ferrobus.calculate_isochrone

ferrobus.calculate_isochrone#

ferrobus.calculate_isochrone(transit_model, start_point, departure_time, max_transfers, cutoff, index)#

Calculate an isochrone from a single starting point

Computes an accessibility isochrone (travel-time polygon) using the provided spatial index for rapid calculation.

Parameters:

  • transit_model (TransitModel) – The transit model to use for routing.

  • start_point (TransitPoint) – Starting location for the isochrone.

  • departure_time (int) – Time of departure in seconds since midnight.

  • max_transfers (int) – Maximum number of transfers allowed in route planning.

  • cutoff (int) – Maximum travel time in seconds to include in the isochrone.

  • index (IsochroneIndex) – Pre-computed isochrone spatial index for the area.

Returns:

WKT representation of the resulting polygon isochrone.

Return type:

str

Raises:

RuntimeError – If the isochrone calculation fails.