Global Positioning Capabilities

he Cultural Resource Group has Global Positioning System (GPS) equipment available for recording the location of cultural features, subsurface test locations and other survey data. This system, developed by the Department of Defense, is based on a constellation of 24 satellites which constantly transmit locational data via radio signals. GPS receivers convert this data to provide the instrument user with an on-the-ground location. The Group employs two Trimble Pathfinder Pro-XRS systems and a Pro-XL for many of its mapping requirements. The Pro-XRS systems allow for real-time differential correction and navigation. GPS, in conjunction with software packages such as AutoCAD, MicroStation and Surfer, can produce detailed maps illustrating the location of excavation and terrain features, as well as elevation changes, entirely by electronic means. The speed, accuracy and ease of use of GPS allow the Group to quickly produce large-scale area maps or detailed site maps which provide the client with the physical aspects of the project area and the work accomplished.

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