=?UTF-8?Q?J=c3=b6rg_=22Yadgar=22_Bleimann?= <yaz### [at] gmxde> wrote:
> Hi(gh)!
>
> On 14.04.20 09:51, jr wrote:
>
> > agree with this.  ~70% of the surface is ocean, so a lo-res representation of
> > that alone would lead to significant savings.
>
> But how to do this - as the reliefs are not "flat", but follow Earth's
> curvature?
>
> See you in Khyberspace!
>
> Yadgar

http://www.econym.demon.co.uk/isotut/combine.htm
See:  "Addition and Subtraction"

You have latitude, longitude, and elevation.
Just modulate the elevation (radius)

A common way to approximate spheres is triangle subdivision, bumping the new
central vertex "out" to the radius.
http://news.povray.org/povray.binaries.images/thread/%3C57b60bd1$1@news.povray.org%3E/

So you'd just construct a base with a spherical curve (oblate spheroid geodesic)
and then add the height to the base.   "easy".  ;)

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