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MODIS-Aqua POC data June 2014 onwards
Posted: Tue Aug 22, 2017 4:01 pm America/New_York
by peter.strutton
There seems to be a problem with the monthly 9km POC data after May 2014, has anyone else noticed this? File sizes become much smaller and seem corrupted?
https://oceandata.sci.gsfc.nasa.gov/MODIS-Aqua/Mapped/Monthly/9km/poc/
MODIS-Aqua POC data June 2014 onwards
Posted: Wed Aug 23, 2017 9:59 am America/New_York
by OB SeaDAS - dshea
The SMI files after May 2014 are produced by l3mapgen instead of smigen. The new files are smaller since the poc data is stored as a scaled 16 bit int instead of a 32 bit float. As you noticed, the file size is almost 3 times smaller. From the NetCDF metadata:
short poc(lat, lon) ;
poc:scale_factor = 0.2f ;
poc:add_offset = 6400.f ;
poc:_FillValue = -32767s ;
so:
pocVal(float) = poc(short) * scale_factor + add_offset
The files look fine. Can you point me to a file that seems corrupt?
don