Geodetic Toolkit Conversion

Convert between Geodetic Positions and State Plane Coordinates using the National Geodetic Survey Geodetic Toolkit.

The State Plane Coordinate system provides coordinates on a flat grid for easy computation while maintaining a difference between geodetic and grid distance of
one part in 10,000 or better.

The State Plane Coordinate system divides the U.S. into a hundred or more distinct grid surfaces (Zones).

Do not mix coordinates from one Zone with that in another. In you need to cross Zone boundaries, use Geodetic Positions.

Check the links here.