What is a State Plane Coordinate System?
• The state plane coordinate system is a set of conformal map projections that cover the entire United States. • A conformal map projection preserves the property of shape; for a small area, angles measured on the map equal angles measured in the field. • The original state plane coordinate systems were developed using NAD27 during the 1930’s. With the development of NAD83, there have also been modifications to state plane coordinate systems.
