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NAVD 88 was established in 1991 by the minimum-constraint adjustment of geodetic leveling observations in Canada, the United States, and Mexico. It held fixed the height of the primary tide gauge benchmark, referenced to the International Great Lakes Datum of 1985 local mean sea level (MSL) height value, at Rimouski, Quebec, Canada.
Jul 12, 2018 · The North American Vertical Datum of 1988 (NAVD 88) is the vertical control datum established in 1991 by the minimum-constraint adjustment of the Canadian-Mexican-United States leveling observations. It held fixed the height of the primary tidal bench mark, referenced to the new International Great Lakes Datum of 1985 local mean sea level ...
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Nov 4, 2020 · The NAVD 88 used some of the original data from 1929 but also re-leveled about 100,000 km. Originally scheduled to be completed in 1988, it was finished on June 15, 1991. The new datum produced fewer distortions than earlier vertical datums and more accurate elevations, according to Remondi.
Jul 12, 2018 · The Sea Level Datum of 1929 was named the National Geodetic Vertical Datum of 1929 on May 10, 1973. ( Geodetic Glossary, pp. 57) The Sea Level Datum of 1929 is a vertical control datum in the United States by the general adjustment of 1929. Mean sea level was held fixed at the sites of 26 tide gauges, 21 in the United States and 5 in Canada.
NGVD 29 is the abbreviation for the National Geodetic Vertical Datum of 1929, the predecessor to NAVD 88. Due to the advancement of technology and surveying methods, the increased amount of available data and the level of accuracy of that data led to the new datum. The original datum used 26 tide stations throughout the United States and Canada ...
The North American Vertical Datum of 1988 (NAVD 88) is the official vertical datum of the United States, having superseded the older National Geodetic Vertical Datum of 1929 (NGVD 29). Both NAVD 88 and NGVD 29 are geodetic datums, a reference surface of zero elevation to which heights are referred to over a large geographic extent.
The NAVD 88 is based on an adopted elevation at Point Rimouski (Father's Point). It uses Helmert orthometric heights as an approximation to true orthometric heights. By contrast, the NGVD 29 was fixed to a set of reference tide gauges, without correction for local sea surface topography departures, and it used normal orthometric heights as an ...
