In-flight geometrical calibration of OMEGA detectors and implication for mapping

Details In-flight geometrical calibration of OMEGA detectors and implication for mapping In-flight geometrical calibration of OMEGA detectors and implication for mapping

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1081m&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1081

Computer Science

Scientific paper

Since orbit insertion in January 2004, the OMEGA experiment on board the Mars Express spacecraft, is mapping the surface composition of Mars at a 0.3- to 5-kilometre resolution by means of visible-nearinfrared (IR) hyperspectral reflectance imagery operating from 0.35 to 5.1 μm. The OMEGA data sets, archived in the ESA's Planetary Science Archive, currently contain uncalibrated observational data along with calibration routines, and geometry data associated to each observation. Geometry data provide key information for the mapping and photometric analysis of the observational data, and for cross-instrument data analysis. Although these data are very useful to obtain a first estimate of the regions mapped by OMEGA observations, the remaining registration errors ( 2.5 pixels) prevent the controlled production of composite maps without degrading spatial resolution. We will first present the approach currently used to reconstruct the geometry of observations, then we will introduce a new method being developed to refine the OMEGA detectors geometry model so as to achieve sub-pixel georeferencing accuracy. The detectors geometry model includes both interior and exterior orientation data.

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