- Press Release
- Dec 5, 2022
NASA Mars Odyssey THEMIS Image: DCS in Hesperia Planum
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 in Hesperia Planum, west of Herschel Crater. 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
The two primary compositions that cover most of Mars – dust and basalt (probably in the form of sand) – are well represented in this image. In this image, the dust is green in color and the basalt is pink/magenta. The strongest basaltic signatures appear in the bottoms of craters, which act as topographic traps for the sand. Green dust streaks appear behind many of the smaller craters. The topographic relief of the crater prevents the wind from cleansing the dust from the surface. These features enable the determination of the prevailing wind direction in the region.
[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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