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Defining and Measuring Traffic Data Quality

Defining and Measuring Traffic Data Quality. Shawn Turner Texas Transportation Institute ITS America 15 th Annual Meeting May 4, 2005 ~ Phoenix, AZ. FHWA Report. “Traffic Data Quality Measurement: Final Report” http://www.its.dot.gov/library.htm , EDL #14058 Data quality measures

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Defining and Measuring Traffic Data Quality

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  1. Defining and MeasuringTraffic Data Quality Shawn Turner Texas Transportation Institute ITS America 15th Annual Meeting May 4, 2005 ~ Phoenix, AZ

  2. FHWA Report • “Traffic Data Quality Measurement: Final Report” • http://www.its.dot.gov/library.htm, EDL #14058 • Data quality measures • Calculation procedures • Data quality target values • Monitoring costs

  3. Defining Data Quality • Relative term based upon uses • Proposed definition: • Data quality is the fitness of data for all purposes that require it. Measuring data quality requires an understanding of all intended purposes for that data.

  4. Measuring Traffic Data Quality • Data quality categories/measures • Accuracy • Completeness (availability) • Validity • Timeliness • Coverage • Accessibility (usability)

  5. Other Measures • Previous six measures are fundamental for nearly all applications • Other measures may be appropriate for specific applications • Importance • Security • Precision

  6. FHWA Monthly Reports • One-page congestion and data quality report for each city • Identify where and when significant data problems occur • Tracks data quality over time • “What gets measured gets done”

  7. Data Quality Issues • Institutional cooperation • Disconnect between the initial purpose for traffic data versus other possible uses • Who pays to maintain to what quality level? • Identifying and diagnosing data quality problems • Software tools and resources

  8. Presentations • Efforts in Atlanta to benchmark data quality • Guin, URS Corp. • Software tools to identify data quality levels • Petty, Berkeley Transportation Systems • Dealing with data quality in Phoenix • Guerra, Oz Engineerig

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