CATS

Clue-aware trajectory similarity

CATS identifies clues among trajectories first and then uses them to 
measure the pair-wise similarity among trajectories.

• aim to couple as many spatially and temporally co-located data points between two trajectories as possible
  • any two points int the different trajectories, the closer two points are, the stronger clues they reveal.
• calculate the clue score between different trajectories

Spatial Decaying Function

The quadratic formula is $-b \pm \sqrt{b^2 - 4ac} \over 2a$