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Similarity between two or more trajectories

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I have the data of trucks (http://www.chorochronos.org/).

This data are gps coordinates of multiple trajectories of trucks in Athens.

I have to calculate the similarity between the trajetories, in order to delete those that are very similar!

Problem:

Red And Green are similar, but blue, black and (red or green) are different trajectories.
I want to delete one of the similares, red or green.

Data are in points (geometry , lat and long , x and y)(coordinates gps), the image are examples of trajectories


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