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Time and/or accuracy dependent weights for network generation in a digital map

  • US 9,341,488 B2
  • Filed: 12/23/2010
  • Issued: 05/17/2016
  • Est. Priority Date: 12/23/2009
  • Status: Active Grant
First Claim
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1. A method for generating, refining and/or extending a digital map using traces derived from probe data, said digital map storing a plurality of line segments spatially associated within a coordinate system, at least one, and preferably all, of the line segments having an associated segment weight value, the method comprising a computer performing the steps of:

  • providing at least one probe trace having a defined creation date;

    assigning a trace weight value to the at least one probe trace;

    adjusting the position of a line segment associated with the at least one probe trace based on the segment weight value of the line segment and the trace weight value;

    adjusting at least one of the trace weight value and the segment weight value as a function of the time span between a recalculation date and the trace creation date, comprising;

    dividing a maximal time period into a plurality of bins, each bin representing a respective portion of time between the recalculation date and the maximal time period;

    assigning each bin a factor;

    associating the trace with a specified one of the bins corresponding to the trace creation date; and

    calculating the trace weight value as a function of the factor assigned to the bin associated with the trace;

    removing a line segment from the digital map when a segment weight value of the line segment falls below a threshold.

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