摘要
城镇是人类社会发展过程在空间上的重要表现形式,其空间格局与演变是城镇研究的热点问题。淮河流域是中国城镇体系的南北过渡地区,研究这一自然地理单元内城镇扩张过程,视角独特。为客观、快速、准确地重建不同时间序列上淮河流域城镇扩张过程,在DMSP/OLS数据、SPOT-VGT数据、Landsat ETM+数据等多源遥感数据的基础上,提出"DMSP/OLS夜间灯光数据相互校正—NDVI数据重建—流域城镇信息提取—流域城镇扩张分析"的研究思路,并运用该思路分析淮河流域从1998年至2013年16年间的城镇扩张过程。从城市面积、扩张强度、扩张动态度、扩张形态4方面分析了城市扩张规律。研究发现:淮河流域整体与各省扩张基本属于低速扩张型与中速扩张型;淮河流域城镇分布仍较为分散,未形成完整的城市群或城镇体系;这一时期城市扩张时空发展不均衡。
In order to grasp the urban expansion process in different temporal sequences objectively, rapidly and accurately, DMSP/OLS data, SPOT-VGT data, Landsat ETM ＋ data, DEM Data and social and economic statistics data were used to rebuild the urban expansion process. Two methods were selected to extract urban areas in Huaihe River Basin （HRB） , one was threshold value method, the other was support vector machine （SVM） classification method. The results of two methods were compared with urban areas extracted from Landsat ETM ＋ data and the result of SVM classification method which accuracy above 80% was proved to be more precise both in spatial form and accuracy estimation of urban areas. The urban areas in HRB for the year 1998, 2001, 2004, 2007, 2010 and 2013 were extracted using SVM classification method. And there were four features of the extracted urban areas calculated and analyzed to understand the dynamism of urban areas in HRB, including the extended area, urbanization intensive index （Un）, extended dynamic degree and spatial pattern. The extended urban areas from 2001 to 2013 of HRB approximately showed a linear growth. Un illustrated that there were still a large number of rural areas to be developed in HRB. The extended dynamic degree stated expanded in a medium speed. The spatial pattern and the spatial metric revealed that city in HRB and the density of cities was not very high. that the urban areas there was no central
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2016年第11期252-261,共10页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家自然科学基金项目(41401171)
教育部人文社科基金项目(14YJCZH028)
关键词
多源遥感数据
城镇扩张
淮河流域
支持向量机
multi-source remote sensing data
urban expansion
Huaihe River Basin
support vector machine
