We have developed a hedonic modeling approach within the GRASS GIS to identify the attractiveness of areas 
around cities to new residential development.  The process considers the effect of driving time to attractors 
such as existing urban areas, roads, highways, intersections and access ramps along with slope and proximity 
to water and forest.  The current urban pattern is used to automatically calibrate the relative effect of the 
different attractors.  Once calibrated, proposed regional planning options can be tested to identify anticipated 
changes in attractiveness to new development.  This model has been applied to many locations across the 
United States and is available for application to any other locations.