Photogrammetric evaluation of Mariner 9 photography

Abstract

Mariner 9 images, reconstructed from reduced data record tapes on an Optronics Photowrite device, provided stereo models for photogrammetric map compilations. As most models could be constructed only by combining pictures taken from different orbits, unconventional photogrammetric procedures were developed by using mission support data. Because of the extremely small model scale and limitations of the AP/C analytical plotter, curvature corrections were made by an off-line computer. This report discusses the compilation of three photo maps (contour lines superimposed on rectified pictures). The areas, selected because of their geologic interest, include Nix Olympica, South Spot, and a part of the Coprates canyon system. After curvature corrections Nix Olympica and South Spot are shown to have elevations of about 23 and 7 km, respectively, above their surrounding plains; the part of the canyon system mapped has a depth of about 4 km.