> Hi(gh)!
>
> The problem: I want to project a square image_map, which is a
> heightfield covering one square degree of ASTER elevation data, onto a
> sphere, not onto the entire sphere, but instead onto the geographic
> coordinate range defined by the elevation data tile.
>


> shall have the texture, all other parts of the sphere shall remain
> textureless.

applying spherical warp to a scaled-down version of the image map (with 
the "once" keyword) might do the trick.

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