A geodetic control net of the surface of Mercury has been established from the Mariner 10 pictures using photogrammetric methods. These methods and the status of the net as of March 1975 were reported in R-1740. Revisions in the control computation since that time as well as added points and pictures are given in this report. The latitude and longitude of 1,774 primary points in the control net as of January 1976 are listed. The photogrammetric computation incorporates new values for the focal lengths of the Mariner 10 cameras as derived from in-flight lunar pictures. (See also R-1740.)
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