This stereo view was taken by the panoramic camera on NASA's Mars Exploration Rover Spirit on the rover's 87th martian day, or sol (April 1, 2004), just after Spirit left "Bonneville Crater." It shows the terrain to be covered in the trek towards the "Columbia Hills" in the background. Barely visible to the right of the hills is the outline of the distant rim of Gusev Crater.
This image is a stereo anaglyph in cylindrical-perspective projection. It combines images from the left and right eyes of the panoramic camera, taken through blue filters on both sides.
Figure 1 is the left-eye view of a stereo pair and Figure 2 is the right-eye view of a stereo pair.