Mathematics – Logic
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1473k&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1473
Mathematics
Logic
Scientific paper
This abstract is one of a series about our research and development of techniques for radargrammetry (the art and science of making geometric measurements based on radar images, analogous to photogrammetry but taking account of the different principles by which a radar image is formed). We previously described the software tools we have developed [1, 2], which allow us to make controlled image mosaics with positional accuracy more than an order of magnitude better than uncontrolled products, and to create high resolution digital topographic models (DTMs) from radar stereopairs even in areas not illuminated by the sun. Here, we describe the acquisition and processing of a targeted stereo observation of the equatorial zone, yielding a DTM of part of Jackson crater with very high horizontal resolution and vertical precision. It is unfortunate that the Mini-RF transmitter stopped operating in December, 2010 before additional targeted stereo observations could be obtained, because the resolution and swath width of the radar images occupy a "sweet spot" intermediate between the Narrow- and Wide-Angle Lunar Reconnaissance Orbiter Cameras [3], so that in addition to supporting geologic investigations such pairs would have been highly effective for filling in the gaps (on the order of kilometers at low latitudes) between LOLA laser altimetry profiles [4]. Our mapping of Jackson crater revealed significant longwavelength geometric distortions in the DTM. Given the principles by which radar images are formed, such distortions cannot simply be instrument effects (like the optical distortions to which camera lenses are subject) but must arise from errors in the spacecraft trajectory data. We therefore report on our plans to assess the severity and frequency of these errors. This assessment is the first step toward identifying the cause of the problem and developing strategies both to correct the existing data and to ensure that future observations are affected as little as possible. Fortunately, one of the most effective ways to assess distortions in the majority of Mini-RF images simultaneously is by constructing the radargrammetric control network that would in any case be needed in order to produce controlled mosaics.
Barrett Janet M.
Becker Tammy L.
Bussey Ben J. D.
Cook Damon
Howington-Kraus Elpitha
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