Rough Calculation of Network Scale of Urban Rail Transit

To calculate roughly the rational scales of Urban Rail Transit network and to make scientific and rational plan for the Urban Rail Transit network, this paper chose the density and the length of Urban Rail Transit network to measure the scale of the network. Basing on an in-depth analysis of influencing factors of the scale of Urban Rail Transit network, with comprehensive selections, several indexes as urban population density, urban per capita GDP and urban acreage were chosen as the precondition of calculations of the scale of Urban Rail Transit network. Method and technique of data mining were introduced and some foreign cities where Urban Rail Transit has maturely developed were chosen as studying objects. This paper takes the influencing factors of the network and network scale of the chosen cities as sample data, and the sample data were trained by a 3-layer BP Neutral Network model. In other words, The BP Neutral Network model for estimating the rational scales of Urban Rail Transit network was built by taking urban population density, urban per capita GDP and urban acreage as inputs, and density and the length of Urban Rail Transit network as outputs. The results show that BP Neutral Network had nonlinear and robust characteristics in the estimation study of scales for Urban Rail Transit.