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：2000
卷号：XXXIII Part B4 (/1-3)
页码：469-475
出版社：Copernicus Publications
摘要：In 1998, the Mars Global Surveyor (MGS) started observations of the Martian surface using the Mars Orbiter Laser Altimeter (MOLA) and the Mars Orbiter Camera (MOC). We examine here the potential of MOLA laser altimeter profiles for the creation of a 3-D control point network of the Martian surface. For the Science Phasing Orbits (SPO) 1 stage, we sho w that the difference in elevations between crossover points of MOLA tracks within 1km planimetric distance appear to lie within 25m. This result suggests that MOLA has very high positional accuracy both horizontally and a few metres vertical accuracy. We have also performed a comparison of MOLA heights with the old USGS DTM, which was based on the 6.1mb pressure level determined from Mariner 9 UV spectrometer measurements and radio occultatio n measurements and the 3D control network determined by Wu(1984). The result of this compariso n indicates that the old 3D control network is likely to be in error by as much as a few kilometres. In order to try to improve the global 3D control network, we need to try to register the MOLA altimeter tracks with common features in MOC wide angle and Viking images. An automatic registration techniq ue has been developed which uses specific features based on the visible edges of surface features such as impact craters and small mountains. Morphological features are difficult to extract from MOC and VO images and are often confused b y shado ws. This is especially the case with VO images which were taken under a variety of different solar illumination co nditions. We applied a hierarchical and heuristic edge searching method to match to the rising point of MOLA tracks. In the next step, the generation of Ground Control Points which could form such 3D control networks will be shown using some sample image resolutions from VO images to demonstrate its future potential with the HRSC instrument on the ESA Mars Express mission which is due for launch in 2003
