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Test roated lat-lon projection with cfgrib and pyproj modules #320

Closed JeffHamiltonNOAA closed 4 months ago

JeffHamiltonNOAA commented 7 months ago

The rotated lat-lon projection is a bear to work with and in order to ingest the full NA RRFS A domain, we will need to properly handle the projection and grid transformations involving it. Experiment with the RRFS A files to determine if the projection is recognized properly and grid interpolations are handled properly to earth relative coordinates

JeffHamiltonNOAA commented 6 months ago

I've successfully tested cfgrib/xarray with RRFS A NA 3km grib2 files and found that the projString key is not present (or not immediately recognized by eccodes). This is what we use for operational HRRR/RAP, and I've tested that is still valid/true on my end as well, so now I'm looking for another attribute in the file that eccodes recognizes

JeffHamiltonNOAA commented 4 months ago

After finding no attribute in the file that could inform cfgrib about the projection of the model, this issue is no longer relevant. Another issue will be opened to work with Jebb and his group on additions to the eccodes library and cfgrib module to handle RRFS A