Urban tourist flow is an important content in the research of Tourism Geography.Although the study on urban tourist flow has been recognized, systematic studies of measuring urban tourist flows are still under-explored.This study presents a quantitative method for investigating urban tourism flow spatial change in Nanjing city by size-scale, spatial autocorrelation and factor analysis.At the same time, using software Surfer 8.0 and geographic information system, the paper established spatial data model and simulated spatial distribution pattern of tourist flows in Nanjing City.The study concludes that, 1) spatial difference law in tourist flows is found within the city.Tourist flow in Nanjing city still belongs to the spatial polarization stage, but the concentration tends to decline and the diffusion gradually strengthens.2) By examining the indexes of Global Moran’s I and Local Moran’s I, concentration of tourist flow is dominant and concentration and diffusion exist synchronously within the city.The tourist flow distribution has obviously positive spatial autocorrelation, which had been weaker in 1995-1999 and stronger in 2001-2005.With the increasing of the number of tourist nodes, the spatial nodal structure has grown gradually since 1995, reflecting more significant positive autocorrelation (spatial dependence).3) By factor analysis, four concentration and diffusion tourism fields are found.4) By using software Surfer 8.0, spatial distribution pattern is core-periphery model.The core tourist area lies in inner city, presenting convergency and concentricity.Meanwhile, the interaction between the tourist areas increased gradually.Tourist flow distribution curves showed characteristic of waves and leap forward.And 5) according to spatial change of tourist flows in Nanjing City, tourist flow mode was constructed.
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