Document Type

Working Paper

Publication Date



Transportation engineering -- Technological innovations, Geographic information systems, Transportation -- United States -- Planning, Intelligent transportation systems


Updating and maintaining Geographic Information Systems-Transportation data (GIS-T data) is proving difficult. Different database formats needed to support diverse applications leads to inconsistencies and inaccuracies, and duplication in updating. A clearinghouse approach is recommended for the collection and dissemination of new transportation features that can be segmented in different ways to meet the needs of various applications and inserted to update existing GIS-T databases. The clearinghouse approach is advantageous in that it is based on collecting data about new or changed transportation features once and uses the data many times to update existing databases.


Catalog Number DP00-2.

Published by the Center for Urban Studies, College of Urban and Public Affairs, Portland State University.

Submitted for Presentation at the 2001 Annual Meeting of the Transportation Research Board.

Persistent Identifier