Reference networks (Control surveys). [Geodetic systems for earth crustal movement monitoring]
William E. Strange, David B. Zilkoski · OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) · 1991
Control surveying activities of the National Geodetic Survey are reported for the 1987-1990 time period. The report is divided into two parts: horizontal control and vertical control. Particular attention is given to the North American Datum of 1983, high accuracy reference networks, the Global Positioning System and vertical control, vertical field surveys, and special survey projects. 44 refs.