摘要
多中心组团发展是优化区域空间结构的重要路径,由此带来的城市空间扩展模式包含邻接型与跳跃式,亟需研究顾及城市空间多模式扩展的模拟技术。既有研究难以较好实现跳跃式斑块的模拟,主要存在无法展现城市增长过程或选取的“扩展种子点”随机性过大或模型适用尺度较小等问题。本文提出了一种耦合最大熵模型(MaxEnt)与近邻传播聚类(AP)的MaxEnt-AP-CA模型:利用MaxEnt模型寻找跳跃式扩展备选区域并进行筛选,减小了种子点的搜寻范围,降低了随机性和运算数据量,适用于更大尺度;结合AP算法得到种子点,展现跳跃式斑块的增长过程;引入“生长系数”实现多模式扩展的同步模拟。以重庆市主城都市区为研究区,使用MaxEnt-AP-CA模拟了2010—2020年城市用地的扩展情况,研究发现:(1)MaxEnt-AP所求种子点命中实际跳跃式斑块的准确性显著提高;(2)在精度指标上,最优参数下,MaxEnt-AP-CA的FoM峰值达到0.3061,精度相比传统CA模型具有明显提高;景观形态上,MaxEnt-AP-CA在斑块规模、破碎度、聚集度上与实际情况更为接近,且能保留更多的斑块形状特征,最优模拟结果与实际城市的总体相似性为87.04%;局部细节特征上,MaxEnt-AP-CA可精准展现跳跃式增长斑块,能更准确地表达城市的真实扩展情况;(3)MaxEnt-AP-CA可兼顾多模式扩展模拟,契合我国城市发展现状,有助于推动构建新型城镇化格局。
Development of multi-center clusters is an important way to optimize regional spatial structure,which results in various forms of urban space expansion,such as the adjacent type and the outlying type.Therefore,it is urgent to investigate the simulation techniques that takes into account the multi-mode expansion of urban space.However,it is still difficult to achieve the simulation of the outlying expansion in existing research,mainly due to the following problems:limited ability to show the urban growth process,large randomness of the selected"expansion seed points",and small application scale of models,etc.In this paper,a MaxEnt-AP-CA model coupling Maximum Entropy model(MaxEnt)and Affinity Propagation clustering(AP)is proposed.The MaxEnt model is used to find the alternative area of the outlying expansion,and the area and the compaction indices are used to screen the alternative area.In this way,the searching range of seed points is reduced,the randomness and the amount of data to be calculated are reduced,and the model is suitable for larger scale research.The AP algorithm is used to search for seed points in the alternative area,and these seed points grow outward from a basic size.Then the growth process of the outlying patch is demonstrated.Finally,by introducing the"growth coefficient",the conversion probabilities of different expansion modes are fused to realize the synchronous simulation of multi-mode expansion including the adjacent type and the outlying type.Taking the main metropolitan area of Chongqing as the research area,the Maxent-AP-CA is used to simulate the urban land expansion from 2010 to 2020.The results show that:(1)The accuracy of the seed points obtained by MaxEnt-AP that hit the actual outlying patch is significantly improved;(2)In terms of accuracy,the peak FoM of MaxEnt-AP-CA reaches 0.3061 with optimal parameters,which significantly improves the accuracy compared with the traditional CA model.In terms of landscape morphology,MaxEnt-AP-CA is closer to the actual situation in patch size,fragmentation degree,and aggregation degree,and can retain more patch shape features.The overall similarity between the optimal simulation results and the actual urban area is 87.04%.In terms of local details,MaxEnt-AP-CA can accurately show the outlying patches and express the real urban expansion more accurately;(3)MaxEnt-AP-CA gives consideration to multi-mode expansion,which conforms to the current situation of urban development in China and helps to promote the construction of a new urbanization pattern.
作者
李启源
王海军
周智勇
马红
柴洁
LI Qiyuan;WANG Haijun;ZHOU Zhiyong;MAHong;CHAI Jie(School of Resource and Environmental Science,Wuhan University,Wuhan 430079,China;Key Laboratory of Monitoring,Evaluation and Early Warning of Territorial Spatial Planning Implementation,Ministry of Natural Resources,Chongqing 401147,China;Chongqing Survey Institute,Basic surveying department,Chongqing 401120,China;Technology Innovation Center for Spatio-temporal Information and Equipment of Intelligent City,Ministry of Natural Resources,Chongqing 401120,China)
出处
《地球信息科学学报》
EI
CSCD
北大核心
2023年第7期1464-1480,共17页
Journal of Geo-information Science
基金
国土空间规划监测评估预警重点实验室开放基金资助项目(LMEE-KF2021006)
国家自然科学基金项目(42171411)。
关键词
跳跃式扩展
多模式扩展
最大熵
近邻传播聚类
元胞自动机
地理模拟
城市扩展
多中心发展
重庆市
outlying expansion
multi-mode expansion
maximum entropy
affinity propagation
cellular automata
geographic simulation
urban growth
multi-center development
Chongqing
