Web-based Geodetic conversion Toolkit

Geodetic Toolkit Conversion Tools is a Smart web-based tools for some coordination conversion routines. The utilities in this package provide methods for converting between Geodetic Positions and State Plane Coordinates.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.

This Geodetic conversion Toolkit package uses NGS program SPCS83 or program GPPCGP to convert NAD83 or NAD27 Geodetic Positions to State Plane Coordinates (SPC)

Interactive Conversions including :

• Latitude/Longitude -> SPC
• SPC -> Latitude/Longitude
• Find Zone

SPCS83 is a Free PC Software that can use converts NAD 83 state plane coordinates to NAD 83 geographic positions and conversely. Includes defining constants for NAD 83 coordinate zones.

NGS Program of Geodetic to SPC packages tools can access HERE while SPCN3 download Link can be find in this LINK

Source: http://free-gis-data.blogspot.com/2011/02/geodetic-toolkit-conversion-tools.html