While the data obtained from readily available Global Positioning System (GPS) log files appear to be precise and lends themselves to further computer analysis, in many cases they are too inaccurate to yield valid results. This paper presents methods of using low cost, handheld GPS units to obtain accurate near-instantaneous speed data at short intervals. This data allows valid calculations of speed, delay, and acceleration without the need for costly instrumentation and constant recalibration. The accuracy of the data is also independent of the skill and experience of the survey personnel. The availability of robust acceleration data allows more meaningful evaluation of congestion levels, fuel use, noise production and pollutant emissions than has previously been possible. (Author/publisher) For the covering entry of this conference, please see ITRD abstract no. E213656.
Samenvatting