Methods and results for primary and secondary triangulation of the martian surface. The primary network is based on multiphotograph stereophotogrammetry in which the pictures are rotated around fixed centers; these centers are provided as spacecraft stations from the tracking data. The computations use the latest Mars spin axis determined by Mariner 9 experiments and the new first meridian passing through a small crater, Airy-0, seen on Mariner 9 imagery. The second triangulation is performed in the map plane using rectified pictures as map fragments, assumed to be of correct shape. A total of 1205 primary positions are given.
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