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CF standard: add a dummy variable crs and add all grid mapping related meta-data as attributes.
proposed extension: make sure that the dummy variable crs it an integer and that its value is the EPSG code of the coordinate system, e.g:
- 28992 for Dutch Rijksdriehoek (projection_x_coordinate,projection_y_coordinate)
- 4326 for WGS84 global ellipsoid (latitude, longitude)
- 32631 for WGS 84 / UTM zone 31N (projection_x_coordinate,projection_y_coordinate)
proposed extension: add a WKT (well-known text) string of all grid mapping related meta-data (the WKT quite laborious for parsing though).