
 The State Plane Coordinate System 
  The history of the state plane coordinate system goes back to sometime around 1930, when an engineer from the North Carolina state government (there are conflicting stores about exactly who this engineer was, and what state agency he worked for) approached the U.S. Coast and Geodetic Survey office. 
  In its modern form, the state plane coordinate system covers all 50 of the United States, but it does not extend beyond the borders of the U.S. The system is designed to have a maximum linear error of 1 in 10,000. 
  UTM system, whose maximum linear error is 1 in 2,500, which, when you multiply both sides by four, translates into a maximum error of 4 in 10,000. 
 www.cnr.colostate.edu /class_info/nr502/lg3/datums_coordinates/spcs.html (909 words) 
