This article demonstrates the operation of a simple optimal location-allocation technique for solving the problem of locating one or several community recycling center(s) within a residential area. The article attempts to measure both transportation and externality costs in comparable units, and to incorporate them into the model. A sensitivity analysis of the results at the level of the nuisance provides further insight into the operation of the model and the relative importance of the quantification of pollution in applied location-allocation problems. Key Words: externality, facility location, location-allocation model, NIMBY, waste management.* We want to thank the editors of The Professional Geographer and the anonymous reviewers for their time and insightful comments. We are also very grateful to the local authorities of La Bruyère for their help and numerous discussions.
Spatial interaction model and aggregation of places. The example of crime data. — This paper tests the effect of spatial data aggregation on the results of an interaction model applied to crime data. Several statistics are used to test the sensi- vity of the results to the level of aggregation and to the way data are aggregated. The results suggest the need for care and critical consideration in choosing the size and shape of spatial units.
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