[CF-metadata] Additional projections for CF

[Don Murray]

Phil/Ethan-

Philip Bentley wrote:

> An obvious one perhaps, but one which we may find increasingly useful /
> relevant in light of the rise and rise of GoogleEarth-type applications,
> is the Orthographic projection. This being the classic 'view from space'
> projection.
> 
> Same grid mapping parameters as the other azimuthal projections, viz.
> 
> grid_mapping_name = "orthographic"
> 
> longitude_of_projection_origin
> latitude_of_projection_origin
> false_easting
> false_northing
> 
> (though off the top of my head I can't think of a scenario where one
> would want to use the last two params).

I think GE actually uses a tilted perspective view.  But,
I think CF should support the Vertical Perspective with
an ellipsoid.  EUMETSAT has GRIB messages with this projection
and an elliptical earth.

Don
*************************************************************
Don Murray                               UCAR Unidata Program
dmurray at unidata.ucar.edu                        P.O. Box 3000
(303) 497-8628                              Boulder, CO 80307
http://www.unidata.ucar.edu/staff/donm
*************************************************************