Data quality assessment and real-time evaluation of GPS probe data

摘要

Quality assessment of probe data collected from GPS systems is performed by a system and method of determining a value of data points provided by different vendors of such data. Incoming raw probe data is initially analyzed for removal of extraneous data points, and is then mapped to roadway links and smoothed out. The resulting output is processed to determine the coverage value of data provided by a given vendor and enable a comparison between different vendors. Such a model of probe data processing also enables an evaluation of a contribution of further vendors of raw probe data to an existing dataset. Additionally, a real-time performance evaluation of continually-ingested probe data includes building historical and data count profiles, and generating output data represented by a number of data points for a specific distance within a geo-box representing a geographical area, to project a value of raw probe data for a next incremental time period.

主权项

1. A computerized method of assessing a value of traffic speed information in a set of incoming GPS probe data, comprising:
extracting GPS information and one or more parameters from incoming GPS probe data using one or more GPS components configured to receive and process the incoming GPS probe data, the one or more parameters including a measure of confidence of positional measurement precision in the GPS information for determining spatial and temporal coverage on a road network; performing an initial evaluation of the incoming GPS probe data to filter unneeded data points and conduct a preliminary assessment of probe coverage relative to a geographical grouping of roadway links; and modeling the incoming GPS probe data relative to the geographical grouping of roadway links to determine a road network coverage, within a computing environment comprised of hardware and software components that include at least one processor specifically configured to evaluate speed data in the incoming GPS probe data, by:
mapping the GPS probe data to match with the roadway links so that data points comprising the incoming GPS probe data are assigned directly to the roadway links,smearing the GPS probe data by extending speed readings from the roadway links with assigned data points to neighboring roadway links within a given range,summing lengths of the roadway links and neighboring roadway links to calculate a total mileage of all roadway links covered by the GPS probe data,extending the assigned data points across a specified time period using different ranges to determine the road network coverage, anddetermining a qualitative value of the assigned data points by translating a percentage of assigned data points in the road network coverage into an amount of the assigned data points covering a specified amount of miles inside the geographical grouping of roadway links.