Od Flow Fitting System Improvements

On the basis of the research of domestic and international OD data processing technique and steps, this paper further founds the comparatively consummate system of OD flow fitting. This paper improves the system of OD flow fitting and makes it systematic form several links. Ensuring the OD flow fitting scientific and reliable. The major content of this paper includes: handling and inspecting of unusual data, analyzing the method and adaptability of crossing abstraction, traffic zone problem, the mathematical theory and application problem of road traffic impedance, the influence analysis of information effect to road impedance function, as well as having a study of the method of the visible analysis of the OD flow fitting result. Finally, the theory and method mentioned in the paper above are put into practices by using TangSan OD investigation data, having gotten expected effect.