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The coordinate system in a Global Navigation Satellite System (GNSS) is a system of reference used to specify the position of a point on the Earth's surface. The most commonly used coordinate system in GNSS is the World Geodetic System 1984 (WGS 84), which is based on the Earth's shape as an oblate spheroid (an ellipsoid of revolution).
The WGS 84 coordinate system is defined by the following parameters:
- The Earth's semi-major axis (a) and semi-minor axis (b) which define the size and shape of the Earth's ellipsoid.
- The Earth's flattening (f) which is the ratio of the difference between the major and minor axis to the major axis.
- The Earth's eccentricity (e) which is the square root of the first eccentricity squared (2f-f^2).
The WGS 84 coordinate system also uses a geographic coordinate system, which is based on the latitude and longitude of a point on the Earth's surface. Latitude is the angle between a point on the Earth's surface and the equatorial plane, and is measured in degrees north or south of the equator. Longitude is the angle between a point on the Earth's surface and the Prime Meridian, and is measured in degrees east or west of the Prime Meridian.
The WGS 84 coordinate system is used by the Global Positioning System (GPS) and other Global Navigation Satellite Systems (GNSS) to specify the position of a point on the Earth's surface. The position of a point is represented by a set of coordinates in the form of latitude, longitude, and altitude.
The WGS 84 coordinate system is widely used in mapping, surveying, navigation, and other applications that require the precise location of points on the Earth's surface. It is also used as a reference system for other coordinate systems, such as the Universal Transverse Mercator (UTM) and the State Plane Coordinate System (SPCS), which are used for mapping and surveying at a local level.
Overall, the coordinate system in GNSS is used to specify the position of a point on the Earth's surface. The most commonly used coordinate system in GNSS is the World Geodetic System 1984 (WGS 84), which is based on the Earth's shape as an oblate spheroid and uses a geographic coordinate system based on latitude and longitude. The WGS 84 coordinate system is used by the GPS and other GNSS to specify the position of a point on the Earth's surface and it is widely used in mapping, surveying, navigation, and other applications that require the precise location of points on the Earth's surface.
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