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Landsat 8 GSM and GIOP chl difference

Posted: Mon May 29, 2017 9:32 am America/New_York
by junzhao
Hi there,
I processed one Landsat 8 scene and generated chlorophyll maps using GSM and GIOP algorithms. But there are big differences in terms of valid pixels. Please see the attached maps. From my understanding, it is reasonable for the difference in values of chlorophyll from the two algorithms. But by implementing the same flags, valid pixels from the two maps should be the same.
Did I miss anything?

Landsat 8 GSM and GIOP chl difference

Posted: Wed May 31, 2017 8:12 am America/New_York
by OB.DAAC - SeanBailey

Both GSM and GIOP are semi-analytical models employing non-linear inversion.  You should not expect that both will result in the same valid retrieval count.   One may retrieve a result where the other fails to converge.