TOPOGRAPHY OF APOLLINARIS-PATERA AND MAADIM-VALLIS - AUTOMATED EXTRACTION OF DIGITAL ELEVATION MODELS

We have used automatic extraction of digital elevation models (DEMs) f rom stereo imagery of Mars to produce DEMs of parts of the Aeolis quad rangle of Mars. The method uses automated stereo matching based on an adaptive least squares correlation technique, which can be applied to Viking Orbiter imagery. A demonstration of the technique is presented, which focuses on the volcano Apollinaris Patera (186 degrees W, 9 deg rees S), and the channel Ma'adim Vallis (183 degrees W, 20 degrees S). The topographic information derived is compared with previous determi nations of topography, and a brief discussion of the relationship of t he topography to the processes that have acted in the area is given. D EMs derived from stereomatching are an invaluable resource for terrain interpretation, and will provide a complementary technique to direct topographic measurements such as future missions to Mars will provide.