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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.
Vertical measurements, based on distances above or below Mean High Water (MHW), are calculated using the North American Vertical Datum of 1988 (NAVD 88). [1] NAD 83, along with NAVD 88, is set to be replaced with a new GPS- and gravimetric geoid model-based geometric reference frame and geopotential datum, potentially in 2025. [2]
NGVD29 was superseded by the North American Vertical Datum of 1988 , [3] based upon reference to a single benchmark (referenced to the new International Great Lakes Datum of 1985 local mean sea level height value), although many cities and U.S. Army Corps of Engineers "legacy" projects with established data continued to use the older datum. [4]
Note that Wikipedia encourages the use of NAVD 88 and conversions between the two datum can be done using a tool provided by the National Geodetic Survey. The tool is named VERTCON and can be found here. If an elevation is converted to NAVD 88 a citation linking to the source of the original NGVD 29 elevation should be provided, as well as the ...
NAVD 88: N. American Vertical Datum 1988 ... Sets of satellite derived station coordinates and gravimetric deflection of the vertical and geoid height data were used ...
VERTCON is a computer program that computes the modeled difference in orthometric height between the North American Vertical Datum of 1988 (NAVD 88) and the National Geodetic Vertical Datum of 1929 (NGVD 29) for a location in the contiguous United States. [1] The parameters required are the latitude and longitude of the location.
Notch Peak is one of the highest peaks in the House Range, reaching 9,658 feet (2,944 m) NAVD 88.The northwest face of the mountain is a massive carbonate rock (limestone and dolomite) cliff with 2,200 feet (670 m) of vertical rise, making it among the highest cliff faces in North America.
The topographic elevation of a summit measures the height of the summit above a geodetic sea ... NGVD 29 to NAVD 88 online elevation converter @ NGS; Survey Marks and ...