Search found 1162 matches

by OB.DAAC - SeanBailey
Tue Jun 08, 2021 9:36 am America/New_York
Forum: All Questions/Comments
Question: MODIS geographic coordinate system
Replies: 3

Re: MODIS geographic coordinate system

Zach, While the Level-2 product includes a lat/lon for each pixel, it is not mapped. Looks like R is assuming a regular grid based on the geographic extents of the file. The data are very much NOT on a regular grid. Perhaps for your R processing you'll want to map the data prior to reading them (or ...
by OB.DAAC - SeanBailey
Tue Jun 08, 2021 9:06 am America/New_York
Forum: All Questions/Comments
Question: Chlorophyll_a data retrieval
Replies: 4

Re: Chlorophyll_a data retrieval

Well, xarray is great for multi-dimensional array data, not so keen on the single dimensional compound data structure of the bin files. It can be read with Python and the netCDF4 module, but xarray probably can't interpret it out of the box. Here's what's contained in a typical bin file: group: leve...
by OB.DAAC - SeanBailey
Tue Jun 08, 2021 8:47 am America/New_York
Forum: All Questions/Comments
Question: seadas ocssw
Replies: 4

Re: seadas ocssw

Make sure your system has (and SeaDAS uses) at least the minimum requirements listed here:
https://seadas.gsfc.nasa.gov/requirements/

Python 3.5 is less than the minimum required 3.6, so I suspect your requests module is also too old.

Sean
by OB.DAAC - SeanBailey
Mon Jun 07, 2021 10:46 am America/New_York
Forum: All Questions/Comments
Question: seadas ocssw
Replies: 4

Re: seadas ocssw

The SeaDAS processing scripts were intended for a single user system. The issue you are running into is due to the fact that there is a local sqlite database that is created when the ancillary files are queried and that file has permissions set for a different user. The scripts do allow for user-spe...
by OB.DAAC - SeanBailey
Mon Jun 07, 2021 10:24 am America/New_York
Forum: All Questions/Comments
Question: What is the definition of the HISATZEN MODIS flag?
Replies: 2

Re: What is the definition of the HISATZEN MODIS flag?

The HISATZEN Level-2 flag is set when the sensor zenith angle is greater than or equal to 60 degrees. It is controlled by the l2gen input parameter satzen . No, the sensor zenith angle is not included in the L2 files. It is in the geolocation file that was used in the L2 processing. For MODIS, we ge...
by OB.DAAC - SeanBailey
Mon Jun 07, 2021 10:13 am America/New_York
Forum: All Questions/Comments
Question: Chlorophyll_a data retrieval
Replies: 4

Re: Chlorophyll_a data retrieval

Glad you figured it out :D Just so you are aware, the bin files are not in a raster format. They can be read with Python, but a little bit of extra work is necessary to get to a recognizable image. There is an old, but still mostly relevant document on the binning process and format: https://oceanco...
by OB.DAAC - SeanBailey
Tue Jun 01, 2021 3:36 pm America/New_York
Forum: All Questions/Comments
Question: L2gen error with 3x3 straylight masking
Replies: 4

Re: L2gen error with 3x3 straylight masking

Ah, worked for me because I used a more recent version of the code. It should work for you as well if you update OCSSW to the latest released with SeaDAS8. With the version you're running, it should never work for you with those parameters in the filter file. It's not the source L1 that is the issue...
by OB.DAAC - SeanBailey
Tue Jun 01, 2021 2:12 pm America/New_York
Forum: All Questions/Comments
Question: L2gen error with 3x3 straylight masking
Replies: 4

Re: L2gen error with 3x3 straylight masking

Andrea, The code probably isn't trying to be lazy... can you verify that the GEO filename is correct? I ask because that A2007180190000.L1A_LAC produced a GEO file like this "A2007180190001.GEO" when I ran it through modis_GEO. So, l2gen failed because my assumption that the GEO file would...
by OB.DAAC - SeanBailey
Tue Jun 01, 2021 10:44 am America/New_York
Forum: All Questions/Comments
Question: OLCI Vicarious Calibration Coefficients
Replies: 10

Re: OLCI Vicarious Calibration Coefficients

Here is a set of preliminary gains to try with OLCI-S3B:

gain=[0.98928,0.988936,0.98734,0.97931,0.98508,0.98556,0.98588,0.98491,0.98252,0.98506,1.01325,0.9897,1.0,1.0,1.08547,0.99640,1.0,1.0161,1.0,1.0,1.0]

Regards,
Sean
by OB.DAAC - SeanBailey
Tue Jun 01, 2021 10:16 am America/New_York
Forum: All Questions/Comments
Question: Blosc compression data
Replies: 3

Re: Blosc compression data

Sorry, we have never seen these products nor have we any experience with BLOSC compression. You may need to inquire with the product creator for help reading these files.

Sean