THEMIS Image of the Day, February 27, 2019. This VIS image shows the floor of an unnamed crater in Arabia Terra. The peaks in the center of the crater floor were formed by the rebound of melted rock at the time of the impact.
There are individual sand dunes in the southern half of the crater. The dark blue tone in this filter combination indicates that the dunes are made of basaltic sand.
The THEMIS VIS camera contains 5 filters. The data from different filters can be combined in multiple ways to create a false color image. These false color images may reveal subtle variations of the surface not easily identified in a single band image.