Connecting VNP14IMG Swath Data with VNP03IMG Geolocation Data

[jiyeon-kim20]

Hello,

I am working with VIIRS satellite data and currently have two files:

1. VNP14IMG - Swath data without geolocation.
2. VNP03IMG - Geolocation data.

Each file uses a different reader:

viirs_l1b for VNP03IMG
viirs_edr_active_fires for VNP14IMG (for which I have already made a custom reader in the YAML file).

scn = Scene(filenames={
    'viirs_l1b': ['/content/VNP03IMG.A2023221.1124.002.2023221175939.nc'],
    'viirs_edr_active_fires': ['/content/VNP14IMG.A2023221.1124.002.2024080020549.nc']
                       })

Given these differences,
how can I connect or merge the geolocation data from VNP03IMG with the swath data from VNP14IMG?

Thank you!

[djhoese]

Thanks for filing this question. There are two paths to a solution, but I need more information about these files. Mainly, are these new official fires products from NASA? Are these imagery versions of the fire detection (isn't that a waste of space?)?

To get something working I would either edit the viirs_edr_active_fires as it sounds like you've already started or update the viirs_edr reader. If this is some kind of official EDR product it might be nice to update viirs_edr to handle it if the loading resembles/matches the existing files handled by that reader.

For the viirs_edr_active_fires case, I would copy the geolocation file type definition and lon/lat definitions from viirs_l1b and place them into viirs_edr_active_fires.yaml. Or make a whole new YAML file for a new reader if you run into issues. The viirs_edr_active_fires.yaml file would point to the python code for viirs l1b and for the viirs active fires. That's fine.

Bottom line: the "connecting" of these two file types happens via duplication in the reader YAML rather than anything fancy on the Scene-level.