Sea Ice flag criteria

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smcclish
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Sea Ice flag criteria

by smcclish » Tue May 24, 2022 8:32 pm America/New_York

Hi,
I am wondering what is the criteria for the l2 flags CLDICE and SEAICE and what is the difference? Basically I'm trying to understand how level 2 and level 3 chlorophyll data is masked for sea ice.

Thanks!

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ASDC - ingridgs
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Re: Sea Ice flag criteria

by ASDC - ingridgs » Wed May 25, 2022 8:07 am America/New_York

Hello,

In order to better re-direct your question, can you please let us know what product and what platform are you using to retrieve the product?
Thank you

OB.DAAC - SeanBailey
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Re: Sea Ice flag criteria

by OB.DAAC - SeanBailey » Wed May 25, 2022 9:15 am America/New_York

The l2gen flag CLDICE is set for a pixel when the cloud albedo (defined as the rayleigh corrected TOA refectance in a specified NIR or SWIR band - varies by sensor) is above a threshold (default is 0.027 for the band closest to 865nm). It's the cloud/ice flag because both clouds and ice can trigger it.
The SEAICE flag set by the input "icefile" dataset and is set when the ice fraction exceeds 10%.

Sean

smcclish
Posts: 2
Joined: Tue May 24, 2022 8:27 pm America/New_York

Re: Sea Ice flag criteria

by smcclish » Wed May 25, 2022 4:14 pm America/New_York

Great! Thank you so much for your help.

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