tanbul 2004 
NE 
SE 
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Valles 
(Figures 7 
parallel to 
the Grand 
st to West 
'sses main 
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-474 
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6,925 
-5,749 
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3 
0 
  
arineris 
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is vertical 
nt with the 
' from the 
| processes 
he process 
tain fronts 
should be responsible for controlling the development of the 
landscape in Valles Marineris. 
3. CONCLUSION AND PROSPECTS 
The geomorphometric comparison indicates that the terrain of 
Valles Marineris is not us steep us Grand Canyon but indicates 
higher relief variability. The rectilinear mountain fronts are a 
key indicator of the tectonic forces that shape the terrain of 
Valles Marineris chasma. The terrain of Grand Canyon is 
developed parallel to fluvial process direction while in Valles 
Marineris the terrain flows vertically to the mountain fronts. 
Thus, the key factor controlling the development of the 
landscape in Grand Canyon is fluvial process versus tectonism 
in Valles Marineris. Valles Marineris is less massive than 
Grand Canyon but this is due to the much greater elevation 
range observed (12 km versus 2.5 km). 
Geomorphometric mapping is the key that can extract, 
represent, segment and map extra-terrestrial and terrestrial 
features from moderate resolution digital elevation models. 
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