Overview of the structure of the model. The SVPGI (A) depends on the green area surface and the presence of playgrounds-sport-recreational facilities (A.2) and key contextual factors (proximity to bicycle paths, safety) (A.3). To calculate the social services map (B), the SVPGI is allocated amongst all citizens (or amongst defined user groups), giving each one an amount proportional to a distance decay function (B.1). The parameters of the function can be adjusted, according to the users' age or other characteristics. The distance can be estimated through the local road network.