I have some grib files from ECMWF ERA-Interim Reanalysis in which all the data are projected onto the N128 Gaussian grid (256 points of latitude x 512 points of longitude, https://www.ecmwf.int/en/forecasts/documentation-and-support/gaussian_n128).
I need to compare these data with some that have been geo-located with a GPS and are therefore in WGS84 latitude and longitude.
How should I do?
Is there a reprojection to do?
If so, which one?
I am googling like crazy but I can't find any clear explanation.