Where is the WGS84 datum used for measurements?
The WGS 84 meridian of zero longitude is the IERS Reference Meridian, 5.3 arc seconds or 102 metres (335 ft) east of the Greenwich meridian at the latitude of the Royal Observatory. The WGS 84 datum surface is an oblate spheroid with equatorial radius a = 6378137 m at the equator and flattening f = 1/298.257223563.
What is WGS84 system and how is it related to the GPS position computation?
WGS 84 is the standard U.S. Department of Defense definition of a global reference system for geospatial information and is the reference system for the Global Positioning System (GPS). It is compatible with the International Terrestrial Reference System (ITRS).
What are the 5 latitude lines?
Important lines of latitude:
- the equator (0°)
- the Tropic of Cancer (23.5° north)
- the Tropic of Capricorn (23.5° south)
- the Arctic circle (66.5° north)
- the Antarctic circle (66.5° south)
- the North Pole (90° north)
- the South Pole (90° south)
What is the World Geodetic System ( WGS84 ) based on?
WGS84 is based on a consistent set of constants and model parameters that describe the Earth’s size, shape, and gravity and geomagnetic fields. WGS84 is the standard U.S. Department of Defense definition of a global reference system for geospatial information and is the reference system for the Global Positioning System (GPS).
Which is the semi major axis of the WGS84?
These are the semi-major axis of the WGS84 ellipsoid, the flattening factor of the Earth, the nominal mean angular velocity of the Earth, and the geocentric gravitational constant as specified below. The value of GM includes the mass of the Earth’s atmosphere.
What does WGS84 stand for in military category?
WGS84 is the standard U.S. Department of Defense definition of a global reference system for geospatial information and is the reference system for the Global Positioning System (GPS). It is compatible with the International Terrestrial Reference System (ITRS).
What are the different types of geodetic coordinate systems?
Johannes B. Ries, in Small-Format Aerial Photography, 2010 Two basic types of coordinate systems exist for geographic data: geodetic coordinate systems based on map projections and geographic coordinate systems based on latitude and longitude (for details, see for example Hake et al., 2002; Longley et al., 2006).