3 | 3 | > As I read the definition and usage of formula_terms, I find that it is '''entirely and only''' a description of how to combine the values of a unitless coordinate variable with values from other variables to produce coordinate values that have units. It is possible that this "resultant coordinate" could be georeferenced, but that is something else. It is true that it is meaningless to associate a CRS with a unitless coordinate variable if you don't provide a description of how to get to values that can be georeferenced, but this doesn't mean that a mathematical transform equates on any level with a declaration of a CRS. |