Building a Visual Summary of Multiple Trajectories. Natalia Andrienko & Gennady Andrienko http://geoanalytics.net. Introduction. Problem statement.
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Natalia Andrienko & Gennady Andrienko
Trajectories on Wednesday morning (6591 trajectories, shown with 20% opacity)
Result of density-based clustering by route similarity (noise excluded)
How can we see several (all) clusters at once? How can we compare the clusters?
Divide the territory using a suitable mesh*
Transform each trajectory into a sequence of moves between areas (cells of the mesh)
Count the moves between pairs of areas
Represent by arrows with varying thickness
* Voronoi polygons built around characteristic points
Radius 1000m: Radius 2000m: Radius 3000m:
47 clusters (noise excluded)