Search found 1224 matches

by OB.DAAC - SeanBailey
Tue Oct 19, 2021 2:24 pm America/New_York
Forum: Questions/Comments
Question: Degraded Ocean Color data
Replies: 3

Re: Degraded Ocean Color data

It is. There was an indication from the OMI/TOMS team that it was resolved about a month ago, but in our testing we identified a residual effect of the underlying cause. The bulk of the problem was corrected, but we are still waiting on the OMI/TOMS team to provide a fix for this secondary issue. .....
by OB.DAAC - SeanBailey
Mon Oct 18, 2021 11:17 am America/New_York
Forum: Questions/Comments
Question: How to create VIIRS L1A from L0?
Replies: 5

Re: How to create VIIRS L1A from L0?

The VIIRS L1A products we distribute are available as soon as we receive the L0 data. The L0 data are in orbit-based (nominally 90 minutes) which are replaced by 2-hour PDS files. The orbit based files are available with a sub-3hour latency and the 2-hour replay (and the official archive product) wi...
by OB.DAAC - SeanBailey
Mon Oct 18, 2021 9:43 am America/New_York
Forum: Questions/Comments
Question: How to run PML algorithm in command line?
Replies: 7

Re: How to run PML algorithm in command line?

To be clear, the PML algorithm in l2gen works when the source data is a satellite L1 file. It only has an issue when the source is a SeaBASS-formatted ASCII text file. :D
by OB.DAAC - SeanBailey
Fri Oct 15, 2021 9:12 am America/New_York
Forum: Questions/Comments
Question: How to run PML algorithm in command line?
Replies: 7

Re: How to run PML algorithm in command line?

Ah, well, you're passing in SeaBASS file, not a SeaWiFS file. The PML algorithm requires the view geometry. The l2gen SeaBASS file reader does not populate the geometries. The PML code does not check to see that valid values are passed and when it tries to interpolate the LUT with negative indices (...
by OB.DAAC - SeanBailey
Fri Oct 08, 2021 9:28 am America/New_York
Forum: Questions/Comments
Question: How to process Landsat8 Collection2 L1 data with SeaDAS
Replies: 6

Re: How to process Landsat8 Collection2 L1 data with SeaDAS

Roxani, This is a different question, so should probably be a new thread...but, since I'm here... Landsat is, well, designed for land. The signal-to-noise is a wee bit below what is really required to do ocean color remote sensing - especially for the red bands (a bit better in the shorter wavelengt...
by OB.DAAC - SeanBailey
Fri Oct 08, 2021 9:07 am America/New_York
Forum: Questions/Comments
Question: How to run PML algorithm in command line?
Replies: 7

Re: How to run PML algorithm in command line?

Works for me. Can you provide specifics on the inputs you used (input file and parameters)?

Sean
by OB.DAAC - SeanBailey
Fri Oct 08, 2021 7:32 am America/New_York
Forum: Questions/Comments
Question: Difference between MODIS PAR and iPAR products
Replies: 2

Re: Difference between MODIS PAR and iPAR products

If the documentation doesn't answer your questions, the short answer is:
Clouds.
The daily averaged PAR product includes contributions from cloud covered regions, while the instantaneous ipar is only computed for cloud-free pixels. Most applications would use PAR, not ipar.

Sean
by OB.DAAC - SeanBailey
Wed Oct 06, 2021 10:38 am America/New_York
Forum: Questions/Comments
Question: How to process Landsat8 Collection2 L1 data with SeaDAS
Replies: 6

Re: How to process Landsat8 Collection2 L1 data with SeaDAS

SeaDAS does not yet support Landsat Collection 2 formatted data, neither for visualization nor for data processing. Visualization and data processing do work for Collection 1 formatted data. Unfortunately, we do not have an estimate on when support for Collection 2 will be added.

Regards,
Sean
by OB.DAAC - SeanBailey
Wed Oct 06, 2021 10:00 am America/New_York
Forum: Questions/Comments
Question: OLCI 709 nm band
Replies: 4

Re: OLCI 709 nm band

Yes, that would be the answer :D
Sean
by OB.DAAC - SeanBailey
Tue Oct 05, 2021 4:15 pm America/New_York
Forum: Questions/Comments
Question: OLCI 709 nm band
Replies: 4

Re: OLCI 709 nm band

Vicarious calibration....or rather the lack thereof. Once properly calibrated, the result is more like what you would expect: Screen Shot 2021-10-05 at 4.11.34 PM.png The above was generated from a scene using the following gains: gain=[0.9795,0.9953,0.9796,0.9675,0.9697,0.9695,0.9750,0.9750,0.9744,...