What are the horizontal accuracy requirements for the various orders of stations (AA, A, B, first, second, third)?
These are defined in the Federal Geodetic Control Subcommittee publications “Standards and Specifications for Geodetic Control Networks,” September 1984, and “Geometric Geodetic Standards and Specifications for Using GPS Relative Positioning Techniques,” version 5, May 11, 1988, reprinted with corrections August 1, 1989, both available from the National Geodetic Survey. • I have the latitude and longitude for a particular site. Can I convert this into a state plane coordinate or UTM grid coordinate? Can NGS do this for me? Yes, NGS has software available (GPPCGP (v.2.0) for NAD 27 and SPCS83 (v.2.0) for NAD 83) to convert coordinates from latitude and longitude to state plane coordinates and the reverse. Program CORPSCON (v.4.1), written and maintained by the U.S. Army Corps of Engineers and available through NGS, is a useful program which combines NADCON (v.2.1), a program which converts geographic positions from older NGS datums to NAD83, with GPPCGP and SPCS83. There is also softwar
