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The Environmental Data Center in University of Rhode Island's Department of Natural Resources Science has
provided Global Positioning System (GPS) Base Station reference files to the public, free of charge, since 1991.
Up until July of 2001, the system consisted of a Trimble Pathfinder Community Base Station receiver
equipped to collect and serve single frequency, coarse acquisition (C/A) code GPS data.
Supporting many natural resource-level mapping applications requiring 2 to 5 meter accuracy,
this GPS reference station was one of the first of it's kind to operate in the Northeast U.S.A.
Since then civilian use of GPS has grown exponentially and demand for more precise positioning data has
increased. The transportation, engineering, and environmental communities are employing high-order GPS
field units capable of receiving the more precise carrier phase component of the GPS signal with which
positional accuracies of less than 1 centimeter are achieved.
Through a grant from the University of Rhode Island Transportation Center we have upgraded our system to a high-order
Trimble model 4700 reference station.
The new Continuously Operating Reference (CORS) station, logs data from both L1 (C/A code) and L2 (carrier)
frequencies at a 5 second interval, 24/7. The differential correction files are provided in several standard
formats and direct downloading is available from within Pathfinder Office software.
This system is also an established node (URIL) in the national network of Cooperative CORS stations
coordinated by the National Geodetic Survey.
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This service is sponsored by the University of Rhode Island Transportation Center, Department of Natural Resources
Science, Environmental Data Center, and the Cooperative Extension Renewable Resource Extension Act,
in cooperation with Rhode Island Department of Transportation and Maine Technical Source.
Comments to
gps@edc.uri.edu
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