15 October 2008

NGS CORS Network Map is growing

Inside GNSS reports an interesting news about the growth of the NOAA’s National Geodetic Survey (NGS) Network Map.

From the news: "The network helps ensure the consistency and accuracy of the nation’s spatial reference system. Each CORS site provides GNSS — GPS and GLONASS — carrier phase and code range measurements, recorded on a 30-second or shorter interval. Data are free and accessible via the Internet. NGS invites organizations and individuals to share data from their permanent GPS base stations by including these stations in the National CORS network, following a rigorous a set of criteria established by the agency. The NOAA CORS network now contains more than 1,200 sites spanning the United States, its territories, and several foreign countries. Surveyors, GIS users, and others can combine their own GPS data with GPS data from the CORS network to determine three-dimensional positional coordinates that approach a few centimeters in accuracy.
... According to NOAA officials, the addition of the new sites significantly improves both the geographic coverage of the CORS network as well as the accuracy with which CORS users can position things, including property boundaries, transportation arteries, buildings and other map-worthy objects. The expanded coverage will also benefit those organizations that apply CORS data to monitor “space weather,” including the distribution of water vapor in the atmosphere and the distribution of free electrons in the ionosphere."

As shown in the screenshot above, the best part of the reference stations are located in the USA and in its allied countries.