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   What is the difference between a horizontal and a vertical datum?

   • A horizontal datum is used to measure a location across the Earth 's surface, in latitude and longitude or another coordinate system; a vertical datum is used to measure the elevation or depth relative to a standard origin, such as mean sea level (MSL).

   Geodetic datum - Wikipedia

   en.wikipedia.org/wiki/Geodetic_datum

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   What is the difference between a horizontal and a vertical date?

   • Horizontal Datum:  The North American Datum of 1983 (NAD83)  Vertical Datum:  Typically the North American Vertical Datum of 1988 (NAVD88), although the National Geodetic Vertical Datum of 1929 (NGVD29) and local reference datums are used in some areas outside of the conterminous United States.

   What is the projection, horizontal datum, vertical datum, and

   www.usgs.gov/faqs/what-projection-horizontal-datum-vertical-datum-and-resolution-usgs-digital-elevation-model

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   What is an example of a horizontal geodetic datum?

   • The NAD 27 is an example of horizontal geodetic datums; the NGVD 29 and NAVD 88 are the most two common nationwide vertical datum systems. The earth's surface is approximated in size and shape by the geometric surface that is termed an ellipsoid.

   NOAA/NOS's VDatum: A tutorial on datums

   vdatum.noaa.gov/docs/datums.html

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   What is a geometric datum?

   • This geometric datum allows measurement of positions relative to an ellipsoid model of the Earth (latitude, longitude and ellipsoid height). It replaced previous “horizontal datums” that only provided latitude and longitude information. A Terrestrial Reference frame provides a set of coordinates of some points located on the Earth's surface.

   Datums and Reference Frames | Datums | National Geodetic Survey

   www.ngs.noaa.gov/datums/index.shtml

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3. en.wikipedia.org › wiki › Geodetic_datumGeodetic datum - Wikipedia

   en.wikipedia.org › wiki › Geodetic_datum

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   A horizontal datum is used to measure a location across the Earth's surface, in latitude and longitude or another coordinate system; a vertical datum is used to measure the elevation or depth relative to a standard origin, such as mean sea level (MSL).

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

   vdatum.noaa.gov › docs › datums

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   A horizontal datum is a reference system for specifying positions on the Earth's surface. Horizontal datums have been defined by specifying the 2-D geometric surface using a reference ellipsoid and six topocentric parameters expressing origin, and orientation.

5. www.ngs.noaa.gov › datums › indexDatums and Reference Frames | Datums | National Geodetic Survey

   www.ngs.noaa.gov › datums › index

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   Dec 7, 2023 · National Geodetic Survey Datums, Frames and Projections information covering vertical datums, horizontal and geometric datums, new datums, datum transformations, coordinate conversions and tidal datums

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7. www.usgs.gov › faqs › what-projection-horizontalWhat is the projection, horizontal datum, vertical datum, and ...

   www.usgs.gov › faqs › what-projection-horizontal

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   Horizontal Datum: The North American Datum of 1983 (NAD83) Vertical Datum: Typically the North American Vertical Datum of 1988 (NAVD88), although the National Geodetic Vertical Datum of 1929 (NGVD29) and local reference datums are used in some areas outside of the conterminous United States.

8. www.ngs.noaa.gov › datums › verticalNational Geodetic Survey - Vertical Datums

   www.ngs.noaa.gov › datums › vertical

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   Vertical Datums. A vertical datum is a surface of zero elevation to which heights of various points are referenced. Traditionally, vertical datums have used classical survey methods to measure height differences (i.e. geodetic leveling) to best fit the surface of the earth.

9. oceanservice.noaa.gov › facts › datumWhat is a datum? - NOAA's National Ocean Service

   oceanservice.noaa.gov › facts › datum

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   Horizontal datums measure positions (latitude and longitude) on the surface of the Earth, while vertical datums are used to measure land elevations and water depths. The horizontal datum can be accessed and used through a collection of specific points on the Earth whose latitude and longitude have been accurately determined by NOAA's National ...

10. geodesy.noaa.gov › INFO › factsWhat is a datum? | NGS Facts | NGS INFO - About Us | National ...

    geodesy.noaa.gov › INFO › facts

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    Horizontal datums measure positions (latitude and longitude) on the surface of the Earth, while vertical datums are used to measure land elevations and water depths.