Status Report

NASA Mars Odyssey THEMIS Image: DCS Color near Mare Cimmerium

By SpaceRef Editor
July 29, 2004
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Medium image for 20040728A

Image Context:

Context image for 20040728A
Context image credit: NASA/Mars Orbiter Laser Altimeter (MOLA) Team
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ParameterValue ParameterValue
Latitude-23.7 &nbsp InstrumentIR
Longitude139.3E (220.7W) &nbsp Resolution (m)100
Image Size (pixels)2668×320 &nbsp Image Size (km)266.8×32

This image is part of the following themes:

Full data on this image has now been released via the THEMIS Data Releases website.

This image shows two representations of the same infra-red image covering

an area near Mare Cimmerium. On the left is a grayscale image showing

surface temperature, and on the right is a false-color composite made

from 3 individual THEMIS bands. The false-color image is colorized

using a technique called decorrelation stretch (DCS), which emphasizes

the spectral differences between the bands to highlight compositional


This area contains a mixture of basaltic materials (magenta/purple) and dust (green/blue). Faint blue areas may be due to some thin water ice clouds. The different compositional units are sometimes correlated with crater floors and other surface features, but they are often not tied to valleys, lava flows, etc… indicating that the surface materials could be mobile (dust and sand).

[Source: ASU THEMIS Science Team]

Note: this THEMIS infrared image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.

NASA’s Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA’s Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.

Image Credit: NASA/JPL/Arizona State University

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