Search found 244 matches

by OB SeaDAS - dshea
Thu Dec 01, 2022 4:11 pm America/New_York
Forum: Questions/Comments
Question: What's changes between ocssw V2022.1 and V2022.2?
Replies: 3

Re: What's changes between ocssw V2022.1 and V2022.2?

There was also a change made to process VIIRS J2 files properly:

- fixed tel_start_enc_nominal for VIIRS J2
- fixed missing sgli areosol default LUT

don
by OB SeaDAS - dshea
Tue Nov 29, 2022 10:59 am America/New_York
Forum: Questions/Comments
Question: Chlorophyll product FLAGS
Replies: 1

Re: Chlorophyll product FLAGS

Every Level 2 NetCDF file has a set of flags in the variable l2_flags. Here is a dump of the definition: int l2_flags(number_of_lines, pixels_per_line) ; l2_flags:long_name = "Level-2 Processing Flags" ; l2_flags:valid_min = -2147483648 ; l2_flags:valid_max = 2147483647 ; l2_flags:flag_mas...
by OB SeaDAS - dshea
Mon Nov 21, 2022 10:30 am America/New_York
Forum: Questions/Comments
Question: Is there any algorithm description for SeaDAS OCSSW?
Replies: 6

Re: Is there any algorithm description for SeaDAS OCSSW?

Our git repositories are not accessible to the public. You can use SeaDAS to install a released version of the source code. Use the SeaDAS GUI to install the OCSSW src.

The code is also available on the web if you want to browse:
https://oceancolor.gsfc.nasa.gov/docs/ocssw/ocssw_src

don
by OB SeaDAS - dshea
Thu Oct 27, 2022 9:57 am America/New_York
Forum: Questions/Comments
Question: Where is the Variables of time in the LV3 Chlorophyll data from MODIS-aqua?
Replies: 3

Re: Where is the Variables of time in the LV3 Chlorophyll data from MODIS-aqua?

Monthly data has the days averaged. If you want every day then grab the daily files.

don
by OB SeaDAS - dshea
Mon Oct 24, 2022 10:25 am America/New_York
Forum: Questions/Comments
Question: How to reproject MODIS L2 data via Python?
Replies: 2

Re: How to reproject MODIS L2 data via Python?

You have found the MODIS Bowtie effect. Since the MODIS sensor has 10 detectors that take data on each scan, the position of the edge pixels at the beginning and end of the scan overlap the previous and next scan. Here is a web page describing this in more detail: https://oceancolor.gsfc.nasa.gov/do...
by OB SeaDAS - dshea
Thu Oct 20, 2022 3:31 pm America/New_York
Forum: Questions/Comments
Question: ATMFAIL on northernmost 3 lines in OLCI granules
Replies: 3

Re: ATMFAIL on northernmost 3 lines in OLCI granules

I found the problem with the SAFE file format reader. This will be fixed in the next T and R tags. A value needed by the smile correction was not calculated soon enough. Thanks for finding this.

don
by OB SeaDAS - dshea
Wed Oct 19, 2022 3:38 pm America/New_York
Forum: Questions/Comments
Question: ATMFAIL on northernmost 3 lines in OLCI granules
Replies: 3

Re: ATMFAIL on northernmost 3 lines in OLCI granules

Yes, we see the same problem.
Thanks, we will take a look.

don
by OB SeaDAS - dshea
Fri Jun 17, 2022 11:41 am America/New_York
Forum: Questions/Comments
Question: “msis2a_gas_transmittance.nc” is missing for OCSSW
Replies: 5

Re: “msis2a_gas_transmittance.nc” is missing for OCSSW

MSI does not work with the "R" tags or any "T" tag > T2022.13
I would suggest you use the standard tag for MSI (V2022.0)
We will look into updating the MSI processing.

don
by OB SeaDAS - dshea
Thu May 19, 2022 8:41 am America/New_York
Forum: Questions/Comments
Question: Seadas T2022.2 modis_atteph and getanc issues
Replies: 1

Re: Seadas T2022.2 modis_atteph and getanc issues

The SST file has a variable with the ice data in it. For the VIIRS J2 file in your example, notice the variable named "ice" from the dump of the NetCDF file: dshea@gs616-skeletonema anc % getanc V2021182021200.L1A_JPSS1.nc icefile=/Users/dshea/ocssw/var/anc/2021/182/N2021182_SST_OIV2AV_24h...
by OB SeaDAS - dshea
Thu May 05, 2022 11:50 am America/New_York
Forum: Questions/Comments
Question: Reducing processing time required to produce l2gen formatted metadata
Replies: 2

Re: Reducing processing time required to produce l2gen formatted metadata

MSI files take a long time to read into l2gen. Since we do not really support MSI data, we just whipped up a less than optimal reader. If you want the scan line data for each line, all the data will be read and it takes a long time. If you do not need the data for each line and just the global attri...