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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.
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.
Learn about the process of converting text-based descriptions of locations to geographic coordinates, and the history and applications of geocoding. Find out how geocoding relies on street networks, postal codes, and administrative boundaries.
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.
MapQuest is an American free online web mapping service launched in 1996 as the first commercial web mapping service. It offers various services and programs, such as driving directions, satellite imagery, buddy-finder, customized routes, and gas price comparison.
Learn how to convert geographic coordinates among different units, formats, systems and datums. Find formulas, methods and examples for latitude and longitude conversion.
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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