Measurements of the control points on the surface of Mercury comprise the basic data for the analytical triangulation that solves for the latitude and longitude of the point. Points are identified on two or more pictures taken by the two television cameras on the Mariner 10 spacecraft. This report discusses the definition of a point, the method of making the measurements, the picture coordinate system, and the removal of distortions. A table gives the 25,504 measurements of 2,378 points on 788 pictures that were used in the computation of the November 1976 control net of Mercury. (See also R-1914, R-2089, R-2091.)
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