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The URL in the post you found was moved with the reorganized website. It now lives here:https://oceancolor.gsfc.nasa.gov/resources/docs/format/l3bins/ The sample code on that page will show you how to get the geolocation for a given bin, however, it doesn't show how to retrieve the geophysical value...

Just a comment on l3mapgen - while it has a set of default projections it supports, it also accepts user defined projections...if it's available in Proj, it's (very likely) available in l3mapgen

Regards,
Sean

Peter,

The page didn't move far: https://oceancolor.gsfc.nasa.gov/resources/docs/distfromcoast/
It was never really easy to find, but I agree it is now less so. We'll see what we can do to bubble it up a bit.

Sean

The l2gen scan line attributes variable csolz is not the same as the l1rec->csol_z variable. The former is the solar zenith angle for the center of the scan line, the later (required by the algorithm) is the cosine of the solar zenith angle at each pixel. It is not a product that l2gen can output, a...

0700 UTC for the Chesapeake Bay is at night....so the granule doesn't have valid reflective solar band data and the HKM and QKM files (which only have reflective solar bands) are not output.

Sean

Tom,
I used the tools we make available with the SeaDAS package to generate those images of the L3 mapped Kd490 data, specifically the l3mapgen program.
Regards,
Sean

Tom, The site you reference is a NOAA site, not NASA. The site does indicate that the MODIS data they present comes from NASA, however the VIIRS data is from NOAA. That said, I looked at the corresponding NASA product, and overall, the Aqua MODIS and SNPP VIIRS Kd490 products agree quite well. Certa...

Yes, indeed that file has double vision. ...not sure how it managed to repeat itself, but we'll dig into it and see if we can resolve the issue.

Sean

Yes, the EFR data are available (as of this writing, through 16 July 2023).
Select the EFR checkbox for the desired sensor, select the TC option and click the 'Reconfigure page' button and you should see the available data.

Sean

You can also select the TC (true color) images, and the current browser will display the available OLCI data.

Sean