The Topographic Mapping Performance of the HRSC (High Resolution Stereo Camera) on Mars Express

Details The Topographic Mapping Performance of the HRSC (High Resolution Stereo Camera) on Mars Express The Topographic Mapping Performance of the HRSC (High Resolution Stereo Camera) on Mars Express

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufm.g53c..03o&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #G53C-03

Physics

1221 Lunar And Planetary Geodesy And Gravity (5417, 5450, 5714, 5744, 6019, 6250), 5464 Remote Sensing, 5494 Instruments And Techniques

Scientific paper

The ESA (European Space Agency) spacecraft Mars Express was launched from Baikonur on June 2, 2003, began its mapping campaign early in 2004, and will have completed its nominal mission by the time of the conference (Neukum et al., this conference). The spacecraft is equipped with HRSC (High-Resolution Stereo Camera), a multiple line scanner operated in the pushbroom mode. The camera has nine CCD line sensors, 5184 pixel each, for imaging of large areas at high resolution (10 m from an orbit pericenter of 250 km) in four color channels, and in 5-fold stereo. HRSC has been specifically designed for 3-D-mapping of the planet with high precision. For the topographic analysis of HRSC data, a comprehensive software system comprising image correlation, object point determination, DTM interpolation, and map projection has been developed. Though ground resolution, data compression, quality of orbit and pointing information, scene contrast, and image texture vary drastically for the images, automated standard procedures allow us to derive Digital Terrain Models (DTM) on a 200 m grid, typically within days. For selected highest-resolution image data -- using adaptive image pre-processing and photogrammetric orbit reconstruction -- mean point accuracies of up to 10 m and DTMs with lateral resolutions of even 50 m can be obtained. A comparison with MOLA (Mars Orbiting Laser Altimeter) data suggests that the altimeter measurements, which typically have high absolute accuracy and consistency, can be used to calibrate the HRSC topographic models in terms of absolute height and positioning; subsequently, the HRSC data can fill data gaps between MOLA shots and tracks. At the time of writing, the camera has covered approx. 47 percent of the surface of Mars with image resolutions better than 100 meter.

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