Dynamic potential attributes

Deviation from the static potential. Factor influencing e_alpha for weighting when calculating the path selection (Description of the method Dynamic Potential).

• Standard value 100 % = Pedestrians follow the direction which is calculated on the basis of the Dynamic Potential.
• 0 % = Pedestrians follow the direction which is calculated on the basis of the Static Potential.

The angles inbetween are obtained from the values inbetween. A useful impact depends on the value of the basic force g.

Time interval after which the potential in each case should be updated.

As the dynamic potential requires a lot of calculation time, an extension of the calculation interval can ensure an acceptable simulation speed with a slow computer and a lot of active dynamic potential attributes. However, a shorter calculation interval improves the results.

If the pedestrian route is part of a pedestrian link, select a sufficiently short calculation interval. If the calculation interval is too large, pedestrians cannot walk around vehicles parked along the route or they have to take an unnecessary detour.

Defines how the delay for occupied grid cells is estimated in relation to unoccupied ones, when a pedestrian must walk around a group of pedestrians, forming a circle or square, and there are no obstacles that could extend the path (Defining global model parameters). Default value for g = 1.5.

• Basic force g = 1.5 and impact 100%: Pedestrians no longer want to use the fastest path and only react to other pedestrians in order to avoid collisions.
• g > 3 and impact of approximately 100% or only slightly below can lead to unrealistic behavior of pedestrians, for example, to zig-zag movements or stopping short.
• If the effect of a dynamic potential with an impact of 100% also appears too weak, increase the value of the parameter g. Do not enter an impact over 100%.
• Basic force g = 0: estimated delay = 0. Impacts simulation as if the dynamic potential was switched off. The estimated travel time is proportional to the remaining path distance. Thus, routing is more likely to take place along the shortest path. Pedestrians only react to other pedestrians in order to avoid collisions.
• Basic force g = 1: the estimated delay is as long as the time it takes to cross this cell in the unoccupied state, i.e. the required time is doubled.

Influence of the direction of movement of a pedestrian on the calculation of the dynamic potential (Defining global model parameters).

Default = 0.7

• h = 0.0: There is no influence.
• h = 1.0: Pedestrians, moving at a free walking speed, are evaluated depending on the direction of the geographically shortest path to the route destination for which the dynamic potential is activated:
• not evaluated if they move in the exact direction of the route destination
• evaluated twice if they move in the exact opposite direction to the route destination
• evaluated once if they move in the exact orthogonal direction to the route destination
• Slower pedestrians in the direction of the destination are graded less than once accordingly.
• Slower pedestrians away from the destination are graded between once and twice.
• h > 1.0: only useful in exceptional cases. Thus a negative value cannot be achieved.