North American Vertical Datum of 1988

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History of geodesy NAVD29 · ...
v · datum of orthometric height established for vertical control surveying in the United States of America based upon the General Adjustment of the North American Datum of 1988. The 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 tidal bench mark, referenced to the International Great Lakes Datum of 1985 local mean sea level height value, at Rimouski, Quebec, Canada. Additional tidal bench mark elevations were not used due to the demonstrated variations in sea surface topography, i.e., the fact that mean sea level is not the same equipotential surface at all tidal bench marks. The NAVD 88 replaced the National Geodetic Vertical Datum of 1929 (NGVD 29), previously known as the Sea Level Datum of 1929. It is important to note that, while the computed elevation of some fixed point might differ depending on which datum is used, the elevation of that point relative to some other nearby point did not change with that datum change. See also Altitude Geodesy National Geodetic Vertical Datum of 1929 Sea Level Datum of 1929 Topographic elevation Topography Reference ellipsoid Geoid External links "United States Geological Survey home page". http://www.usgs.gov/.  "U.S. National Geodetic Survey home page". http://www.ngs.noaa.gov/.  "Geodetic Glossary". United States National Geodetic Survey. http://www.ngs.noaa.gov/CORS-Proxy/Glossary/xml/NGS_Glossary.xml.  "Orthometric Height Conversion tool". United States National Geodetic Survey. http://www.ngs.noaa.gov/cgi-bin/VERTCON/vert_con.prl.  Wikimedia Foundation. 2010. Игры ⚽ Поможем решить контрольную работу WWWOFFLE Valea Adâncă River (Greci) Look at other dictionaries: North American Datum — Triangulation station at Meade s Ranch Fundamental station for the North American Datum of 1927 Geodesy …   Wikipedia North Palisade — from Windy Point (by Ansel Adams, 1936) Elevation …   Wikipedia North Dakota — This article is about the U.S. state of North Dakota. For other uses, see North Dakota (disambiguation). State of North Dakota …   Wikipedia North Carolina — This article is about the U.S. state of North Carolina. For other uses, see North Carolina (disambiguation). The Old North State redirects here. For the song of the same name, see The Old North State (song). State of North Carolina …   Wikipedia Sea Level Datum of 1929 — Geodesy Fundamentals Geodesy · …   Wikipedia Table of the major 4000 metre summits of North America — Main article: Mountain peaks of North America The following sortable table lists the 124 mountain peaks of greater North America with at least 4000 meters (13,123.4 feet) of topographic elevation and at least 500 meters… …   Wikipedia Table of the most isolated major summits of North America — Main article: Mountain peaks of North America See also: Table of the highest major summits of North America, Table of the most prominent summits of North America, and Table of the major 100 km summits of North America The following sortable… …   Wikipedia List of the most prominent summits of North America — Main article: Mountain peaks of North America The following sortable table lists the 200 most topographically prominent mountain peaks of greater North America. This article defines greater North America as the portion of the continental landmass …   Wikipedia Mountain peaks of North America — Main article: Geography of North America Mount McKinley (Denali) in Alaska is the highest mountain peak of North America. This article comprises three sortable tables of major mountain peaks of greater North America. This article defines grea …   Wikipedia Table of the major 100 km summits of North America — Main article: Mountain peaks of North America The following sortable table lists the 234 mountain peaks of greater North America with at least 100 kilometers (62.14 miles) of topographic isolation and at least 500 meters… …   Wikipedia 18+ © Academic, 2000-2024 Contact us: Technical Support, Advertising Dictionaries export, created on PHP, Joomla, Drupal, WordPress, MODx. Mark and share Search through all dictionaries Translate… Search Internet Share the article and excerpts Direct link … Do a right-click on the link above and select “Copy Link”