Search found 265 matches

by OB SeaDAS - dshea
Wed Feb 12, 2025 9:48 am America/New_York
Forum: Home
Question: Reprojecting S3B-OLCI Level-2 Reduced Resolution to GeoTIFF
Replies: 2

Re: Reprojecting S3B-OLCI Level-2 Reduced Resolution to GeoTIFF

Nothing about this file jumps out as a problem. Seadas had no problem displaying this L2 file.
S3B_OLCI_ERRNT_20250101T164657_L2_IOP_NRT_a_443.png
S3B_OLCI_ERRNT_20250101T164657_L2_IOP_NRT_a_443.png (26.42 KiB) Not viewed yet
Maybe GDAL has a problem with full orbit files that cross the dateline.
by OB SeaDAS - dshea
Fri Oct 11, 2024 10:45 am America/New_York
Forum: Home
Question: Map coefficient of variation (CV) and standard deviation (STD)
Replies: 1

Re: Map coefficient of variation (CV) and standard deviation (STD)

You can add a modifier to the product requested to get different values out of the bin file. From the l3mapgen help: product (string) = comma separated list of products. Each product can have an optional colon and modifier appended. For example, "product=chlor_a,chlor_a:stdev,Kd_490:nobs" ...
by OB SeaDAS - dshea
Thu Sep 26, 2024 3:22 pm America/New_York
Forum: Home
Question: SeaDAS Reprojection OCI data
Replies: 1

Re: SeaDAS Reprojection OCI data

I can not speak about the error message, but the reprojection looks correct. L1B and L2 products are geolocated, but the lines and pixels are as the satellite saw them. The distortion you see is "most likely" due to OCI tilting in the bottom of your image. You can also notice the glint in ...
by OB SeaDAS - dshea
Wed Aug 07, 2024 2:58 pm America/New_York
Forum: Home
Question: How to deal with the drift in water in the 412-660 band after Rayleigh scattering of GOCI by using Seadas-ocsSW's l2gen?
Replies: 2

Re: How to deal with the drift in water in the 412-660 band after Rayleigh scattering of GOCI by using Seadas-ocsSW's l2

The rayleigh correction done by l2gen is different for land and water pixels. If the geolocation of the sensor is off by a bit then you will see a difference on land/water interfaces.

don
by OB SeaDAS - dshea
Tue Aug 06, 2024 2:29 pm America/New_York
Forum: Home
Question: How to convert the 'time_rec' into UTC in Ocean color L3 binned data
Replies: 1

Re: How to convert the 'time_rec' into UTC in Ocean color L3 binned data

Not sure how useful the time_rec is, but this is what is stored. time_rec is the mean of the time for each pixel added to the bin. Actually, we only use the time for each line. The time is a float of TAI93. That would be the number of TAI seconds since Jan 1, 1993. The normal epoch for TAI is 1958, ...
by OB SeaDAS - dshea
Fri Jul 26, 2024 10:13 am America/New_York
Forum: Home
Question: l2gen invalid proc_uncertainty argument
Replies: 2

Re: l2gen invalid proc_uncertainty argument

I had a few problems with the mac and/or the RedHat build server being down while making the "T" tags around that time. The latest tag is T2024.21 and are test tags for a reason. All of the build machines have been working for the last many tags, so a later tag should behave the same on th...
by OB SeaDAS - dshea
Wed Jul 10, 2024 11:01 am America/New_York
Forum: Home
Question: Level-2 format change?
Replies: 6

Re: Level-2 format change?

Thanks for pointing the units out. We are deleting the "photons" to make them CF compliant.

don
by OB SeaDAS - dshea
Mon Jul 08, 2024 4:29 pm America/New_York
Forum: Home
Question: Level-2 format change?
Replies: 6

Re: Level-2 format change?

Yes, the L2 file format has changed. Since we have not used sub-sampling of the the lat/lon arrays in over 20 years, we decided to simplify the L2 file. This change also gave other 3rd party programs the ability to geolocate the variables (ie. chlor_a) now that they have the same dimensions as lat/l...
by OB SeaDAS - dshea
Thu Jun 20, 2024 11:35 am America/New_York
Forum: Home
Question: SNPP VIIRS issue processing SST
Replies: 5

Re: SNPP VIIRS issue processing SST

The Error you listed does not come from running l2bin. Errors like that come from running calibrate_viirs or geolocate_viirs. using the L2 file that we have on our system for this time period, l2bin runs fine. This is the L2 file the processing system currently has: SNPP_VIIRS.20240619T204201.L2.SST...
by OB SeaDAS - dshea
Wed May 08, 2024 8:41 am America/New_York
Forum: Home
Question: PACE l2gen
Replies: 2

Re: PACE l2gen

Right now the only aerosol option that works with OCI is

aer_opt=-18

I will look into why l2gen is seg faulting. Not nice.

don