Image 3

Example of a single HRSC high-altitude image (HRSC orbit number 21,688_0000; Background MOLA shaded relief). Left: Red-green-blue-composite showing how the surface looks like in visible light. Note the light-blue colours of the northern and southern limb owing to a shallower view of the camera through the Martian atmosphere resulting in a stronger atmospheric influence of the images. Such image parts were excluded from the global mosaic. Right: Infrared-red-green-composite. Such unusual views including the infrared channel are one possible way to examine the relationship of the surface reflectivity in the infrared to that of other colours and have also been inspected to detect artefacts or holes in the input data. 

Download single HRSC high-altitude image