Basaltic Crater in Color IR

Scaled Image

Image Credit: NASA/JPL/ASU

About this image

This image shows two representations of the same infrared image near Nili Fosse in the the Isidis region of Mars. On the left is a grayscale image showing surface temperature, and on the right is a false-color composite made from 3 individual THEMIS bands. The false-color image is colorized using a technique called decorrelation stretch (DCS), which emphasizes the spectral differences between the bands to highlight compositional variations.
In many cases craters trap sand in their topographic depressions, interrupting the sand's migration across the Martian surface. This image is particularly interesting because there appears to be more than 1 type of sand in the bottom of this crater and in the hummocky terrain near the bottom of the image. The pink/magenta areas are characteristic of a basaltic composition, but there are also orange areas that are likely caused by the presence of andesite. These two compositions, basalt and andesite, are some of the most common found on Mars.

Please see the THEMIS Data Citation Note for details on crediting THEMIS images. 


Image ID: 
I01570009 (View data in Mars Image Explorer)
2002-04-22 13:45
Fri, 2004-08-06
320 pixels (32 km)
1156 pixels (115 km)
0.099876 km/pixel
0.102142 km/pixel


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