01043530

Component

The Portland Oregon Regional Transportation Archive Listing (PORTAL) is the official intelligent transportation systems data archive for the Portland metropolitan region. PORTAL has been archiving 20-second speed, count, and occupancy data from the approximately 500 inductive loop detectors in the Portland metropolitan region since July 2004. PORTAL has a web-based interface that provides performance metrics designed to assist practitioners and researchers. In order to provide accurate and useful information, it is essential that PORTAL process and maintain high-quality data, and further it is critical that users understand exactly how the data are processed. Users should also have a clear understanding of the quality of the data that they are viewing or extracting. There are several elements involved in maintaining quality data: effective allocation of maintenance resources for the inductive loop detectors, identification of suspect data values, and proper data aggregation. This paper presents a methodology for automatically detecting malfunctioning inductive loop detectors; describes how suspect data values are detected, handled, and reported in PORTAL; and finally describes PORTAL’s data aggregation procedures. Examples of tools used to communicate data quality to PORTAL users are also provided.

01042056

07-1561

English

11p

2007

Transportation Research Board 86th Annual Meeting

CD-ROM

Figures (4) ; References (14) ; Tables (5)

Data collection; Data quality; Improvements; Information processing; Information technology; Loop detectors; Methodology; Regional transportation; Websites (Information retrieval)

Data aggregation

Portland Oregon Regional Transportation Archive Listings (PORTAL)

Portland (Oregon)

Data and Information Technology; Highways; Planning and Forecasting; I72: Traffic and Transport Planning

Transportation Research Board Annual Meeting 2007 Paper #07-1561

TRIS, TRB

Feb 8 2007 6:12PM