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Learn how to measure and communicate positions on Earth using latitude and longitude, and how different geodetic datums affect the coordinates. Explore the history and standards of the geographic coordinate system and its applications in cartography and geodesy.
The World Geodetic System (WGS) is a standard used in cartography, geodesy, and satellite navigation. The current version, WGS 84, defines an Earth-centered, Earth-fixed coordinate system and a geodetic datum, and also describes the associated Earth Gravitational Model and World Magnetic Model.
Geodetic coordinates are a type of curvilinear orthogonal coordinate system used in geodesy based on a reference ellipsoid. They include geodetic latitude (north/south), longitude (east/west), and ellipsoidal height (also known as geodetic height).
Learn how to convert geographic coordinates among different units, formats, systems and datums. Find formulas, methods and examples for latitude and longitude conversion.
Geopositioning is the process of determining or estimating the geographic position of an object using various methods and systems. Learn about the principles, techniques, and applications of geopositioning, such as GPS, celestial navigation, and visual fixes.
Learn about the USNG, a multi-purpose location system of grid references used in the US. It is based on the UTM coordinate system and provides a compact, user friendly format for local navigation and mapping.
A projected coordinate system is a type of spatial reference system that represents locations on Earth using Cartesian coordinates (x, y) on a planar surface created by a particular map projection. The term easting is used to refer to the x coordinate in many systems such as UTM, and is often paired with northing, the y coordinate.
A geodetic datum is a global or local reference frame for representing the position of locations on Earth by geodetic coordinates. Learn about the concept, history, and types of geodetic datums, and how they relate to GPS, surveying, and cartography.
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