Search found 76 matches
- Thu Mar 21, 2024 10:28 am America/New_York
- Forum: Questions/Comments
- 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.
- Wed Jan 03, 2024 12:04 pm America/New_York
- Forum: Questions/Comments
- Question: What is the specific formula for modis oc2, oc3,oc4? Can it be displayed?
- Replies: 1
Re: What is the specific formula for modis oc2, oc3,oc4? Can it be displayed?
You can find the information on the following ATBD and the corresponding reference:
https://www.earthdata.nasa.gov/apt/documents/chlor-a/v1.0#doc-header
https://www.earthdata.nasa.gov/apt/documents/chlor-a/v1.0#doc-header
- Thu Dec 07, 2023 10:06 am America/New_York
- Forum: Questions/Comments
- 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.
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.
- Thu Dec 07, 2023 10:05 am America/New_York
- Forum: Questions/Comments
- 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.
- Tue Dec 05, 2023 10:44 am America/New_York
- Forum: Questions/Comments
- Question: Threshold Definition
- Replies: 2
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...
- Thu Nov 30, 2023 12:04 pm America/New_York
- Forum: Questions/Comments
- 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...
- Tue Nov 28, 2023 11:15 am America/New_York
- Forum: Questions/Comments
- Question: Aqua MODIS gridded ERDDAP chlorophyll
- Replies: 2
Re: Aqua MODIS gridded ERDDAP chlorophyll
Hi Anna,
ERDDAP database is maintained by NOAA. You may want to try Earthdata Search (https://search.earthdata.nasa.gov/search).
Let me know if you came across any issues.
Guoqing
ERDDAP database is maintained by NOAA. You may want to try Earthdata Search (https://search.earthdata.nasa.gov/search).
Let me know if you came across any issues.
Guoqing
- Mon Oct 30, 2023 4:20 pm America/New_York
- Forum: Questions/Comments
- Question: Accessing and Processing L3 Data in Python with netCDF4
- Replies: 2
Re: Accessing and Processing L3 Data in Python with netCDF4
Hello, We are working on sample python scripts for such purposes. These scripts will be available very soon, but here is an example to get you started: L3 data is stored as variables, and you can use xarray to read them: import xarray as xr # use the following file as an example filename = 'AQUA_MOD...
- Fri Oct 27, 2023 10:14 am America/New_York
- Forum: Questions/Comments
- Question: Data Retrieval Method: Extract or Download?
- Replies: 3
Re: Data Retrieval Method: Extract or Download?
Hi, The discrepancies you've observed primarily stem from comparing local min/max values to global ones. When you download without extraction, you receive the Chlorophyll image for the entire globe. On the other hand, using the extract function allows you to isolate the specific region defined by th...
- Thu Oct 26, 2023 10:53 am America/New_York
- Forum: Questions/Comments
- Question: Chlorophyll product
- Replies: 1
Re: Chlorophyll product
Hi Giovanni, You can find all the information regarding the quality flags on this webpage: https://oceancolor.gsfc.nasa.gov/resources/atbd/ocl2flags/ If you are using the L2 products, the flags and masks are included in the file. One easy way to find those info is opening the data file in SeaDAS. Fo...