Source: Adapted from Kansky (1963), p. 23.
The Pi index is the ratio between the diameter (d; vertical axis) and length of the network (horizontal axis). A low Pi index is linked with a low level of network development (such as simple corridors) and a high value of Pi is linked with a more extensively developed network (a system of linked cities).
|130 km||75 km||1.733|
|245 km||75 km||3.266|