Sea Level Datum of 1929

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v · datum established for vertical control surveying in the United States of America by the General Adjustment of 1929. The datum was used to measure elevation (altitude) above, and depression (depth) below, mean sea level (MSL). Mean sea level was measured at 26 tide gauges: 21 in the United States and 5 in Canada. The datum was defined by the observed heights of mean sea level at the 26 tide gauges and by the set of elevations of all bench marks resulting from the adjustment. The adjustment required a total of 66,315 miles (106,724 km) of leveling with 246 closed circuits and 25 circuits at sea level. Since the Sea Level Datum of 1929 was a hybrid model, it was not a pure model of mean sea level, the geoid, or any other equipotential surface. Therefore, it was renamed the National Geodetic Vertical Datum of 1929 (NGVD 29) in 1973. The NGVD 29 was subsequently replaced by the North American Vertical Datum of 1988 (NAVD 88) based upon the General Adjustment of the North American Datum of 1988. See also Altitude Datum (geodesy) Geodesy Mean sea level North American Vertical Datum of 1988 Storm Surge 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 сделать НИР HMS Impregnable (1786) WWWOFFLE Look at other dictionaries: North American Vertical Datum of 1988 — Geodesy Fundamentals Geodesy · …   Wikipedia Elevation — The elevation of a geographic location is its height above a fixed reference point, often the mean sea level. Elevation, or geometric height, is mainly used when referring to points on the Earth s surface, while altitude or geopotential height is …   Wikipedia Mount Daniel — Elevation 7960+ ft, (2426+ m) NGVD 29 …   Wikipedia Rhode Island — This article is about the U.S. state of Rhode Island. For other uses, see Rhode Island (disambiguation). RI and R.I. redirect here. For other uses, see RI (disambiguation). State of Rhode Island and Providence Plantations …   Wikipedia Montenegro — This article is about the country in Europe. For other uses, see Montenegro (disambiguation) and Crna Gora (disambiguation). Montenegro Црна Гора Crna Gora …   Wikipedia Rotterdam — Infobox Settlement official name = Rotterdam nickname = Rotjeknar , Rotjeknor , Waterstad , Maasstad , Manhattan aan de Maas , Roffa motto = Sterker door strijd (Stronger through Struggle) imagesize = 275px image caption = flag size = 125px image …   Wikipedia Chennai Port — (Madras Port) Chennai Port Location Country …   Wikipedia Connecticut — This article is about the U.S. state of Connecticut. For the river, see Connecticut River. For other uses, see Connecticut (disambiguation). State of Connecticut …   Wikipedia Taconic State Parkway — Taconic State Parkway …   Wikipedia New Jersey — This article is about the U.S. state of New Jersey. For other uses, see New Jersey (disambiguation). NJ redirects here. For other uses, see Nj (disambiguation) …   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”