PolarStereographicGridDefinition.EnumerateGridPoints Not Implemented Exception - when reader.GetDatasetValues is called about ngrib

[nmangue]

The way you read the data is ok. However there are many ways to encode data values in a grib file. It seems that the template used by your dataset is not yet supported

Could you provide the full stack trace and the value of DataSet.DataRepresentationSection.TemplateNumber ?
If possible, could you also share the file you are reading ?

[AquaNerd]

@nmangue thanks for getting back to me so quickly. Here is where I am pulling the grib2 files from. https://nomads.ncep.noaa.gov/pub/data/nccf/com/pcpanl/prod/

An example file out of those are https://nomads.ncep.noaa.gov/pub/data/nccf/com/pcpanl/prod/pcpanl.20220211/st4_conus.2022021114.01h.grb2

[AquaNerd]

@nmangue I am finding out that the original not implemented exception is due to the contents of the file include using the polarStereographicGridDefinition template which here is not yet implemented.

NGrib/src/NGrib/Grib2/Templates/GridDefinitions/0020_PolarStereographicProjectionGridDefinition.cs

Line 83 in cf1e780

public override IEnumerable<Coordinate> EnumerateGridPoints() => throw new NotImplementedException();

I assume that was put there as a placeholder for the point when you ran into a need to implement it. As in, you didn't have example data to use in order to set it up. Correct?

[nmangue]

That is correct !
Would you try to implement this functionality ? You can use the NetCDF Java implementation as a reference : Grib2Gds.java@983

[AquaNerd]

@nmangue in due time. But for my use case, I am limited on time. I guess I will keep an eye out if you or someone else beats me to it.

That is correct ! Would you try to implement this functionality ? You can use the NetCDF Java implementation as a reference : Grib2Gds.java@983

Also there is a bit more to it then just copy pasting into c# code. I have not dug into it far enough to determine what is comparable to the projection interface and AbstractProjection base class that is used for the stereographic projection.