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The effect of distance over spatial interactions (distance decay) can be represented as a classic non-linear (exponential) relationship where location A has interactions with other locations (B, C, and D), each at a different distance. The relationship assumes that each location has the same size, level of complementarity, and that

Source: adapted from E.J. Taaffe, H.L. Gauthier and M.E. O’Kelly (1995) Geography of Transportation, Second Edition, Upper Saddle River, NJ: Prentice Hall, p. 223. Technological innovations impacted the friction of distance, which is reflected in the reduction of the beta exponent used on spatial interaction models. Lower beta values imply

Variations of the beta, alpha, and lambda exponents have different impacts on the level of spatial interactions. For instance, the relationship between distance and spatial interactions will change according to the beta exponent. If the value of beta is high (higher than 0.5), the friction of distance will be much

The general formulation of the spatial interaction model is stated as Tij , which is the interaction between location i (origin) and location j (destination).Vi is the attribute of the location of origin i, Wj is the attribute of destination j, and Sij is the attribute of separation between the location

Constructing an origin/destination matrix requires directional flow information between a series of locations. The above figure represents movements (O/D pairs) between five locations (A, B, C, D, and E). From this graph, an O/D matrix can be built where each O/D pair becomes a cell. A value of 0 is

Representing mobility as a spatial interaction involves several considerations:

A spatial interaction between location A and B can occur only if three fundamental conditions are met:

Author: Dr. Jean-Paul Rodrigue A spatial interaction is a realized flow of passengers or freight between an origin and a destination. It is a transport demand / supply relationship expressed over a geographical space. 1. Conditions for Spatial Flows Estimating flows between locations is a methodology of relevance to transportation.

The above figure illustrates a simple intermodal chain involving an exporter, an importer as well as the different carriers and terminals in between. It assumes one full dry container load (reefers or hazardous materials trade would generate more transactions and information). For an intermodal transportation chain to take place, a