Can grid_mapping be different between data variable and geometry container? #89
Description
Suppose I have a data variable with lat and lon coordinate variables, and also a geometry attribute pointing to a geometry container. My geometries are watershed boundaries and their node coordinates are with respect to a projected coordinate system. Chapter 7 in CF 1.8 says, "The grid_mapping and coordinates attributes can be carried by the geometry container variable provided they are also carried by the data variables associated with the container." That says something about the presence of the attributes but not whether their values have to be the same. Am I allowed to have a grid_mapping attribute on my geometry container that names a different variable than the grid_mapping attribute on the data variable? As in:
geometry_container:grid_mapping = "projected_coordinate_system_variable"
data_variable:grid_mapping = "geographic_coordinate_system_variable"
This was posted to the CF-metadata list on 2019-02-01. No response as of 2019-02-19.