Landsat 8 GSM and GIOP chl difference

Use this Forum to find information on, or ask a question about, NASA Earth Science data.
Post Reply
junzhao
Posts: 28
Joined: Fri Oct 07, 2011 11:21 am America/New_York
Answers: 0

Landsat 8 GSM and GIOP chl difference

by junzhao » Mon May 29, 2017 9:32 am America/New_York

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?
Thanks.
Jun

Tags:

OB.DAAC - SeanBailey
User Services
User Services
Posts: 1470
Joined: Wed Sep 18, 2019 6:15 pm America/New_York
Answers: 1
Been thanked: 5 times

Landsat 8 GSM and GIOP chl difference

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

Jun,

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.

Sean

Post Reply