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The North American Vertical Datum of 1988 (NAVD 88) is the vertical datum for orthometric heights established for vertical control surveying in the United States of America based upon the General Adjustment of the North American Datum of 1988.
Vertical datums in Europe. In geodesy, surveying, hydrography and navigation, vertical datum or altimetric datum is a reference coordinate surface used for vertical positions, such as the elevations of Earth-bound features (terrain, bathymetry, water level, and built structures) and altitudes of satellite orbits and in aviation.
In North America elevations are given using either Sea Level Datum of 1929, also called the National Geodetic Vertical Datum of 1929 (NGVD 29) or the North American Vertical Datum of 1988 (NAVD 88). Confusion often occurs when a user sees an elevation value using the newer datum.
For the new general adjustment of the North American Vertical Datum of 1988 (NAVD 88), a minimum-constraint adjustment of Canadian-Mexican-U.S. leveling observations was performed holding fixed the height of the primary tidal benchmark, referenced to the new International Great Lakes Datum of 1985 (IGLD 85) local mean sea level height value, at ...
Jul 12, 2018 · Vertical Datum Conversions (VDATUM) GPS Toolbox; GEOID18 Computation; Adjust Leveling (LOCUS) Horizontal Time-Dependent Positioning (HTDP) Surveys. Survey Project Proposal Form; OPUS Share; Mark Recovery; User-submitted Survey Projects (Bluebooking) Geoid Slope Validation Survey (GSVS) Calibration Base Lines (CBLs) GPS on Bench Marks; GRAV-D ...
The North American Vertical Datum of 1988 (NAVD 88) is the official vertical datum of the United States, having superseded the older National Geodetic Vertical Datum of 1929 (NGVD 29).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.
