THEMIS Image of the Day, March 5, 2019. This false-color image is located between Terra Sabaea and Isidis Planitia basin.
Blue tones in this band configuration indicate basaltic sands. The sands are more prevalent in the plains at the upper frame part of the image, and only occur in limited number of depressions in the bottom half of the image. The underlying reason for the difference may related to sand abundance or sand mobility by the wind.
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.