[Proj] Fw: Re: GeographicLib geoid calculations

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J Luis [jmfluis at gmail.com] kirjoitti: 
> > The geoid might be an interesting academic study but the ellipsoid is
> > a much more stable zero reference and since the earth is not stable
> > by its nature (plate dynamics) it is obvious that the geoid will never
> > be fully fixed in time.
> 
> Academic?

sorry, I really meant "Alchemy" ;)

> The water flows down the geoid, NOT the ellipsoid.
> Te ellipsoid is not fixed in time either, if not for isostasy an land
> masses erosion,  sea level changes.
> 

something like that...

Janne.

> Joaquim