[Gdal-dev] Recommendations for vertical data in GDAL

[Ray Gardener]

Antoine Hue wrote:

 > Without being an expert in this field, I have run into some of these 
issues while working on 3D terrain modeling from DEM. I fully support an 
initiative to make it more explicit that a layer is a DEM, what is the 
unit and pixel interpretation.
 >
 > An extension to this is support for geocentric SRS and warp to/from 
geocentric SRS.

I think that could be satisifed by
a) having ORGSpatialRef parse GEOCCS nodes (if it doesn't already),
b) adding an IsGeocentric() method,
c) adding a SetGeocentricCS() method,
b) doing any necessary mods to OGRCoordTransform to use such data when 
one or both of its spatialrefs are geocentric, and
c) formalizing the list of avail. geocentric datums.

Ray