18. November 2007
Coordinates are variables from
the analytical geometry to describe positions in a coordinate
Coordinate Systems are geometric
structure elements and reference systems for coordinates.
Special coordinate systems are used in describing mathematically shape and size of geodetic
earth models or in map
Coordinate Reference Systems are
coordinate systems in combination of a spatial datum to
describe spatial position through spatial coordinates.
A spatial datum describes the
position, size and orientation of a coordinate system regarding to
the physical or geographical earth.