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Blue lines represent the matched trace points and the triangular signs the unmatched ones.
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Generally, paths that have only matched up to three trace points correspond to incorrect matches.
There is one link without being matched by any trace point between two consecutive matched links.
For this reason we decided to ignore all these small matched paths (that have at most three trace points).
The output of the algorithm is equal to the one presented above: a set with the matched paths and another one with the unmatched trace points.
For each segment, two unambiguous trace points are added in the borders (to force the start and end of the segment to "fit" into the remaining matches).
The score of each candidate is then based on the sum of the least Euclidean distance between each trace point and its matched link (also named as matching distance).
One of these parameters is the average distance between each trace point and its matched link.
On the second restriction, the distance between the last trace point and its matched link must be lower than a given threshold (fixed to 45 m).
One of these parameters stores the average distance between an unmatched trace point and the following matched link or the distance between the last matched link and the following unmatched trace point.
The matched points of the trace are used to update the existing segments on the map, which thus improves road precision.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com