A Large-Scale Atmospheric Equalization Technique for THEMIS Data

Details A Large-Scale Atmospheric Equalization Technique for THEMIS Data A Large-Scale Atmospheric Equalization Technique for THEMIS Data

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.p11a0961a&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #P11A-0961

Mathematics

Logic

5409 Atmospheres: Structure And Dynamics, 5410 Composition, 5464 Remote Sensing, 5494 Instruments And Techniques, 6225 Mars

Scientific paper

Spaceborne thermal infrared observations of Martian surface emissivity using the Mars Odyssey THEMIS instrument can offer a revealing look at the mineralogical makeup of the planet at unprecedented spatial resolution. In areas of high topographic relief, however, varying atmospheric path length makes it difficult to qualitatively or quantitatively compare spectra at different elevations. We describe a technique that normalizes the atmospheric signature across the image, minimizing the effects of path length. As expected, the amplitude of the required normalization is shown to vary seasonally, suggesting that atmospheric dust plays an important role in the extinction. A lack of this effect at 12.57μ m appears to exclude water vapor or ice crystals as a major component of the phenomenon.

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