National Geodetic Survey (NGS) Geodetic Control Stations, (Horizontal and/or Vertical Control), March 2009

This data contains a set of geodetic control stations maintained by the
National Geodetic Survey. Each geodetic control station in this dataset has either a
precise Latitude/Longitude used for horizontal control or a precise Orthometric
Height used for vertical control, or both. The National Geodetic Survey (NGS) serves
as the Nation's depository for geodetic data. The NGS distributes geodetic data
worldwide to a variety of users. These geodetic data include the final results of
geodetic surveys, software programs to format, compute, verify, and adjust original
survey observations or to convert values from one geodetic datum to another, and
publications that describe how to obtain and use Geodetic Data products and
services.