Each coordinate system is defined by the following:
1) Its measurement framework, which is either geographic (in which spherical coordinates are
measured from the earth's center) or planimetric (in which the earth's coordinates are
projected onto a two-dimensional planar surface)
2) Units of measurement (feet/ meters / degrees)
3) The definition of the map projection for projected coordinate systems
4) Other measurement system properties such as a spheroid of reference, a datum, one or
more standard parallels, a central meridian, and possible shifts in the x- and y-direction