Forum

l2gen derives the IRS filename from the input VNR file (it's a simple string substitution), so there is no parameter for passing the IRS filename. Sure, not ideal, as filename can lie (well, not match the expected pattern). In your run, l2gen is complaining that "GC1SG1_202205260207P05515_1BSN_...

The file not found is: /home/naarring/SeaDAS/ocssw/share/common/tai-utc.dat You need to make sure to have run update_luts: $ update_luts viirsn Oh, and it *should* be /home/naarring/SeaDAS/ocssw/var/common/tai-utc.dat ("var", not "share") seems your $OCDATAROOT is being used as $...

Mike,

To get floating point values in the TIFF output from l3mapgen, set 'apply_pal=no' (or false, or 0).

Sean

Elaine, The documentation on the "ProcessGeolocate_viirs" page needs to be updated (thanks for alerting us to that discrepancy). The required DEM files are no longer distributed using the samoa FTP server (it, in fact, no longer serves as an FTP server - as we no longer support FTP distrib...

The l2gen flag CLDICE is set for a pixel when the cloud albedo (defined as the rayleigh corrected TOA refectance in a specified NIR or SWIR band - varies by sensor) is above a threshold (default is 0.027 for the band closest to 865nm). It's the cloud/ice flag because both clouds and ice can trigger ...

Jacques, It doesn't' need modifying (or dealing with on your end). The paths are resolvable (otherwise the html links wouldn't work). Sure that extra "./" seems odd (and is superfluous), but the link works the same as if it wasn't there. The directdataaccess URL is primarily intended for h...

The NDVI product is computed from Rayleigh corrected reflectance. Over land, l2gen computes the Rayleigh contribution following the work of Jacques Descloitres (briefly described in Gumley, Descloitres, and Schmaltz. 2003. "Creating reprojected true color MODIS images: A tutorial." Univers...

No, there is no tool that can read the L0 files (at least none that I am aware). The L0 files are just a the raw binary packet stream from the instrument, which as I said before is not a particularly friendly format. All of the information from the L0 is contained in the L1A file, but organized in a...

The L0 format isn't really a friendly one. We distribute them for those who wish to concatenate several together to generate L1 files that are not in the 5-minute granularization that we distribute. Our SeaDAS package includes scripts and programs necessary to convert the L0 binary data into the mor...

Jacques,

Correct, both URLs are still active, although the older one is deprecated. We will likely discontinue support for the older path on June 1st (but haven't set that in stone yet). Just know it WILL go away and relatively soon.

Regards,
Sean