>  Are there any applications that actively read in and use the CF grid mapping 
> parameters?

Not sure if I'm answering the right question here, but 
[Iris](https://github.com/SciTools/iris) ***definitely does*** explicitly 
interpret CF grid-mapping terms : we have explicit code for translating various 
types of grid-mapping to an [Iris 'coordinate_system']().  
Currently supporting types : 
```
albers_conical_equal_area
azimuthal_equidistant
lambert_azimuthal_equal_area
lambert_conformal_conic
lambert_cylindrical_equal_area
latitude_longitude
mercator
orthographic
polar_stereographic
rotated_latitude_longitude
stereographic
transverse_mercator
vertical_perspective
```
Most of these can also be produced as output.

For instance, we are currently working on making let Iris accept a 
geostationary grid with missing false_easting/false_northing parameters : 
https://github.com/SciTools/iris/pull/3628 

We currently don't support the WKT text, but could presumably consider this in 
future.

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