The datum WGS84 (World Geodetic System 1984) is the coordinate reference system used for:
Choose the correct answer
Only topographic maps of India
GPS satellites, defining the earth ellipsoid and origin for global positioning
Plane table surveys only
Historical triangulation networks
Correct Answer
B. GPS satellites, defining the earth ellipsoid and origin for global positioning
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WGS84: reference ellipsoid (semi-major axis a = 6,378,137 m, flattening f = 1/298.257). Used globally for GPS. The geoid (mean sea level) differs from WGS84 ellipsoid by the geoid undulation N (in India: N = -40 to 0 m, i.e., geoid is below ellipsoid). H_MSL = h_ellipsoid - N.
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