Deriving chlorophyll from MODIS AQUA L1 data is Advisable

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suthagar
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Deriving chlorophyll from MODIS AQUA L1 data is Advisable

by suthagar » Thu Dec 09, 2021 12:34 am America/New_York

Hello,

I want to derive chlorophyll data from L1 data from MODIS AQUA it is possible?
If okay, Kindly suggest procedure.

Thank you

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OB SeaDAS - xuanyang02
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Re: Deriving chlorophyll from MODIS AQUA L1 data is Advisable

by OB SeaDAS - xuanyang02 » Thu Dec 09, 2021 11:04 am America/New_York

Chlor_a is available in L2 data - https://oceandata.sci.gsfc.nasa.gov/dir ... S-Aqua/L2/

You can also use SeaDAS to process MODIS AQUA L1A data to L2:
modis_GEO: L1A -> geo https://seadas.gsfc.nasa.gov/help-8.1.0 ... s_GEO.html
ModiS_L1B: L1A + geo - > L1B https://seadas.gsfc.nasa.gov/help-8.1.0 ... s_L1B.html
l2gen: L1B + geo -> L2 https://seadas.gsfc.nasa.gov/help-8.1.0 ... L2gen.html

suthagar
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Re: Deriving chlorophyll from MODIS AQUA L1 data is Advisable

by suthagar » Thu Dec 09, 2021 11:25 am America/New_York

Thanks for your time...and how to do atmosphere corrections in seadas

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Re: Deriving chlorophyll from MODIS AQUA L1 data is Advisable

by OB SeaDAS - xuanyang02 » Thu Dec 09, 2021 1:11 pm America/New_York

In SeaDAS l2gen GUI, click Processing Option tab, you can toggle "atmocor" on -- https://seadas.gsfc.nasa.gov/help-8.1.0 ... PTIONS_TAB

Here is more regarding aer_opt: https://oceancolor.gsfc.nasa.gov/forum/ ... l?tid=7026

suthagar
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Re: Deriving chlorophyll from MODIS AQUA L1 data is Advisable

by suthagar » Fri Dec 10, 2021 1:59 am America/New_York

I could not find L1 MODIS AQUA L1 data in EarthData , How to find L1 data ?

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Re: Deriving chlorophyll from MODIS AQUA L1 data is Advisable

by OB.DAAC - amscott » Fri Dec 10, 2021 8:46 am America/New_York

You can find MODIS Aqua L1 data on Earthdata Seach by using the search bar and facets on the left side of the screen as seen in the image attached. the URL will be appended with your selections for quick reference as seen above.
Screen Shot 2021-12-10 at 8.45.30 AM.png
Screen Shot 2021-12-10 at 8.45.30 AM.png (321.5 KiB) Not viewed yet

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Re: Deriving chlorophyll from MODIS AQUA L1 data is Advisable

by OB SeaDAS - xuanyang02 » Fri Dec 10, 2021 10:29 am America/New_York

Here is direct access to MODIS AQUA Data --https://oceandata.sci.gsfc.nasa.gov/dir ... ODIS-Aqua/ or you can use the Level 1& 2 Browser -- https://oceancolor.gsfc.nasa.gov/cgi/browse.pl?sen=amod

If you are not familiar with SeaDAS or NASA OB.DACC, here is an intro -- https://seadas.gsfc.nasa.gov/docs/SeaDAS_Intro.pdf. Current SeaDAS version is 8.1.0 and you can download it here -- https://seadas.gsfc.nasa.gov/downloads/

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