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Pixel day/night determination within SST L2

https://forum.earthdata.nasa.gov/viewtopic.php?t=1715

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Pixel day/night determination within SST L2

Posted: Wed Jul 03, 2019 3:27 pm America/New_York
by alaroy
If I have an L2 SST granule with the day_night_flag set to "Mixed", is there a method to determine which pixels within the granule are day vs night vs dusk?

Is the answer any different for VIIRS NPP vs VIIRS N20 vs MODISA?

-Andrew L.

Pixel day/night determination within SST L2

Posted: Fri Jul 05, 2019 11:49 am America/New_York
by OB.DAAC - SeanBailey
HISOLZEN flag.

For SST processing we set the maxsunzen option to 90 degrees.  Any pixel with a solz greater than 90 degrees gets flagged as HISOLZEN.  We use this flag (or it's complement, if nighttime) when binning SST.

The sun elevation doesn't care which sensor is viewing it, so, not there are no differences for this day/night discrimination between sensors :wink:

Sean
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