基于兴趣点密度与城市扩张曲线的城市建成区边界识别  

Identifying the boundary of Urban built-up area Based on Density of POI and Urban Expansion Curve

作　　者：王方民 骆畅[2] 杨朝现[3] 刘勇 WANG Fangmin;LUO Chang;YANG Chaoxian;LIU Yong(Chongqing Geographic Information and Remote Sensing Application Center,Chongqing 401147,China;College of Horticulture and Landscape Architecture,Southwest University,Chongqing 400715,China;College of Resources and Environment,Southwest University,Chongqing 400715,China;School of Construction Management and Real Estate,Chongqing University,Chongqing 400045,China)

机构地区：[1]重庆市地理信息与遥感应用中心,401147 [2]西南大学园艺园林学院,重庆400715 [3]西南大学资源环境学院,400715 [4]重庆大学建设管理与房地产学院,重庆400045

出　　处：《西南大学学报（自然科学版）》2021年第12期115-126,共12页Journal of Southwest University(Natural Science Edition)

基　　金：国家自然科学基金项目(41771534).

摘　　要：城市建成区的确定是城市规划的重要基础.为客观准确地识别城市建成区,研究比较了基于兴趣点数据的Density-Graph法、基于地理实体数据的城市扩张曲线法两种识别方法,并结合两种方法提出一种兴趣点密度与城市扩张曲线结合的城市建成区识别方法,以重庆市二环区域进行了实证研究.结果表明:(1)Density-Graph法识别城市建成区阈值受容许值的影响,同一研究区在不同容许值下确定的阈值不同,容许值仍依靠经验设置.(2)基于地理实体数据的城市扩张曲线识别城市建成区,能客观地确定阈值,但识别结果受最小扩张单元的影响,对数据要求高,更适用于城市形态分布均匀的区域.(3)基于兴趣点密度与城市扩张曲线结合的城市建成区识别方法,同时兼顾了城市属性与形态特征,能够客观地确定城乡分界阈值,识别面积精度为86.95%,空间重叠度为89.63%,识别结果具有准确性,可为城市建成区识别提供新思路.The determination of urban built-up areas is an important basis for urban planning.In order to identify urban built-up areas objectively and accurately,this study compared the Density-Graph method based on point of interest(POI)data,and the urban expansion curve method based on geographic entity data,combining the two methods,a new method of urban boundary identification combining the point of interest density and the urban expansion curve was proposed.The curve-combined urban boundary identification method was empirically studied in the second ring area of Chongqing.The results showed that:(1)The threshold of the Density-Graph method for identification of city boundary was affected by the allowable value.The thresholds determined under different allowable values in the same study area were different,and the setting of allowable value was still depended on the experience.(2)The urban expansion curve based on geographic entity data can identify the urban boundary,which objectively determined the threshold,but the result of identification was affected by the smallest expansion unit,and data demanding.It was more suitable for areas with uniform urban morphology.(3)The urban boundary recognition method based on the combination of the density of interest points and the urban expansion curve,taking into account of the city attributes and morphological characteristics,can objectively determine the urban boundary threshold,the accuracy of identification area is 86.95%,and the spatial overlap is 89.63%.The results of recognition are accurate and can provide new ideas for the recognition of urban built-up areas.

关 键 词：城市建成区 兴趣点 城市扩张曲线 曲率变点 

分 类 号：P237[天文地球—摄影测量与遥感]