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KCGIS Center

We put geographic information systems to work for King County and beyond
King County GIS Center
King Street Center
201 S. Jackson St.
Suite 706
Seattle, WA 98104

47.59909 N
122.33136 W

47° 35' 56.72" N
122° 19' 52.90" W


TNET—Transportation Network

Program Status Rev. February 24, 2010

Program Overview Rev. February 24, 2010

TNET Data Rev. February 24, 2010

TNET Application ArcGIS Extension Rev. February 24, 2010

Consortium Rev. February 24, 2010

Related Sites Rev. February 24, 2010

Frequently Asked Questions Rev. February 24, 2010

Contact Us Rev. February 24, 2010

Program Status

Status Update: February 24, 2010

The TNET Consortium has been launched and is accepting applications for participant agencies.

The TNET Consortium has shifted into production during the last several months. Two county divisions and one city jurisdiction are now active within a replicated database environment. The Consortium is currently developing a service level agreement with the WSDOT statewide transportation data initiative WA-Trans.

Please see Consortium for further information on the TNET program or participation procedures.

Program Overview

What Is TNET? | Why TNET? | History | Benefits | Components

What Is TNET?

Sponsored by King County Department of Transportation and in partnership with the county’s Department of Natural Resources GIS Center, Metro Transit and Road Services Divisions have embarked on a major data development and integrated maintenance program resulting in a comprehensive, highly accurate and current dataset comprising all transportation-related spatial and attribute data for the King County region. Technological solutions have been successfully implemented enabling multiple data maintainers countywide to keep the centrally housed geodatabase current with real-world transportation pathway deletions, additions and improvements.


The sharing of transportation-related geographical data has been common practice for years, but only recently has the technological infrastructure advanced to the level that allows shared data maintenance of a centrally housed geodatabase by widely dispersed multiple users. Until now the cross-boundary data acquired on data CDs quarterly, semiannually or even annually could be out of currency even before distribution. Spatial variances, street naming convention variances, and address range issues are some other problems experienced with this approach. Resolving such issues as well as taking full advantage of current technology led to the TNET (Transportation Network) Consortium. This will enable King County Metro Transit, Road Services, other county agencies such as E-911, as well as Sound Transit Rail, Washington State Ferries and the transportation planning departments of all participating cities within Metro Transit's service area to seamlessly interact with each other in geographical data terms as the region's transportation needs and issues evolve towards ever deepening complexities and interdependence.


During the past decade there have been several attempts within the Puget Sound region to produce a transportation network that is integrated and works for all agencies. These have generally been less successful because, although being initially integrated, the network diverged as each agency attempted to maintain its copy. These copies were generated for a variety of reasons, including the need for data control and the ability to attach related datasets and maintain them efficiently, and for different functions, such as planning versus operations. Most importantly, copies were made because there was no easy way to maintain the entire network at one location and give everyone control or allow participants to update their local copies. The TNET program eliminates the need to redundantly maintain local copies of the transportation network dataset.

The King County Road Services division developed the initial line work in 2002 based on the most current data available at the time from various cities within the county. This was digitized using the best available orthophotography, randomly GPS’ed, and attributed from the King County Street Network. After extensive integrity testing and constant updating for currency the dataset entered production in December, 2006.


Participants in the TNET Consortium will realize the following benefits:

  • Reduced data costs
  • Maximized data quality
  • Minimized data conflicts
  • Data attribute standardization
  • Improved participant operations
  • Leveraged technology investments
  • Facilitation of cross-jurisdictional decision making
  • The fostering of regional working relationships and cooperation


The primary components of the TNET program are:

  1. A high-accuracy, multi-modal, dynamically maintained dataset.
  2. An ArcGIS application (TNET Attribute Editor extension) provided free to each participating agency, enabling its data editor(s) to maintain the portion of transportation features within their jurisdictional boundary that is part of a regional, yet single integrated database.
  3. consortium of data owners at local cities, county departments, and other agencies each of whom is responsible for ongoing maintenance. Please go to the Consortium page for sign-up and membership documentation.
  4. Installation, training and technical support service gratis for participating agencies.

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