- Press Release
- Nov 30, 2022
NASA Mars Odyssey THEMIS Image: Canyon in DCS Color
Context image credit: NASA/Mars Orbiter Laser Altimeter (MOLA) Team
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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 a portion of Ganges Chasma. 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 variations.
The northern canyon at the top of this image is dominated by a bright
red/magenta area consisting primarly basaltic materials on the floor of
the canyon and atmospheric dust. Within that area, there are patches
of purple, on the walls and in the landslides, that may be due to an
olivine rich mineral layer. In the middle of the image, the green on the mesa
between the two canyons is from a layer of dust. The patchy blue areas in the southern canyon are likely due to water ice clouds.
[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.
Image Credit: NASA/JPL/Arizona State University
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