This processor computes the velocity based on pedestrian trajectories i.e. a list of foot steps. This might be more accurate than using PedestrianVelocityProcessor which uses only positions. For example in the optimal steps model a pedestrian might move multiple times during one time step. Let t = (p1,p2), (p2,p3), and so on, (pn,pn+1) be the trajectory of a pedestrian at the current time step s. Then the processor cuts the trajectory based on how much the processor should look into the past which is controlled by backSteps. By cutting the trajectory is linear interpolated i.e. the cut don't have to be at the end or the beginning of a foot step but can be in between. The velocity is equal to the sum of all length of foot steps divided by the duration. @author Benedikt Zoennchen
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