Search found 61 matches

by OB.DAAC - SeanBailey
Tue Sep 23, 2025 9:48 am America/New_York
Forum: Home
Question: MODIS Average quality level
Replies: 7

Re: MODIS Average quality level

It has nothing to do with the "latband" coefficients. There is an explicitly defined geographic box where that test is applied: const float equatorialNorth = 30.0; // the ranges where SST diff tests are applied const float equatorialSouth = -10.0; const float equatorialWest = -105.0; const...
by OB.DAAC - SeanBailey
Mon Sep 22, 2025 3:19 pm America/New_York
Forum: Home
Question: How to Correct Scan-Line Striping in SeaDAS Chlorophyll-a Product from Sentinel-2?
Replies: 1

Re: How to Correct Scan-Line Striping in SeaDAS Chlorophyll-a Product from Sentinel-2?

l2gen has a filtering feature (defined by filter_opt and filter_file). There is a default filter file for MSI, but I don't think it is enabled by default (i.e. filter_opt=0 is set). You can try enabling it to see if that improves the result (filter_opt=1). You can also try modifying the filter_file ...
by OB.DAAC - SeanBailey
Mon Sep 22, 2025 3:07 pm America/New_York
Forum: Home
Question: Rayleigh-corrected reflectance (Rrc(λ))
Replies: 2

Re: Rayleigh-corrected reflectance (Rrc(λ))

To add to Minwei's response... rhos also accounts for gaseous absorption (in addition to simple Rayleigh scattering). It does not require "atmospheric correction" (really, aerosol correction...we're bad at being clear about what the parameters do), so you can set atmocor=0 to speed up the ...
by OB.DAAC - SeanBailey
Mon Sep 22, 2025 8:43 am America/New_York
Forum: Home
Question: MODIS Average quality level
Replies: 7

Re: MODIS Average quality level

This is most definitely an artifact of the cloud screening algorithm. There is an explicit test applied to the region you identified. That test sets the quality flag to a minimum of 2 (and sets the SSTREFDIFF bit in the flags_sst for that pixel) if the computed SST value is significantly less than t...
by OB.DAAC - SeanBailey
Fri Sep 12, 2025 10:25 am America/New_York
Forum: Home
Question: SeaDAS new l2gen very slow
Replies: 17

Re: SeaDAS new l2gen very slow

Yes, a test tag with this fix is being prepped and should be available sometime next week. It will take a little longer to get into a release tag, but as SeaDAS is planning another release in October, it shouldn't be too long of a wait :D

Regards,
Sean
by OB.DAAC - SeanBailey
Thu Sep 11, 2025 10:05 am America/New_York
Forum: Home
Question: SeaDAS new l2gen very slow
Replies: 17

Re: SeaDAS new l2gen very slow

Roger,

Yep, that was discovered recently by Alex as well and will be corrected in an upcoming release. The wee bit o'code whoopsie that caused the woe was introduced in August 2024 (in the source code),which jives with Fred's report that the slowness began with V2025.1.

Regards,
Sean
by OB.DAAC - SeanBailey
Thu Sep 11, 2025 9:39 am America/New_York
Forum: Home
Question: Trouble accessing OPeNDAP to download PACE data
Replies: 4

Re: Trouble accessing OPeNDAP to download PACE data

Yes, this was a temporary issue. The service has been restored.
Regards,
Sean
by OB.DAAC - SeanBailey
Thu Aug 28, 2025 9:14 am America/New_York
Forum: Home
Question: MODIS-Aqua L2 (1 km)
Replies: 1

Re: MODIS-Aqua L2 (1 km)

You can use Earthdata Search to identify and retrieve the data or your region of interest. The following link will take you to the OB.DAAC portal and display the MODIS L2 collections: https://search.earthdata.nasa.gov/search?portal=obdaac&fi=MODIS&fl=2%2B-%2BGeophys.%2BVariables%252C%2BSenso...
by OB.DAAC - SeanBailey
Fri Aug 22, 2025 11:56 am America/New_York
Forum: Home
Question: l3bin fails with error code -11 when there are 475 input files
Replies: 2

Re: l3bin fails with error code -11 when there are 475 input files

The l3bin code is some old code and sets up a number of static arrays with what is normally enough space to do its work...and as such it has a hard-coded file limit of 256. Line 26 of l3bin.cpp : #define MAXNFILES 256 I suppose it could be recompiled setting that #define to 512...it should work... (...
by OB.DAAC - SeanBailey
Tue Aug 19, 2025 2:26 pm America/New_York
Forum: Home
Question: PACE Rrs products in the NIR bands (720-895 nm)
Replies: 2

Re: PACE Rrs products in the NIR bands (720-895 nm)

Masud, Unfortunately, the l2gen code has a hard limit of 720nm for Rrs output. It has to do with the way the atmospheric correction process works. We have been mulling over the possibility of expanding the output for PACE-OCI, since it does have bands longer than 720nm that are not used in the aeros...