CRISM's global mapping of Mars, Part 2

This is the second version of tile 750, in which a still-experimental correction for illumination and atmospheric effects has been applied. It shows a part of Mars called Tyrrhena Terra in the ancient, heavily cratered highlands.

The colored strips are CRISM multispectral survey data acquired over several months, in which each pixel has a calibrated 72-color spectrum of Mars. A mathematical model of the effects of seasonal variations Mars' atmosphere has been used to correct brightness to how it would appear if each strip was imaged with the same illumination and without an atmosphere.
The three wavelengths shown are 2.53, 1.50, and 1.08 micrometers in the red, green, and blue image planes respectively. Compared to data without corrections, strip-to-strip brightness differences have largely been eliminated. The residual bluish color of some areas is due to clouds that were not included in the mathematical model. The gray areas between the strips are from an earlier mosaic of the planet taken by the Thermal Emission Imaging System (THEMIS) instrument on Mars Odyssey, and are included only for context. Ultimately the multispectral survey will cover nearly all of this area.'

Source: Johns Hopkins University Applied Physics Laboratory
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