This synthesis report will be of interest to various transportation-related groups around the world involved in collecting positional data with global positioning systems (GPS) and integrating these data into existing geographic information systems (GIS). The focus is on the major issues that these groups are facing with data collection, data smoothing, and data integration, including identification of inaccurate, bad, or missing data points, and the lack of standard map matching algorithms. It addresses the fact that each application uses its own GPS equipment, GIS database, and internal set of GPS data processing rules, and that information sharing and coordination has been limited. This synthesis was accomplished through a literature review and a survey of the state-of-the-practice activities in GPS data collection, data smoothing, and map matching. (Author/publisher) This report may be accessed by Internet users at http://gulliver.trb.org/publications/nchrp/nchrp_syn_301.pdf
Samenvatting