The Land Use Intensity Research Of Beijing-Tianjin-Hebei Region Mainly Urban With The Perspective Of Gravity Model

In the process of regional and urban development,land issues have always been the core issue of serious concern.With the improving of the economic level,the national macro strategy should also be adjusted to adapt to the rhythm of the social development.In this context,the pace of the outgoing open land is accelerating,depends on the development of the past that extensive and cheap way is difficult to generate positive external benefit,but also can effectively improve the quality of economic development.The intensity of land use directly reflect the influence of human activities on the land system,as well as an important driving force of urban development.On the premise of limited land resources,Increasing population and urban expansion cause growing demand for the products and services,and this changes directly affect the sustainability of land system.The land use intensity research use for more questionnaire investigation method on farmers or land unit in regional unit.although can effectively describe the typical sample area intensity of land use change and driving factors,but weak in space expression.unable to grasp the spatial pattern of land use intensity from the macro level,also can't describe the time and space differentiation characteristics in the fine degree.This research started from the connotation of land use intensity,Combining with the characteristics of the urban land in Beijing-Tianjin-Hebei region,Using The BP artificial neural network method to measure the land use intensity of Beijing-Tianjin-Hebei region's main city.Analyzed the spatial distribution characteristics of Beijing-Tianjin-Hebei region land use intensity and time series differences with GIS spatial analysis techniques?statistical analysis and practical investigation method.Combined with the gravity model to discusses the interaction relationship city's coupling relationship and urban land use.The results show that,The land use intensity of main city in Beijing-Tianjin-Hebei region is a growing trend on the whole in nearly 10 years;The difference between city's land development intensity is clear and characterized by spatial agglomeration;The land use intensity and gravity of center city values exist very strong positive correlation,and having a coupling interaction.In the end,forecasted the next research orientation Combined with the study results.