Optical Depth Retrievals from Shadows in HiRISE Images

Details Optical Depth Retrievals from Shadows in HiRISE Images Optical Depth Retrievals from Shadows in HiRISE Images

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.2403h&link_type=abstract

American Astronomical Society, DPS meeting #39, #24.03; Bulletin of the American Astronomical Society, Vol. 39, p.454

Astronomy and Astrophysics

Astronomy

Scientific paper

The spatial resolution of the images that the HiRISE camera is taking of the Martian surface is unprecedented and offers new ways to estimate the optical depth of the aerosols abundant in the Martian atmosphere. While resolved shadows are rare in images of Mars at spatial resolutions of tens or more meters per pixel, HiRISE's images actually often resolve the much more common smaller shadows that are cast by boulders and cliffs in the rims of craters. We used a HiRISE image of the Opportunity rover site to estimate optical depths from shadows and compared our estimates with the ground truth that the rover measured by looking at the sun. Our results suggest that retrievals of the optical depth from shadows can yield an accuracy of better than 10%.

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