Variants of this framework have also been applied in Europe (Paracchini et al. Further, the demand for recreation is, in part, a function of distance from a user's home and the supply of recreation sites depends, in part, on the type of recreation available in the vicinity of users. Importantly, the urban transect is a gradual transition across a landscape gradient rather than a distinct division into "urban" and "rural." This can make classifications difficult as different gradients do not coincide in the same places.