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- W78130111 abstract "The National Geodetic Survey (NGS)/National Ocean Survey (NOS) is responsible for the determination of the National Geodetic Reference System (NGRS) for the United States. The NGRS consists of several reference systems and Datums. Determination requires definition, field surveying, and computing. The present reference system for horizontal surveys is defined by the North American Datum (NAD) of 1927 and the present reference system for vertical surveys is defined by the National Geodetic Vertical Datum (NGVD) of 1929. New technology and 50 years of additional surveying have antiquated these Datums. The NGS is currently engaged in two programs to update the NGRS, creating the NAD of 1983 and NGVD of 1987. (Author)" @default.
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- W78130111 date "1982-04-01" @default.
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- W78130111 title "NORTH AMERICAN DATUM (NAD) OF 1983 AND NATIONAL GEODETIC VERTICAL DATUM (NGVD) OF 1987" @default.
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