Other tasks

When the OD point datasets are linked to the various networks to allow calculations to progress, they are snapped to the nearest network element. If the distance across which this snapping is allowed to take place is large, distant sites may be snapped to a network edge close to the location of an activity, resulting in an erroneously short travel time.

In order to limit the impact of moving the points to coincide with the network elements, the tolerance was set to a maximum of 250m, to reduce the magnitude of any errors that this might introduce.