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OVERVIEW

The Oregon DOT Geometronics Unit is developing a state Global Positioning System (GPS) reference station network.  We are partnering with state and local governments, federal agencies, and educational institutions to develop the network.
 
The ODOT Geometronics Unit is responsible for enhancing and maintaining the vertical and horizontal geodetic control infrastructure across the state of Oregon.  The establishment and operation of this permanent GPS CORS network in Oregon will help us accomplish our mission.  
 
This GPS network will consist of GPS Continuously Operating Reference Stations (CORS) that will provide real-time kinematic (RTK) correctors via cellular phone and radio networks.   GPS users that are properly equipped to take advantage of these correctors can survey in the field to the one centimeter accuracy level in real time.
 
SCOPE OF NETWORK
 
ODOT initially plans to establish three sub-networks of GPS reference stations in Oregon during the 05-07 biennium.  Each sub-network will consist of four to five stations spaced at approximately 70 km.
 
The northwest Oregon sub-network will extend from I-5 to the coast and from the Columbia river to the southern Willamette Valley. It will provide vital geodetic control to ODOT  Region One and its partners to support the Interstate 5 Columbia River Crossing bridge project.
 
The southern Oregon sub-network will be in the vicinity of Jackson County and the Deschutes sub-network will be in the vicinity of Deschutes County.  We expect to expand the network to include a major portion of the Interstate 5 corridor, sections of the Interstate 84 corridor,  Highways 101, Highway 97, and major cities during the 07-09 biennium.
 
All three sub-networks will be operated and controlled by GPS network software running on servers at the ODOT Geometronics Unit in Salem.  The GPS network software is necessary to configure and monitor the quality of data from the reference stations, compute GPS correctors, and then provide GPS correctors to field GPS users.    Correctors will be provided in real-time via cell phone internet connectivity.    GPS data from reference stations will be archived and available on-line for users that need to post-process their data.
 
PARTNERSHIPS
 
ODOT Geometronics intends to partner with other state and local government agencies, as well as educational institutions.  We intend to have our partners contribute some of the facilities and GPS equipment for the CORS.  In turn, ODOT Geometronics will purchase and operate the software that will control a network of CORS stations from a central computer.  ODOT Geometronics and Regions would provide some CORS sites, infrastructure, and GPS equipment as necessary.