[Proj] geoid-ellipsoid height conversion

Oscar van Vlijmen ovv at hetnet.nl
Thu Feb 16 11:16:11 EST 2006

> Proj doesn't do height conversions between geoid and ellipsoid
> references. For that you should use a geopotential model, such as
> EGM-96. You can use the link:
> http://sps.unavco.org/geoid/
> to estimate the geoid height for a given point.

or the official (?) one at:

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