Search found 34 matches

by OB General Science - guoqingw
Mon Aug 08, 2022 3:04 pm America/New_York
Forum: Questions/Comments
Question: Sentinel-2 with l2gen
Replies: 17

Re: Sentinel-2 with l2gen

Hi, The error happens because Sentinel 2A MSI lacks a band around 412nm, which means QAA (https://www.ioccg.org/groups/software.html) is not applicable to MSI. It requires 5 bands in total (412,443,490,555, and 670 nm) but MSI only has 4 of them. My suggestion is changing the iop_opt=3 to iop_opt=7 ...
by OB General Science - guoqingw
Mon Aug 08, 2022 1:15 pm America/New_York
Forum: Questions/Comments
Question: Extract chlorophyll -a
Replies: 2

Re: Extract chlorophyll -a

Adding on to Bing's answer, you can following the tutorial on this page for Pixel Extraction using SeaDAS:
https://seadas.gsfc.nasa.gov/help-8.2.0/pixelExtraction/PixelExtraction.html

Guoqing
by OB General Science - guoqingw
Tue Jul 19, 2022 2:18 pm America/New_York
Forum: Questions/Comments
Question: CDOM retrievals with SeaDAS from ACOLITE derived Rrs
Replies: 3

Re: CDOM retrievals with SeaDAS from ACOLITE derived Rrs

Dulci,

Unfortunately, you can only use OCSSW l2gen to produce adg from level 1 data (l1c for sentinel 2).
Here is the algorithm description for IOP including adg443:
https://oceancolor.gsfc.nasa.gov/atbd/giop/
by OB General Science - guoqingw
Tue Jul 19, 2022 11:26 am America/New_York
Forum: Questions/Comments
Question: Water quality data
Replies: 3

Re: Water quality data

I just did a search on the L1/L2 browser, it works. Can you try again? We had worked on restoring the OB.DAAC L1/L2 database in the past several days. Probably that was the reason.
by OB General Science - guoqingw
Tue Jul 19, 2022 9:19 am America/New_York
Forum: Questions/Comments
Question: modis_GEO SeaDAS
Replies: 2

Re: modis_GEO SeaDAS

We are working on restoring the data for L1. Stay tuned.
by OB General Science - guoqingw
Mon Jul 18, 2022 11:52 pm America/New_York
Forum: Questions/Comments
Question: CDOM retrievals with SeaDAS from ACOLITE derived Rrs
Replies: 3

Re: CDOM retrievals with SeaDAS from ACOLITE derived Rrs

Hi Dulci,

Which CDOM product are you referring to?
I'm not sure how ACOLITE handles Rrs outputs and whether they are consistent with NASA standard products.

SeaDAS help page of l2gen:
https://seadas.gsfc.nasa.gov/help-8.2.0/processors/ProcessL2gen.html

Guoqing
by OB General Science - guoqingw
Mon Jul 18, 2022 11:29 pm America/New_York
Forum: Questions/Comments
Question: Water quality data
Replies: 3

Re: Water quality data

Can you provide more information about which website/page are you using? What date, time, and lat/lon?
by OB General Science - guoqingw
Mon Jul 11, 2022 12:01 pm America/New_York
Forum: Questions/Comments
Question: Missing MODIS L1A files in our subscription since 2 days
Replies: 7

Re: Missing MODIS L1A files in our subscription since 2 days

Hi Jacques,

The problem has been fixed. Please double check.

Guoqing
by OB General Science - guoqingw
Mon Jul 11, 2022 11:15 am America/New_York
Forum: Questions/Comments
Question: Level 3 VIIRS CHL Product
Replies: 2

Re: Level 3 VIIRS CHL Product

Hi Mark, Yes, we provide daily VIIRS level 3 mapped data at 4km resolution and more. There are several ways to download the data. On ocean color website (https://oceancolor.gsfc.nasa.gov/), under the "Data" button, you can click "Direct Data Access", and it will jump to the data ...
by OB General Science - guoqingw
Mon Jul 11, 2022 9:14 am America/New_York
Forum: Questions/Comments
Question: [SeaBASS - MODISA] SST retrieval at night
Replies: 5

Re: [SeaBASS - MODISA] SST retrieval at night

Hi, The SST product you downloaded should be the most recent R2019 version. Here is the document about it: https://oceancolor.gsfc.nasa.gov/reprocessing/r2019/sst/ Details about the algorithms used in SST: https://oceancolor.gsfc.nasa.gov/atbd/sst/ https://oceancolor.gsfc.nasa.gov/atbd/sst4/ https:/...