NASA gives this stuff out
MOLA data is from laser altimetry experiments and so should be intrinsically
shadow free.
if you really want raw data
http://ltpwww.gsfc.nasa.gov/tharsis/data.html
or
http://www.solarviews.com/raw/mgs/mgstopo3.jpg
and more at
http://solarviews.com/cap/index/maps-topographic1.html
DLM
