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      • A datum is a fixed reference point or surface used to measure elevations and locations. On the other hand, elevation refers to the vertical distance or height of a specific point relative to a datum or benchmark.
      www.ncesc.com › geographic-pedia › what-is-a-building-datum

      What is a building datum? - Geographic Pedia

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  3. buildingonland.com › what-a-datum-or-benchmark-isWhat a Datum, or Benchmark Is - Building On Land

    Jun 27, 2019 · As a term it has many uses, but in design and construction, a datum refers to a vertical measurement taken in relation to a universal elevation, such as sea level. Some folks use the word benchmark interchangeably with the word datum. It is true that a benchmark is a datum in and of itself.

  4. vdatum.noaa.gov › docs › datumsNOAA/NOS's VDatum: A tutorial on datums

    The WGS84 ellipsoid differs very slightly from the GRS 80 ellipsoid. The difference in flattening between these two ellipsoids causes a maximum departure of 0.1 millimeter in ellipsoidal height at the Earth's pole. This difference is considered negligible for VDatum.

  5. www.foresitegroup.net › post › understanding-navd-88UNDERSTANDING NAVD 88 AND NGVD 29 ELEVATION MEASUREMENTS

    In contrast, the process for calculating NAVD 29 included only 106,724 (km) of leveling and 100,000 benchmarks. It’s important to note there is roughly a one-foot difference between the two datums, depending on the location in the country.

  6. www.usgs.gov › about › organizationGuidance on Use and Documentation of Horizontal and Vertical ...

    The product refers to an altitude or an elevation (orthometric height). State the vertical datum name and year in that document. Example: "Vertical coordinate information is referenced to the North American Vertical Datum of 1988 (NAVD 88)."

  7. www.speed-screed.com › knowledge-centre › datum-levelDatum Level - Exactly What Is It? Essential in construction

    A Datum Level is an arbitrary horizontal plane on a construction project used as a reference point for all other vertical dimensions to be measured. It is used to highlight differentials between vertical heights of floor levels along with differing levels of two separate points on the site.

  8. www.asce.org › publications-and-news › civilGetting the height right: The North American Vertical Datum ...

    Nov 4, 2020 · HEIGHT DIFFERENCES BETWEEN NAVD 88 AND NGVD 29 IN CONTERMINOUS UNITED STATES; UNITS = CM (NOAA) According to the NGS website, surveyors used a method called Differential or Spirit Leveling, where a rod is held on a mark with a known elevation. “A reading is taken on the rod, which provides the elevation of the line-of-sight through the ...

  9. www.ncesc.com › what-is-a-building-datumWhat is a building datum? - Geographic Pedia - NCESC

    May 20, 2024 · On the other hand, elevation refers to the vertical distance or height of a specific point relative to a datum or benchmark. 4.

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