Search found 1464 matches

by OB.DAAC - SeanBailey
Thu May 04, 2023 7:58 am America/New_York
Forum: Home
Question: Loading "Aqua MODIS Global Binned Chlorophyll (CHL) Data, version R2022.0" into ArcGIS
Replies: 4

Re: Loading "Aqua MODIS Global Binned Chlorophyll (CHL) Data, version R2022.0" into ArcGIS

The binned file format is not a raster format and cannot be read by GIS tools...it's also not a 3D product, rather it is essentially spreadsheet... it's complicated ;) . However, the mapped product that we distribute (which are generate from the binned product) are 2D rasters that can be loaded into...
by OB.DAAC - SeanBailey
Tue May 02, 2023 11:59 am America/New_York
Forum: Home
Question: Significant errors in ocean data
Replies: 1

Re: Significant errors in ocean data

The cause has been identified and corrected. Reprocessed imagery should be available in Worldview soon.

Regards,
Sean
by OB.DAAC - SeanBailey
Tue May 02, 2023 11:58 am America/New_York
Forum: Home
Question: L2 Sea Surface Temperature Unusable
Replies: 1

Re: L2 Sea Surface Temperature Unusable

The cause has been identified and corrected. Reprocessed imagery should be available in Worldview soon.

Regards,
Sean
by OB.DAAC - SeanBailey
Fri Apr 14, 2023 3:29 pm America/New_York
Forum: Home
Question: Question About Chlorophyll Concentration Disparity
Replies: 7

Re: Question About Chlorophyll Concentration Disparity

I did not mean to suggest that the sensor degradation was the sole reason for differences you see between Hawkeye and MODIS-Aqua. In fact, most of the degradation occurred during the extended commissioning phase. While the instrument likely continues to degrade, the rate of change over time is much ...
by OB.DAAC - SeanBailey
Thu Apr 13, 2023 8:26 am America/New_York
Forum: Home
Question: Dealing with the negative Rrs values in NASA OC products
Replies: 1

Re: Dealing with the negative Rrs values in NASA OC products

Negative Rrs retrievals is the result of an atmospheric correction issue, most often an over estimate of the atmospheric aerosol contribution. Negative TOA reflectance, well that's just bad data. It should not be a common situation. If you are finding it to be more than an extremely rare condition, ...
by OB.DAAC - SeanBailey
Wed Apr 05, 2023 3:20 pm America/New_York
Forum: Home
Question: max number of PACE products processed by l2bin
Replies: 1

Re: max number of PACE products processed by l2bin

Bruce, I don't have an answer for you except to say that getting the binner to be happy with the insane number of products that OCI will produce is actively being worked :). I do know that there was a memory issue that was identified and resolved, perhaps that was affecting your processing. This and...
by OB.DAAC - SeanBailey
Wed Apr 05, 2023 3:12 pm America/New_York
Forum: Home
Question: Question About Chlorophyll Concentration Disparity
Replies: 7

Re: Question About Chlorophyll Concentration Disparity

There are a number of possible reasons for the differences you see. There certainly is some level of degradation in the Hawkeye instrument over time (see: https://oceancolor.gsfc.nasa.gov/data/hawkeye/on-orbit-changes/), however there is currently no way to account for any temporal changes in the ra...
by OB.DAAC - SeanBailey
Wed Apr 05, 2023 3:04 pm America/New_York
Forum: Home
Question: OLCI level 1 raw data geo-offset along GreatLakes?
Replies: 2

Re: OLCI level 1 raw data geo-offset along GreatLakes?

This is a question to bring up with the ESA or Eumetsat Copernicus teams. We do not control the geolocation process for the Sentinel missions.

Regards,
Sean
by OB.DAAC - SeanBailey
Fri Mar 31, 2023 11:12 am America/New_York
Forum: Home
Question: V2023.0 -- MODIS L1A processing failed
Replies: 7

Re: V2023.0 -- MODIS L1A processing failed

The issue is that the LUT updates required for the update MODIS L1A and GEO codes failed to be included in the V2023.0 release. This will be corrected soon (and you'll see V2023.1). The proper LUTs are available in the T2023.7 test tag.

Sean
by OB.DAAC - SeanBailey
Wed Mar 22, 2023 3:40 pm America/New_York
Forum: Home
Question: l2gen on LANDSAT 8,why I cant get NIR band?
Replies: 3

Re: l2gen on LANDSAT 8,why I cant get NIR band?

One thing to keep in mind is that the NIR Rrs is that the atmospheric correction applied to OLI use the 865nm and 1609nm bands. The basic assumption for the atmospheric correction algorithm (well, the aerosol retrieval portion) is that the NIR bands have zero contribution from the water - thus the e...