Geodetic Computations by Electronic Computer

by Gerald F. Clohecy,

Serial Information: Journal of the Surveying and Mapping Division, 1971, Vol. 97, Issue 1, Pg. 97-101

Document Type: Journal Paper


The electronic computer makes the recomputation of old control surveys on the North American Datum of 1927 economically feasible. Restoration of the Massachusetts Town Boundary Survey of 1882–1914, comprising 1,501 main scheme triangulation stations and 7,000 town corner monuments, began in 1967. Completion date for this project has not been determined. Salvage value is approximately 3,500 second-order stations. Computer programs in various stages of development include: Azimuth of a Circumpolar Star at any Hour Angle; Horizontal Angle Station Adjustment; Abstract of Horizontal Directions; Geodimeter Reduction; Formation of Condition Equations; Least Squares Adjustment of Triangulation Net; Forward Position Computation; Inverse Position Computation; Conversion of Geographic Coordinates to Grid Coordinates; Conversion of Grid Coordinates to Geographic Coordinates; and Traverse Computation on the Ellipsoid.

Subject Headings: Computing in civil engineering | Geodetic surveys | Control surveys | Triangulation | Grid systems | Computer software | Geodetic datum | Economic factors | Massachusetts | United States

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