[Gdal-dev] Recommendations for vertical data in GDAL

[Frank Warmerdam]

Antoine Hue wrote:
> Our terrain modeling is based on the excellent Open Scene Graph 
> osgTerrain library which is using GDAL for data access and warp. When 
> the SRS is geographic, there is a further step to transform coordinates 
> in geocentric using an approximate model of the ellipsoid.
> When you say PROJ.4 supports geocentric coordinate systems, does it mean 
> it could handle the geographic <-> geocentric conversions?

Antoine,

Yes, once the changes in OGR noted by Ray are made, it should be possible
to use PROJ.4 (through OGR) to transform coordinates to geocentric
coordinates.

Best regards,
-- 
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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
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and watch the world go round - Rush    | President OSGF, http://osgeo.org