Search found 1358 matches

by OB.DAAC - SeanBailey
Tue Oct 18, 2022 2:21 pm America/New_York
Forum: Questions/Comments
Question: I want to convert kd490 unit
Replies: 5

Re: I want to convert kd490 unit

Sure, Kd490 can be used as a proxy for turbidity, with the caveats I mentioned earlier. As Jim points out that euphotic depth can also be used as a proxy for turbidity - euphotic depth is the 1% light level. In my earlier post I suggested you may consider deriving the first optical depth - the 37% l...
by OB.DAAC - SeanBailey
Tue Oct 18, 2022 10:51 am America/New_York
Forum: Questions/Comments
Question: R2022 processing
Replies: 3

Re: R2022 processing

Mati, Not a silly question at all. The second element of the returned CSV is the filename, while the fifth element is the URL to download the file. So, you could do something as simple as this: $ curl --silent -d "page_size=2000&sort_key=short_name&sort_key=start_date&short_name=Sea...
by OB.DAAC - SeanBailey
Mon Oct 17, 2022 3:04 pm America/New_York
Forum: Questions/Comments
Question: MODIS Terra geolocation files
Replies: 4

Re: MODIS Terra geolocation files

When we reprocess the MODIS Terra ocean color data as part of the R2022 reprocessing effort, we will begin archiving and distributing the geolocation files as we did when we reprocessed MODIS Aqua. So, it's coming...soon.

Sean
by OB.DAAC - SeanBailey
Mon Oct 17, 2022 10:59 am America/New_York
Forum: Questions/Comments
Question: R2022 processing
Replies: 3

Re: R2022 processing

Mati, I'm assuming you're not finding the data on the L1/2 browser...the reason is complicated, but boils down to the fact that the L1 filenames were forced to have a start time that matched the start time for the GAC file of the orbit containing the LAC data. With our new naming convention, we're e...
by OB.DAAC - SeanBailey
Wed Oct 12, 2022 12:57 pm America/New_York
Forum: Questions/Comments
Question: I want to convert kd490 unit
Replies: 5

Re: I want to convert kd490 unit

Well, Kd490 is not a measure of turbidity, it's a measure of diffuse attenuation. Turbidity is effectively a measure of scattering. While scattering is part of attenuation, it is not everything, as attenuation also includes absorption. So there is a relationship between turbidity and Kd490, but it i...
by OB.DAAC - SeanBailey
Tue Oct 11, 2022 1:34 pm America/New_York
Forum: Questions/Comments
Question: An error when processing viirs Ibands with Seadas
Replies: 8

Re: VIIRS-JPSS1 l2gen failure after R2022.14 tag instalation

Josep, Seems we missed a required modification to the LutUtils.py code. For the previous reprocessing, JPSS1_VIIRS did not require an xcal file, so LutUtils.py didn't look for them to pull down. Until we can get the change into a tag, you can make the following change to $OCSSW_BIN/seadasutils/LutUt...
by OB.DAAC - SeanBailey
Fri Oct 07, 2022 1:19 pm America/New_York
Forum: Questions/Comments
Question: An error when processing viirs Ibands with Seadas
Replies: 8

Re: An error when processing viirs Ibands with Seadas

NOAA provides a surface reflectance product that includes the I-bands: https://www.ospo.noaa.gov/Products/land/sr/
by OB.DAAC - SeanBailey
Thu Oct 06, 2022 10:43 am America/New_York
Forum: Questions/Comments
Question: OB DAAC data on AWS
Replies: 2

Re: OB DAAC data on AWS

Not yet. We are working on it, but I cannot give a date. Well, I could, but it very likely wouldn't be a realistic one :D
OK...here's one: Dec 2023.

It is my *hope* to have some of our data available in the Earthdata Cloud by the end of 2023...but no promises.

Sean
by OB.DAAC - SeanBailey
Wed Oct 05, 2022 2:17 pm America/New_York
Forum: Questions/Comments
Question: Question related to Chl-a Algorithm
Replies: 2

Re: Question related to Chl-a Algorithm

Quite the loaded question ;) The Southern Ocean is big and most of it is quite far from civilization. This makes obtaining in situ validation data a challenge to say the least. As a result, the spatial and temporal sampling is rather skewed and probably not applicable to the entire Southern Ocean. T...
by OB.DAAC - SeanBailey
Wed Oct 05, 2022 8:42 am America/New_York
Forum: Questions/Comments
Question: l2_flags
Replies: 2

Re: l2_flags

That flag will become "OPSHAL" (optically shallow water). It is not fully validated yet, so it's still "hidden" as SPARE23...apparently not well hidden ;)

Sean