Describes a coordinate system for georeferencing.
A 3D geographic coordinate system has the following axes:
X: Geodetic longitude
Angle from the prime meridian plane to the meridian plane passing through the given point, eastwards treated as positive.
Y: Geodetic latitude
Angle from the equatorial plane to the perpendicular to the ellipsoid through a given point, northwards treated as positive.
Z: Ellipsoidal height
Distance of a point from the ellipsoid measured along the perpendicular from the ellipsoid to this point. Positive if upwards or outside of the ellipsoid.
A projected coordinate system has the following
East pointing axis used in 2D projected coordinate systems.
North pointing axis used in 2D projected coordinate systems.
Vertical coordinate systems have a different
Z axis, usually gravity-related height or depth.
The map projection that translates between geographic coordinates (latitude, longitude) and map coordinates (easting, northing).
The vertical datum this coordinate system is based upon (
null defaults to ellipsoid height).