Research on urban accessibility distribution areal model by Floyd algorithm and Kriging interpolation

As an important indicator to measure a city´s regional economic and social value, accessibility is more and more used in tourism and urban planning, transport design, public facilities and some other issues. Traditional accessibility study is mostly focus on a limited number of points. In this paper, GIS technology is used to establish an innovative areal model of the whole city´s accessibility, in order to carry out a more comprehensive analysis of geographical accessibility. Taking Nanjing as a case study, we established the topological road network. The Floyd algorithm was used to carry out the shortest paths between all the nodes. In order to obtain an areal model of the whole city´s accessibility factor, we applied Kriging interpolation compensate for the lack of data, and then used ArcGIS to establish the areal model of Nanjing. Our model matches the actual situation perfectly, proving the effectiveness of the method.