Correcting Martian spectra for illumination effects

Details Correcting Martian spectra for illumination effects Correcting Martian spectra for illumination effects

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001dps....33.3603l&link_type=abstract

American Astronomical Society, DPS Meeting #33, #36.03; Bulletin of the American Astronomical Society, Vol. 33, p.1102

Astronomy and Astrophysics

Astronomy

Scientific paper

With very few exceptions, a Martian rock sits under a Martian sky. The same simple fact is true of Martian soils. So, when spectra are used to investigate the composition of Martian rocks and soils, the sky illumination must be understood and compensated for. The Mars Pathfinder imaging experiment included ways to perform a simple but good illumination-correction for level targets. In addition, several sky measurements allowed a more detailed model of sky illumination to be created and applied to the correction of spectra. We use a radiative-transfer model of atmospheric scattering to derive sky illumination for arbitrary IMP images. The model works well in comparison with 12-color images of the radiative calibration targets on Pathfinder. We demonstrate the spectral effect of comparing a spectrum of a level target with one of a tilted target. We show that the commonly used target corrections work well for comparing images of level objects at varying times of day, but we will present limitations to the method. Since even soil surfaces at Ares Vallis are not precisely level, we investigate spectral uncertainties that result from small, arbitrary tilts. We illustrate a correction procedure that uses the illumination and topographic models to correct spectra. Application of the same procedure to orbital data is also illustrated, and can be done when there are known constraints on atmospheric dust opacity and scattering properties.

Affiliated with

Also associated with

No associations

Rating

Correcting Martian spectra for illumination effects does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Correcting Martian spectra for illumination effects, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Correcting Martian spectra for illumination effects will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1238280