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Re:Open Access at European Space Agency by Nocturnals on Tuesday February 21, 2017 @10:12AM (#13696053)
Have you looked at orbiter (http://orbit.medphys.ucl.ac.uk/)?

I know they have some high resolution maps for several planets .

Go to download->optional high-resolution texture download (http://orbit.medphys.ucl.ac.uk/mirrors/orbiter_radio/tex_mir...). I don't know the format so I could be mistaken but I think it also includes elevation maps.

Re:Open Access at European Space Agency by exDM69 on Tuesday February 21, 2017 @01:53PM (#13698296)
I know Orbiter and I have been using textures from Celestia add-ons.

They are typically normal rectangular textures with the usual distortion.

Thanks for the pointer.