Topological and Contiguous Accessibility

Accessibility is measured in two different ways:

• Topological. The first example considers a system of nodes linked by transport infrastructures. For seven nodes (a to g) located at an equal distance of each other, node d is the most accessible because it represents the minimal summation of total distances with all other nodes. Accessibility is measured only for nodes, while the intervening spaces are not considered outside the distance they represent.
• Contiguous. The second example considers a continuous space, here represented as a grid where each cell was assigned a level of accessibility. Although the accessibility values are here qualitative (ranking from least to most) a quantitative value can also be allocated for each cell.

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