Search found 260 matches

by OB SeaDAS - dshea
Mon Oct 24, 2022 10:25 am America/New_York
Forum: Home
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: Home
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: Home
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: Home
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: Home
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: Home
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...
by OB SeaDAS - dshea
Thu May 05, 2022 11:35 am America/New_York
Forum: Home
Question: Failed to compile OCSSW on Debian 11
Replies: 2

Re: Failed to compile OCSSW on Debian 11

The directions to compile the source code are here:

https://seadas.gsfc.nasa.gov/build_ocssw/

It looks like you never built the $OCSSWROOT/opt/src which is step 6.

don
by OB SeaDAS - dshea
Thu May 05, 2022 11:23 am America/New_York
Forum: Home
Question: l2gen Try doing atomsphreic correction
Replies: 4

Re: l2gen Try doing atomsphreic correction

This error will happen if you have older binaries and newer ocssw/share data files. The avw_coef parameter is a newish param. I am pretty sure this error will not happen if the binaries and share tree are from the same tag.

don
by OB SeaDAS - dshea
Tue Apr 26, 2022 2:14 pm America/New_York
Forum: Home
Question: Seadas T2022.2 modis_atteph and getanc issues
Replies: 12

Re: Seadas T2022.2 modis_atteph and getanc issues

if you look at the SST file you will notice that there is an ice variable in it, so it has the ice fraction data. For example: dshea@gs616-skeletonema ~ % ncdump -h /Users/dshea/ocssw/var/anc/2018/023/N2018023_SST_OIV2AV_24h.nc netcdf N2018023_SST_OIV2AV_24h { dimensions: time = UNLIMITED ; // (1 cu...
by OB SeaDAS - dshea
Mon Apr 25, 2022 11:22 am America/New_York
Forum: Home
Question: l2gen Try doing atomsphreic correction
Replies: 4

Re: l2gen Try doing atomsphreic correction

What OS are you using, how did you install l2gen and could you post the actual command line you are trying to execute.

don