Search found 1324 matches

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...
by OB.DAAC - SeanBailey
Fri Sep 30, 2022 8:56 am America/New_York
Forum: Questions/Comments
Question: MODIS AQUA SST unit
Replies: 2

Re: MODIS AQUA SST unit

Did you apply the scaling factor? The SST mapped product is stored as a scaled short integer. To get the correct floating point value, you need to apply the scale_factor and add_offset (although the offset is zero for this product): short sst(lat, lon) ; sst:long_name = "Sea Surface Temperature...
by OB.DAAC - SeanBailey
Fri Sep 30, 2022 8:46 am America/New_York
Forum: Questions/Comments
Question: VIIRS/SNPP
Replies: 6

Re: VIIRS/SNPP

Thanks, we'll fix that ASAP.

Sean
by OB.DAAC - SeanBailey
Thu Sep 29, 2022 6:55 am 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

Brendan,
Nice catch...The units of F0 on that page are incorrect and should be W/m^2/um (nLw are W/m^2/um/sr).
We'll update the web documentation.

Thanks,
Sean
by OB.DAAC - SeanBailey
Thu Sep 29, 2022 6:46 am America/New_York
Forum: Questions/Comments
Question: VIIRS/SNPP
Replies: 6

Re: VIIRS/SNPP

The forward stream for both the SNPP_VIIRS and NOAA20_VIIRS instruments was paused while we reconfigure our production system to prepare for the R2022 reprocessing. The data flow should resume later today.

Regards,
Sean