THE GEOGRAPHY OF TRANSPORT SYSTEMS



Potential Accessibility

By considering the same valued graph matrix (L) than the previous example and the population matrix P, the potential accessibility matrix, P(G), can be calculated:

  • The value of all corresponding cells (A-A, B-B, etc.) equals the value of their respective attributes (P).
  • The value of all non-corresponding cells equals their attribute divided by the corresponding cell in the L-matrix.

The higher the value, the more a location is accessible, node C being the most accessible. The matrix being non-transposable, the summation of rows is different from the summation of columns, bringing forward the issue of attractiveness and emissiveness. Node C has more emissiveness than attractiveness (2525.7 versus 2121.3), while Node B has more attractiveness than emissiveness (1358.7 versus 1266.1).