Search found 110 matches

by OB General Science - guoqingw
Fri Aug 18, 2023 10:45 pm America/New_York
Forum: Home
Question: NASA OceanColor Website Access
Replies: 4

Re: NASA OceanColor Website Access

Hello, is the issue persistent across various computers and under different internet environments (e.g. home or school internet)? We updated our website about a month ago. You may want to try clear your cache and reload the website again.
by OB General Science - guoqingw
Mon Jul 24, 2023 3:52 pm America/New_York
Forum: Home
Question: Relationship between various temporal PIC products
Replies: 2

Re: Relationship between various temporal PIC products

Here is the technical report regarding our L3 binning scheme:
https://oceancolor.gsfc.nasa.gov/SeaWiFS/TECH_REPORTS/PreLPDF/PreLVol32.pdf

With the website updating, please let me know if the link fails.
by OB General Science - guoqingw
Mon Jul 24, 2023 11:51 am America/New_York
Forum: Home
Question: CZCS bands to calculate FU index
Replies: 4

Re: CZCS bands to calculate FU index

Hi Dionysia,

As Forel-Ule Index is not one of our products, I cannot make comments on it. My suggestion is reviewing more literatures on this topic.
by OB General Science - guoqingw
Mon Jul 24, 2023 11:12 am America/New_York
Forum: Home
Question: Kd490 data VIIRS vs MODIS
Replies: 7

Re: Kd490 data VIIRS vs MODIS

To add on to Sean and Alicia's replies. Here is the help page for data processors including "l3mapgen": https://seadas.gsfc.nasa.gov/help-8.3.0/processors/ProcessOverview.html
by OB General Science - guoqingw
Fri Jul 14, 2023 2:28 pm America/New_York
Forum: Home
Question: Ocean Color Browser not showing Sentinel images
Replies: 7

Re: Ocean Color Browser not showing Sentinel images

Yes, if you take a close look at the file names, you will find the ones with "FR" are in full resolution and "RR" in reduced resolution.
by OB General Science - guoqingw
Mon Jul 10, 2023 3:10 pm America/New_York
Forum: Home
Question: Ocean Color Browser not showing Sentinel images
Replies: 7

Re: Ocean Color Browser not showing Sentinel images

Sorry about that. We have noticed the issue. The team is in developing of a new L1/2 browser. Before the issue is resolved or the new browser published, you can access the data you want through direct data access: https://oceandata.sci.gsfc.nasa.gov/directdataaccess/Level-2/
by OB General Science - guoqingw
Mon Jul 10, 2023 10:46 am America/New_York
Forum: Home
Question: Land pixel definition in MODIS SST/ Chlorophyll level 3 data
Replies: 1

Re: Land pixel definition in MODIS SST/ Chlorophyll level 3 data

Hi, not sure what you are trying to do, but here is the tech doc for the land/water mask: https://oceancolor.gsfc.nasa.gov/resources/docs/technical/odps_land_mask.pdf

Hope it helps.
by OB General Science - guoqingw
Wed May 31, 2023 3:36 pm America/New_York
Forum: Home
Question: Request for water leaving radiance and normalized water leaving radiance of particular region-MODIS aqua
Replies: 1

Re: Request for water leaving radiance and normalized water leaving radiance of particular region-MODIS aqua

There are many ways to get the data you need. We provide reflectance, but it's not difficult to get normalized water-leaving radiance from reflectance. You can do search and download: https://oceancolor.gsfc.nasa.gov/data/download_methods/ For monthly and/annual mean, you can also use level 3/4 brow...
by OB General Science - guoqingw
Wed May 31, 2023 8:52 am America/New_York
Forum: Home
Question: l2gen algorithm - source code error
Replies: 4

Re: l2gen algorithm - source code error

Lachlan is correct. chl1 is the chlorophyll estimated using CI algorithm (the parameters are from Hu et al. 2019) which performs better for low values. Here it was used to find the upper limit for the blending of CI and OCx algorithm to make sure low values are estimated using CI algorithm.
by OB General Science - guoqingw
Tue May 30, 2023 3:50 pm America/New_York
Forum: Home
Question: Interpretation of the Aqua-MODIS scene
Replies: 1

Re: Interpretation of the Aqua-MODIS scene

Hi,
That is one of the magic pictures produced by one of our retired scientists.
Here is a thread that he answered questions similar to yours and more:
viewtopic.php?f=7&t=1237

Hope you find it helpful,
Guoqing