I plan to follow the pattern in the publication that @mjbrodzik linked and include srid and proj4text attributes to augment the CF attributes and crs_wkt, along with an esri_pe_string (more on that below) to maximize likelihood that end users will be able to interpret the coordinate system. The outdated WKT format is related to WKT and not CF so that would be up to the data producer (my team in this case) to figure out rather than the CF team, though I would happily entertain a WKT guru reading this who wants to offer up the solution. So as long as nothing looks broken in the CF attributes, then I think this issue can be closed.
Note: I was testing by adding the netCDF file to ArcMap 10.6, and the grid cells were not aligning with known point data, which is what prompted me to open this issue. Upon closer inspection, it appears ArcMap is ignoring the inverse_flattening attribute, and assuming the WGS84 datum instead of using the authalic sphere. So I think it's ArcMap that is incorrect and not the netCDF file. I found that by including an esri_pe_string attribute on the data variable that is basically the WKT, the software would read that instead of the CF stuff and project the data correctly. ``` fake_var:esri_pe_string = "PROJCS[\"NSIDC_EASE_Grid_North\",GEOGCS[\"GCS_Sphere_International_1924_Authalic\",DATUM[\"D_Sphere_International_1924_Authalic\",SPHEROID[\"Sphere_International_1924_Authalic\",6371228.0,0.0]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Lambert_Azimuthal_Equal_Area\"],PARAMETER[\"False_Easting\",0.0],PARAMETER[\"False_Northing\",0.0],PARAMETER[\"Central_Meridian\",0.0],PARAMETER[\"Latitude_Of_Origin\",90.0],UNIT[\"Meter\",1.0]]"; ``` -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/cf-convention/cf-conventions/issues/278#issuecomment-645049727 This list forwards relevant notifications from Github. It is distinct from [email protected], although if you do nothing, a subscription to the UCAR list will result in a subscription to this list. To unsubscribe from this list only, send a message to [email protected].
