MTIR)

 ---Sample to read the global radiance data
c     ------------------ Sample -------------------
      character  header*400
      integer*2  data(2880,2000)
      integer    pixel,line
      real       upperleftlon,upperleftlat,resolution
c
c     ncl=19, nb=1:19 when GLI CH=1-19 (VNIR)
c     ncl=6,  nb=1:6 when GLI CH=24-29 (SWIR)
c     ncl=7,  nb=1:7 when GLI CH=30-36 (MTIR)
c
      filename=A2GL1YYMMDD_gmal00_PV1B.2880_1441
      ncl=19
      nbl=ncl+6
c
c     ------------------------------
      nb=10    ! for example, read ch10
c     ------------------------------
c
      open(10,file='filename',status='old',
     & form='unformatted',access='direct',recl=pixel*2)

      read(10,rec=1) header
c
      read(header,'(2i6,2f8.2,f8.4,i3,25e12.5)')
     &    pixel,line,upperleftlon,upperleftlat,resolution,
     &    nbl,(slope(nb),nb=1,nbl)
c
      do m=1,line
       read(10,rec=1+(nb-1)*line+m) (data(n,m),n=1,pixel)
       do n=1,pixel
        if(data(n,m).gt.0) then
         rad=data(n,m)*slope(nbg)
         write(6,'(a17,f9.4,3(a2,i4),a1)')
     &     'Lt[W/m^2/str/um]=',rad,' (',n,', ',m,', ',nb,')'
        elseif(data(n,m).lt.-2) then
         rad=(data(n,m)+65536)*slope(nbg)
         write(6,'(a17,f9.4,3(a2,i4),a1)')
     &     'Lt[W/m^2/str/um]=',rad,' (',n,', ',m,', ',nb,')'
        else
         write(6,'(a9,3(a2,i4),a1)')
     &     'Data lack',' (',n,', ',m,', ',nb,')'
        endif
       enddo
      enddo
      close(10)
c
      stop
      end
c     ------------------------------------------------------

References
under preparation
We recommend applying the correction factors (vicarious calibration coefficients) for your algorithm input.

Notice
When you use the "GLI global mapped radiance" data in publications, please refer "The tems of Use of Research Data" and include the following credits:

"GLI global mapped radiance was produced and supplied by the Earth Observation Research Center, Japan Aerospace Exploration Agency."

Also, we would appreciate receiving a preprint and/or reprint of those publications utilizing the data for inclusion in the ADEOS-II/GLI bibliography. These publications should be sent to: 

The EORC GLI Office
Earth Observation Research Center (EORC)
Japan Aerospace Exploration Agency (JAXA) 
2-1-1, Sengen, Tsukuba, Ibaraki 305-8505, Japan
E-mail:

Please contact us for any comments, problems or questions at e-mail address: