More insight on Google Mars...

Given below is an Excerpt from "Mars Odyssey Mission THEMIS: Projects: Google Mars"

In 1895, Percival Lowell published his map of Mars. He spent many years of his life exploring Mars through his telescope. Now you can explore Mars too, through your browser. Google Mars is the result of collaborations between Google and us. With it, you can explore some of the most detailed scientific maps of Mars ever made.

At the heart of Google Mars is a gigantic mosaic image of Mars. Using over 17,000 individual infrared photos, we assembled the mosaic at a scale that resolves features as small as 230 meters (750 feet) across. The images come from THEMIS, the Thermal Emission Imaging System, a camera that takes photos in 5 visible and 10 infrared bands. It is or
biting Mars aboard NASA's Mars Odyssey.