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Microsymposium 38, MS067, 2003 (A4 format)
SURVEY OF MARS CRATER TOPOGRAPHY FROM MOLA DATA. Michael G. G., European Space Agency, Research and Scientific Support Department, ESA/ESTEC, Noordwijk, The Netherlands, greg.michael@esa.int

An algorithm for autonomous identification of crater centres from topography data has been improved in accuracy since [1,2] by taking account of the slope direction on the interior of the crater rim. A crater is identified by maximizing a function which integrates the inwardly directed component of the slope around a ring of given radius for all points over the surface under investigation. The algorithm has been applied to remeasure the coordinates of 19,000 craters from the Viking-based SAI Mars crater catalogue [3] within the MGS MOLA topgraphy data [4]. This being done, a series of radial profiles are extracted for each crater (Fig. 1) and used to attempt to produce a generalized profile for the crater (an average, excluding extreme values). A number of parameters can be derived from the generalized profiles decribing the crater depth, rim, floor, and ejecta blanket, and the variation of these paramers examined over the population. References: [1] Michael G. G. (2002) Vernadsky-Brown 36, abs. [2] Michael G. G. (2003) Planetary and Space Science 51, 563-568 [3] Rodionova J. F. et al., (2000) Morphological catalogue of the craters of Mars, ESA-ESTEC [4] Smith, D.E. and 22 others, (2001) J. Geophys. Res., 106, 23, 689-23, 722 Figure 1. Series of radial profiles.