New Adjustment of NAD-Associated Computer Products

by John G. Gergen, Chf.; Horizontal Network Branch, National Geodetic Survey, National Ocean Survey, NOAA, Rockville, Md.,

Serial Information: Journal of the Surveying and Mapping Division, 1978, Vol. 104, Issue 1, Pg. 1-6

Document Type: Journal Paper


The horizontal geodetic network of the United States comprises over 220,000 stations. Most of these stations were surveyed in the past four decades. Their inclusion into the National Network has gradually strained the accuracy of the 1927 adjustment, which led to the North American 1927 datum, and has made a new adjustment mandatory. Important topics relating to the New Adjustment (identified as North American Datum 1983) are the selection of a new datum, the effect on the coordinate system, as well as new possibilities for data dissemination resulting from advances in electronic computing.

Subject Headings: Geodetic datum | Computing in civil engineering | Geodetic surveys | United States

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