Data processing in the National Geodetic Survey

This article deals with the general format, computations and checking of control data which is submitted for inclusion in the National Spatial Reference System as defined by the NGS data base (from which it is distributed to the public in one form or another). The data may come from NGS field parties, NGS contractors, the numerous federal, state, and county agencies or the private sector, all of whom submit field observations to NGS headquarters.