The High Resolution Stereo Camera (HRSC) on the European spacecraft Mars Express is the first camera on a planetary mission especially designed for photogrammetric and cartographic purposes. Since January 2004 the camera has been taking image data from the Martian surface, characterized by high-resolution, stereo capability and color. These data provide an enormous potential for the generation of 3D surface models, color orthoimages, topographic and thematic maps, and additional products. The image data acquired undergo calibration and systematic processing to orthoimages and 3D data products. Within the international HRSC Science Team Neukum, and the HRSC CoI-Team.the members of the Photogrammetric/Cartographic Working Group are concerned with further refinements in order to achieve highest quality data products. These activities comprise improvements of the exterior orientation of the camera, various approaches to enhance DTM quality, and the generation of maps in the standard scale of 1:200 000 and larger scales as well. The paper reports on these activities and the results achieved so far.
PHOTOGRAMMETRIC ENGINEERING & REMOTE SENSINGO c t o b e r 2 0 0 5 1153
Absfracf -This paper deals with the role of context for automatic extraction of man-made structures from aerial images taken over urban areas. Due to the intrinsic high complexity of urban scenes we propose to guide the extraction by contextual knowledge about the objects. We represent this knowledge explicitly by a context model. Based upon this model we are able to split the complex task of object extraction in urban areas into smaller sub-problems. The novelty presented in this contribution mainly relates to the fact that essential contextual information is gathered at the beginning of the extraction, thus, it is available during the whole extraction, and furthermore, it allows for automatically controlling the extraction process. For data consistency reasons, we use the imagery as the only source for both gaining contextual information and extracting roads. Advantages and remaining deficiencies of the proposed strategy are discussed.
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