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- A horizontal (geometric) datum (or reference frame) forms a basis for computations of horizontal positions on the Earth. It is a collection of specific points on the Earth’s surface that have been accurately identified according to their precise northerly or southerly location (latitude) and easterly or westerly location (longitude).
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What is a horizontal (geometric) datum?
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What is the difference between a horizontal and a vertical datum?
Why do geodesists use a horizontal datum?
Oct 29, 2023 · A horizontal (geometric) datum (or reference frame) forms a basis for computations of horizontal positions on the Earth. It is a collection of specific points on the Earth’s surface that have been accurately identified according to their precise northerly or southerly location (latitude) and easterly or westerly location (longitude).
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).
May 21, 2023 · For instance, in geometry, we use x (horizontal) and y (vertical) coordinates to define points on a two-dimensional plane. The coordinate system used to define locations on the three-dimensional earth is the geographic coordinate system (GCS), based on a sphere or spheroid.
Mar 3, 2020 · What’s the difference between a datum and a geographic coordinate system? A datum is one parameter in a geographic coordinate system (GCS). The datum is the part of the GCS that determines which model (spheroid) is used to represent the earth’s surface and where it is positioned relative to the surface.
Dec 7, 2023 · Datums and Reference Frames. A geodetic datum or reference frame is an abstract coordinate system with a reference surface (such as sea level) that serves to provide known locations to begin surveys and create maps. NGS defines the official geodetic datums for all federal mapping activities in the U.S. and its territories (see Table 1) as part ...
Horizontal datums define the geometric relationship between a coordinate system grid and the Earth's surface. Because the Earth's shape is complex, the relationship is too. The goal of this section is to explain the relationship.
