期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2006
卷号：XXXVI Part 4
出版社：Copernicus Publications
摘要：Recent Mars missions like ESA's Mars Express (MEX) and NASA's Mars Global Surveyor (MGS) capture the Martian surface at high resolution and in 3D. For instance, the MEX instrument High Resolution Stereo Camera (HRSC) acquires images at a resolution of up to 12m per pixel. Area based image matching within stereo pairs of HRSC images can be used to determine numerous points of the Martian topography. The MGS instrument Mars Orbiter Laser Altimeter (MOLA) acquires surface points by range measurement. Sophisticated methods enable the derivation of DTMs from such datasets. Currently, geological investigations regarding the Mars are mostly based on human driven interpretation of images (e.g. captured by HRSC/SRC on MEX, Mars Orbiter Camera (MOC) on MGS or THEMIS on Mars Odysee), photometry analysis (e.g. HRSC), and measurements and 3D analysis of stereo pairs of images. If Digital Terrain Models (DTMs) are considered (e.g. HRSC, MOLA), their interpretation often is reduced to the analysis of profiles derived thereof. Overall analysis of DTMs is rarely performed. Raster based geometry analysis allows fast, efficient and automatic mathematical analysis of terrain models (e.g. computation of curvature, exposition or slope). Hydrological analysis methods such as the detection of depressions, potential river lines and watersheds, or the derivation of catchment areas are predestined to be realized in a raster based manner, as well. In this paper, an approach for the implementation of hydrological analysis methods as systolic processes (i.e. the conditions of the cells of a DTM are derived synchronously) is described. The visualization of the results is prepared by means of special filtering operations. Exemplary applications on high resolution DTMs derived from HRSC images and comparisons to low resolution models derived from MOLA points, are presented and discussed. Their applicability for geological analysis is stressed, as well
关键词：DEM/DTM; Raster based analysis; Mars; HRSC; MOLA
