Dear Eizi > Yes the default is the spherical latitude and longitude. But practically > we often compare locations in such datasets with locations in common > ellipsoidal CRS such as WGS84. If a default CRS is to be defined that > should be WGS84. I don't think anybody want automatic conversion of > latitudes from spherical to ellipsoidal - that means 20 km of shift in > midlatitudes.
Not all data is real-world data. In fact possibly the majority of CF data in archives (the CMIP data) is model data, for which a spherical model Earth is often correct, and that's why it's the default. If this is not appropriate, a grid_mapping should be included to specify the ellipsoid. Best wishes Jonathan _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
