Study On The Spatiotemporal Evolution Characteristics And Layout Optimization Of Rural Residential Areas In Northern Jiangsu

In order to integrate urban and rural development and revitalize the countryside,optimize the spatial layout of the urban and rural living environment,improve the construction and service level of rural public service facilities,meet the needs of farmers’ production and living,and promote rural development.Taking Fengxian County,Jiangsu Province as an example,this paper uses deep learning to study the semantic segmentation of remote sensing images,improves the U-net model for pixel-level extraction of rural residential areas,and establishes a spatial database of rural residential areas in Fengxian County.Based on the theory of fractal,kernel density and landscape index method,to study the spatial and temporal distribution characteristics of rural residential areas in Fengxian from different scales,and analyze its influencing factors,combining the influencing factors,and building the rural support system accessibility with the traffic road network.Accessibility,taking into account the relationship between the construction of rural public service facilities,rural industrial development planning,and transportation facility planning,and constructing the production and life accessibility of Fengxian’s rural residential areas,and using the rural residential areas’ production and living accessibility as rural residents An important basis for point optimization partitioning and optimization mode,study on the layout optimization of rural residential areas in Feng County.The findings are as follows:(1)Analyze the spatial evolution characteristics of rural residential areas in Fengxian by combining landscape index method models,fractal features,and kernel density models.(1)From the perspective of changes in the density of rural residential areas,in general,the patch density of rural residential areas in the unit area has increased significantly from 1989 to 2019,and the density of residential areas has declined from the center to the periphery.The density of patches in rural residential areas in the area gradually increased,and the fragmentation of the plates decreased.(2)From the change of the number of rural residential areas,the size of rural residential areas has also decreased significantly in the past 30 years.The number of plaques(NP)in residential settlements has decreased year by year,and the average shape index value(MSI)has decreased year by year,and is close to 1.The fragmentation of plaques in rural residential areas has become smaller,and the degree of regularity of plaques is getting higher and higher.(3)From the perspective of changes in the area of rural residential areas,the patch area(CA)of each township(street)in the county has increased year by year.Instability,this result is mainly caused by the government to increase the control of collective construction land,the consolidation of rural residential areas,etc.(2)The analysis of the influencing factors of the distribution of rural residential areas shows that the influencing factors can be summarized as the influencing factors of production accessibility and life accessibility.To this end,with the help of the accessibility model and the analytic hierarchy process,combined with the transportation road network to build the accessibility of rural support systems,comprehensively considering the relationship between the construction of rural public service facilities,rural industrial development planning and transportation facility planning Evaluate the accessibility of production and living in rural residential areas.On the whole,the spatial distribution of production and life accessibility in Fengxian township shows a central radial spatial distribution pattern,with obvious urban center and town center gradually decreasing accessibility to the surrounding areas.Due to Fengxian’s unique location,it is located at the junction of the four provinces of Sulu,Henan and Anhui.In the area that borders with other provinces and cities,the infrastructure is not complete and the traffic accessibility is low,resulting in low accessibility to production and life in Fengxian’s remote areas.(3)In the study of the optimization of the spatial layout of rural residential areas in Fengxian,this article takes the accessibility of production and living in rural residential areas in Fengxian as an important basis for establishing an optimized zoning and which optimization model to use.Based on the evaluation index system,based on the evaluation results and following the principle of optimizing the spatial layout of rural residential areas,the rural residential areas in Fengxian County were optimized for zoning.Combined with the actual situation of Feng County,the different rural residential areas in Feng County are divided into 5 major models:160 internal integration and promotion models,519 comprehensive development optimization models,508 urban and rural overall development models,and 258 new village models(including special protection categories 16).There are 93 ecological relocation models.Finally,on the basis of quantitative analysis results and layout optimization principles,a spatial layout optimization plan for rural residential areas in Feng County was proposed.