Search found 1354 matches

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
by OB.DAAC - SeanBailey
Mon Oct 03, 2022 1:20 pm America/New_York
Forum: Questions/Comments
Question: Nomenclature of VIIRS L2 differs by 1 sec from L1A and GEO
Replies: 1

Re: Nomenclature of VIIRS L2 differs by 1 sec from L1A and GEO

This is not unexpected. The same issue exists with the MODIS filenames. Both MODIS and VIIRS L1 files are "chopped" into 5 (or 6) minute granules, but the scan rate for the sensors does not fall exactly on the 5 (or 6) minute boundaries. The L2 filenames are derived from the actual time of...
by OB.DAAC - SeanBailey
Fri Sep 30, 2022 4:16 pm America/New_York
Forum: Questions/Comments
Question: Question about OceanColor solar irradiance (F0) and nLw units
Replies: 5

Re: Question about OceanColor solar irradiance (F0) and nLw units

The Rrs values are typically reported as 10nm wide square band values. The F0 values on the rsr_tables page are fully convolved with the sensor spectral response function. This is not the nominal 10nm square band value. So, the value in the metadata of the L2 file in question is the one to use, as i...
by OB.DAAC - SeanBailey
Fri Sep 30, 2022 4:12 pm America/New_York
Forum: Questions/Comments
Question: SeaDAS version and R2022
Replies: 7

Re: SeaDAS version and R2022

You can get the old LUTs back (see my response here: https://forum.earthdata.nasa.gov/viewtopic.php?p=12674#p12674), but if you want to update, go with R2022.14. The 'R' series is the new 'V', and once we get through ALL the missions we're reprocessing, a new 'V' tag will be defined (which will be e...
by OB.DAAC - SeanBailey
Fri Sep 30, 2022 3:54 pm America/New_York
Forum: Questions/Comments
Question: VIIRS/SNPP
Replies: 6

Re: VIIRS/SNPP

Yuyuan, If your LUTs were updated (and since the error reports it can't find the v3.0.0.2 lut, I'd say they were), your options are to update to a compatible R tag (R2022.12 or later ...best to use the current latest R2022.14) or restore the older LUTS to your $OCVARROOT/viirsn/cal/OPER tree. You ca...