`
`To identify erroneous digital map data, a route guidance engine provides guidance
`
`from a first point to a second point along a road network using data stored in a map
`
`database. The route guidance engine determines whether a vehicle travels the
`
`recommended route or a different route. A map anomaly detection (MAD) engine
`
`compares the trace data to the recommended route data. The MAD engine identifies
`
`points along the recommended route not included in the trace and points along the
`
`trace not included in the recommended route. From this data, the MAD engine
`
`identifies section pairs and performs a filtering step. The MAD engine aggregates data
`
`for all trips from the first point to the second point within a particular period, and
`
`aggregates all trips from all starting points to ending points. The resulting set of points
`
`are points where the stored map data is likely incorrect.
`
`18
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`

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