Implementation Of Interactive Huff Model

This paper first elaborates on classic theory and ordinary applications of Huff Model; after the model is extended in the field of urban public facility planning, the author develops a desktop application named Huff Modeler and an extension to ArcGIS named Huff Model Toolkit to implement the application of Huff Model in the area of planning in public domain. The applications run in Microsoft .Net Framework 2.0, and ESRI ArcEngine9.2 Runtime is required.This paper verifies the derived applications using the green space system in the city of Luoyang for the year 2008. The desktop application establishes and calibrates Huff model for the study area before analyzes and evaluates the accessibility of the green space facilities in the target system and allows users to make modifications on the original network dataset so as to optimize the target system. In the case study, first the attractiveness of every green space patches is calculated. Second the spatial distance and time cost is solved for every green space patch and every residence points. After that patronage probability is derived and interpolated by the program to generate a probability surface, which reflects the accessibility of green space patches for the local residents. The model permits users to alter the original network such that in the modified system the accessibility of green space patches can be improved to better serve the local residents.The result validates both the program the author has developed and the application of Huff Model in the large-scale planning of urban public facilities. It also shows that in the green space system design, the X value, which is the parameter in the Huff Model controlling the effect of travel time, is higher than its counterpart in retail markets, indicating that most residents do not travel long distance to use those facilities. Consequently, resident-orientated urban public facility design is indispensable to boost the amenity of the eco-city.