I tried the same technique i used for the earth some time ago, see:

Subject: rendering the earth (71k+68k)
Date: Tue, 01 Apr 2003 22:57:55 +0200
From: Christoph Hormann <chr### [at] gmxde>
Newsgroups: povray.binaries.images

for rendering the Mars surface.  The topography data is from:

http://wufs.wustl.edu/missions/mgs/mola/megdr.html

and the coloring uses a much lower resolution image.

The first image shows the whole planet, rendered in various tiles like
before.  The second image shows a closeup view of Valles Marineris.

Christoph

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