Method name for setting a CRS

[benbovy]

Several options:

1. .proj.set_crs(...): like in Xvec and currently implemented
2. .proj.write_crs(...): like in rioxarray
3. .proj.assign_crs(...): like in odc-geo

I have a slight preference for option 3. This is more consistent with methods like Xarray assign_coords that also return new Dataset or DataArray objects with new or replaced coordinates.

[scottyhq]

I have a slight preference for option 3. This is more consistent with methods like Xarray assign_coords that also return new Dataset or DataArray objects with new or replaced coordinates.

I agree! Would be great to align as much as possible with existing Xarray methods and syntax

[benbovy]

I also wonder whether we should have a allow_override=False option or no option, i.e., in the latter case just leave the responsibility to the user that assign_crs(spatial_ref=crs) may overwrite any existing CRS.

odc-geo's assign_crs() docstrings says "Assign CRS for a non-georegistered array or dataset" but I don't see anything that prevent overwriting an existing CRS in the implementation.