Patent ID: 8958983
Filing Date: 2015-02-17
Classification: G01C,G08G

Abstract:
1. A method of processing map data comprising a plurality of the navigable segments representing segments of a navigable route in an area covered by the map data, wherein at least some of the navigable segments have speed data associated therewith representative of a measured speed profile, said measured speed profile comprising a plurality of average speeds of a plurality of navigation devices through the segment for different recurring time periods, the method comprising: receiving position data from a plurality of navigation devices by wireless telecommunication, the position data for each of the navigation devices being representative of the position of the navigation device over time; generating, by at least one processor, at least one updated speed profile indicative of current traffic behavior for a plurality of segments by processing the position data from at least two of the plurality of navigation devices, each updated speed profile comprising data representative of an average speed of travel through the segment for a time period that has recently passed; comparing, by the at least one processor, each updated speed profile with a respective average speed of the measured speed profile for the segment to determine if the average speed difference is above a predetermined threshold; identifying, by the at least one processor, for each navigation device, the segments within a predetermined distance of a current position of each of the navigation devices; and sending the at least one updated speed profile determined to have an average speed difference above the predetermined threshold for any identified segments to each navigation device by wireless telecommunications.