Search found 80 matches

by OB General Science - guoqingw
Wed Jul 17, 2024 10:42 am America/New_York
Forum: Home
Question: CHLOROPHYLL CONCENTRATION (1 MONTH - AQUA/MODIS)
Replies: 2

Re: CHLOROPHYLL CONCENTRATION (1 MONTH - AQUA/MODIS)

You can also download the MODIS monthly Chla from L3/4 browser, or try the methods described here: https://oceancolor.gsfc.nasa.gov/data/download_methods/

Let us know if you find these helpful.
Guoqing
by OB General Science - guoqingw
Mon Jul 15, 2024 10:56 am America/New_York
Forum: Home
Question: How to download a large number of MODIS L2 Ocean Color data files to a PC
Replies: 1

Re: How to download a large number of MODIS L2 Ocean Color data files to a PC

Hello,

You can download multiple files using the methods described on this webpage: Data Search and Download Methods.

Please try these methods and let us know if you find them helpful.

Thank you.
Guoqing
by OB General Science - guoqingw
Fri Jul 12, 2024 2:23 pm America/New_York
Forum: Home
Question: Unable to access Level 1&2 Browser Help from South Africa
Replies: 7

Re: Unable to access Level 1&2 Browser Help from South Africa

Hello,

Do you have access to other ocean color webpages? If not, please send a note to:

connection_problems@oceancolor.sci.gsfc.nasa.gov

And indicate the IP address(es).

Thank you.
Guoqing
by OB General Science - guoqingw
Fri Apr 05, 2024 9:28 am America/New_York
Forum: Home
Question: Threshold Definition
Replies: 3

Re: Threshold Definition

They are global algorithms, based on similar assumptions, and use the blue-green band ratios. Chlorophyll algorithm is a little complicated with the blend of a band difference and band ratio algorithms.
by OB General Science - guoqingw
Thu Mar 21, 2024 10:28 am America/New_York
Forum: Home
Question: Chlorophyll and temperature data
Replies: 4

Re: Chlorophyll and temperature data

Hello, if you downloaded the data from oceancolor website, to better help with this question, can you share one of the file's name you have got? This will help us identify which level (L2 or L3) and what format of data you are using.
by OB General Science - guoqingw
Thu Dec 07, 2023 10:06 am America/New_York
Forum: Home
Question: getanc socket.timeout
Replies: 6

Re: getanc socket.timeout

@tlin2_cuny.edu @haag
Please email "connection_problems@oceancolor.gsfc.nasa.gov" with the public ip address you are connection from, the time you tried to connect and a short description of the network issue you are experiencing. The NASA OBPG network team will assist you.
by OB General Science - guoqingw
Thu Dec 07, 2023 10:05 am America/New_York
Forum: Home
Question: Cannot resolve domain using wget.
Replies: 6

Re: Cannot resolve domain using wget.

Please email "connection_problems@oceancolor.gsfc.nasa.gov" with the public ip address you are connection from, the time you tried to connect and a short description of the network issue you are experiencing. The NASA OBPG network team will assist you.
by OB General Science - guoqingw
Tue Dec 05, 2023 10:44 am America/New_York
Forum: Home
Question: Threshold Definition
Replies: 3

Re: Threshold Definition

Hello, The POC algorithm is mainly for open ocean or Case 1 waters, and it relies on the fact that variation in Rrs(λ) at blue wavelengths are primarily driven by phytoplankton pigments and covarying matters. For coastal or optically complex case 2 waters, the empirical relationship used in the algo...
by OB General Science - guoqingw
Thu Nov 30, 2023 12:04 pm America/New_York
Forum: Home
Question: Chlorophyll-a algorithm & sediment contamination
Replies: 1

Re: Chlorophyll-a algorithm & sediment contamination

Hi, First of all, here is the theoretic basis for the standard Chlorophyll-a algorithm we use: https://oceancolor.gsfc.nasa.gov/resources/atbd/chlor_a/. Second, yes, for coastal regions, the standard Chlorophyll-a values tend to be higher due to the optical complexity of the water. That said, the op...