Wrong SeaWiFS PAR on MLAC swath borders
Posted: Thu Sep 28, 2023 9:12 am America/New_York
Hi,
We found that the default SeaDAS l2bin flags filtering for SeaWiFS GAC&MLAC PAR:
flaguse=LAND,NAVFAIL,FILTER,HIGLINT (in the file l2bin_defaults_PAR.par)
seems not enough for MLAC products because there is a vertical band with very low PAR values on MLAC swath border.
It seems the HISATZEN can remove these wrong PAR pixels.
GAC are not impacted maybe because the swath is thinner. I don't know if other sensors have a similar PAR issue.
Example: SEASTAR_SEAWIFS_MLAC.19990620T160022.L2.OC.nc, see MLAC PAR vs GAC on attached screenshot, with the suspect vertical band in purple.
Have a nice day,
Julien
We found that the default SeaDAS l2bin flags filtering for SeaWiFS GAC&MLAC PAR:
flaguse=LAND,NAVFAIL,FILTER,HIGLINT (in the file l2bin_defaults_PAR.par)
seems not enough for MLAC products because there is a vertical band with very low PAR values on MLAC swath border.
It seems the HISATZEN can remove these wrong PAR pixels.
GAC are not impacted maybe because the swath is thinner. I don't know if other sensors have a similar PAR issue.
Example: SEASTAR_SEAWIFS_MLAC.19990620T160022.L2.OC.nc, see MLAC PAR vs GAC on attached screenshot, with the suspect vertical band in purple.
Have a nice day,
Julien