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Accessibility in spatial applications is the quality of being easy to reach (a) destination location(s). It is an important driving factor in Land Use Modelling and also relevant for many other applications.

impedance

In accessibility analyses, impedances are calculated between origin and destination locations. An impedance can e.g. be the distance, the travel time, the travel costs.

An important distinction need to be made between:

• impedances in a Euclidean space (as the crow flies)
• impedances over a network

With the GeoDMS both type of impedances can be calculated, but usually networks are used to calculate more realistic impedances. The GeoDMS contains network functions to build a network topology and use it in dijkstra functions to calculate impedances per origin point or in an origin/destination matrix (trip table)..

Much attention has been given to make network calculations fast and efficient. This allows users to calculate impedances in large networks in limited time.

applications

• Accessibility measures are calculated and used as driving factors for Land Use Modelling
• Origin destination matrix (trip table) for many applications
• In our projects in the social domain, distances from houses to services are calculated. These distances are important suitability factors for housing for persons with mobility issues.

downloads

• PC4 travel time matrix for Nederland van Boven (in Dutch)