https://urldefense.us/v3/__http://cfconventions.org/cf-conventions/cf-conventions*grid-mappings-and-projections__;Iw!!G2kpM7uM-TzIFchu!nLZaMs2Ec9r7poYwgUmayT92X2uHr3RYsFwttRMz7oAXtlPQgoE8Oe5pNsSOd449zcMR3N_LFNo$
> A grid mapping variable may be referenced by a data variable in order to
> explicitly declare the coordinate reference system (CRS) used for the
> horizontal spatial coordinate values.
If you have a dimensionless variable `spatial_ref` for your `grid_mapping`
variable.
```
int64 spatial_ref ;
spatial_ref:crs_wkt = "GEOGCRS
...
```
Example #1: Valid variable referencing grid mapping variable
```
double green(time, y, x) ;
...
green:grid_mapping = "spatial_ref" ;
```
Example #2: Variable referencing grid mapping variable with it also listed in
the coordinate attribute:
```
double green(time, y, x) ;
...
green:coordinates = "spatial_ref" ;
green:grid_mapping = "spatial_ref" ;
```
If it is not valid, why is it not valid?
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