Thermal Emission Imaging System - Infrared Band (THEMIS IR)
THEMIS IR images were chosen because they provided planet-wide coverage of Mars at a resolution (100 m/pixel) capable of revealing many dune features. Due to small particle size, dunes have a lower thermal inertia than surrounding rock, accompanied by a large diurnal temperature change. The dunes are relatively warm in the daytime images, appearing light in tone, making them easy to detect. In nighttime images the pattern reverses with the relatively cool dunes appearing dark.
More information on THEMIS IR and Vis can be found at themis.asu.edu.
Thermal Emission Imaging System - Visible Band (THEMIS Vis)
The higher resolution THEMIS VIS images are used, when available, to verify that the features are dunes and to classify the dune types.
More information on THEMIS Vis and IR can be found at themis.asu.edu.
Mars Orbital Camera (MOC)
Because of the higher spacial resolution, MOC images are used to identify and analyize slip faces and dune types.
More information on MOC and Malin Space Science Systems can be found at www.msss.com.
High Resolution Imaging Science Experiment (HiRISE)
Though HiRISE images have not yet been used on the MGD3, these images shoudl offer even higher resolution that will better identify dune types, and should be able to show improved detail within the dunes.
More information on HiRISE can be found at hirise.lpl.arizona.edu.
Compact Reconnaissance Imaging Spectrometer for Mars (CRISM)
CRISM images, like HiRISE, have not yet been used for the MGD3. Also like HiRISE though, CRISM will offer greater detail and a better understanding of the dunes on Mars.
More information on CRISM can be found at crism.jhuapl.edu.