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

by JAXA EORC GAIT Ocean

GOTO Data files (FTP site)

These binary (big-endian ieee) files are made for evaluating GLI ocean product globally. 
They are not the standard products, but generally similar.

---Global ocean data file name
Ver.0
L2GMMDD_Avmad_"param"T3
  MM: average month, DD: start day
  param (chla, dpar, sst2): chlorophyll-a concentration, daily PAR, sea surface temperature

Ver.2.2
A2GL1YYMMDD_gmal00_OCSFR_01440_00720_chla
A2GL1YYMMDD_gmal00_ONLFR_01440_00720_par_amsr
A2GL1YYMMDD_gmds00_OSTFR_01440_00720_sst
  MM: average month, DD: start day
  chla: mohtly averaged chlorophyll-a concentration
  par_amsr: monthly averaged daily PAR reduced by ice-free area detected by AMSR ice cover
  sst: mohtly averaged sea surface temperature (using decending path)

---Global ocean data file format
 - structure
Ver.0
  uint16*pixel*line
  pixel: 2880 (centered from 0 to 359.875E),
  line: 1441 (from 90N to 90S)

 Err/no-data value: DN=0

Ver.2.2
 ascii header (2byte*pixel) +uint16*pixel*line
  pixel: 1440 (centered from 0 to 359.75E),
  line: 720 (from 90N to 89.75S)
 header fromat:
      read(head,'(2i6,2f8.2,f8.3,2f9.4,1x,a8,1x,a55)')
     &     nl,ml,ullon,ullat, resl,slope,offset,param,outfile
value=data*slope+offset
  chla: slope=0.0015, offset=0., unit: mg/m^3
  par_amsr: slope=0.002, offset=0., unit: Ein/m^2/day
  sst: slope=0.01, offset=263.15, unit: K

 ---Sample to read the global radiance data (Ver.0)
c     ------------------ Sample -------------------
      integer*2  data(2880,1441)
      integer    pixel,line
      real       param, slope,offset
c
      filename='L2GMMDD_Avmad_chlaT3'
      slope=0.0015  ! 0.0015 (mg/m^3) if chla, 0.01 if sst (K) or dpar (Ein/m^2/day)
      offset=0.          ! 0 if chla or dpar. 263.15 if sst.
      pixel=2880
      line=1441
c
      open(10,file=filename,status='old',
     & form='unformatted',access='direct',recl=pixel*2)
c
      do m=1,line
       read(10,rec=m) (data(n,m),n=1,pixel)
       do n=1,pixel
        if(data(n,m).gt.0) then
         param=data(n,m)*slope+offset
         write(6,'(a6,f9.4,3(a2,i4),a1)')
     &     'Param=',param,' (',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
GLI global mapped radiance data page
GLI ocean ATBD 
Validation using global data

Notice
When you use the "GLI global mapped radiance" data in publications, please include the following credits:

"GLI global mapped ocean data was produced and supplied by the Earth Observation Research and application 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-2/GLI bibliography. These publications should be sent to: 

The EORC GLI Office
Earth Observation Research and application Center
Japan Aerospace Exploration Agency
23rd Floor Office Tower X, Harumi Triton Square,
1-8-10, Harumi, Chuo-ku, Tokyo 104-6023, JAPAN
E-mail:

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