基于SAR时间序列的建设用地扩展监测——以常州市新北区为例  

Expansion monitoring of construction land based on SAR time series:A case study of Xinbei District,Changzhou

作　　者：孙超[1,2] 陈振杰 王贝贝[1,2] SUN Chao;CHEN Zhenjie;WANG Beibei(School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China;Key Laboratory for Satellite Mapping Technology and Applications of National Administration of Surveying, Mapping and Geoinformation, Nanjing 210023, China)

机构地区：[1]南京大学地理与海洋科学学院,南京210023 [2]卫星测绘技术与应用国家测绘地理信息局重点实验室,南京210023

出　　处：《国土资源遥感》2020年第4期154-162,共9页Remote Sensing for Land & Resources

基　　金：国家重点研发计划项目“国土资源与生态环境安全监测技术集成平台”(编号:2017YFB0504205);国家自然科学基金面上项目“基于遥感影像序列的土地利用变化模式识别方法研究”(编号:41571378)共同资助。

摘　　要：随着城市化进程的不断加快,城市范围不断扩展,快速、准确掌握建设用地的变化对于城市的可持续发展至关重要。合成孔径雷达(synthetic aperture Radar,SAR)影像由于不受天气影响可以及时获取对地观测影像,使得基于SAR时间序列的建设用地扩展监测成为可能。SAR时间序列在发生建设用地扩展过程中存在2种时间序列形态结构,本文命名为“Z”形结构和“V”形结构,针对以往研究中只考虑“Z”形结构未考虑“V”形结构的情况,本研究提出一种基于时间序列自适应分段的建设用地扩展监测方法。对原始时间序列进行自适应分段,使用分段平均值作为特征值,最后使用决策树提取建设用地扩展区域。经验证,方法的正确率为89.60%,完整率为92.73%。研究表明:本文提出的方法能有效地监测建设用地扩展,相对于动态时间弯曲(dynamic time warping,DTW)方法,正确率提高1.80百分点,完整率提高1.27百分点;常州市新北区在2015—2019年间,建设用地共增加557.96 hm^2,主要扩展方向为南和东南方向。With the acceleration of urbanization process,the size of the city is growing,and hence it is of great importance to grasp the change of construction land quickly and accurately for the sustainable development of cities.Because SAR images are not affected by the weather,it is possible to use SAR time series to study the expansion of construction land.There are two kinds of time series structures in SAR,which are named“Z”structure and“V”structure in this paper.In view of the previous studies that only consider the“Z”structure but not the“V”structure,this study proposes a construction land extension method based on time series adaptive segmentation.The original time series is segmented in an adaptive manner,the average value of the segments is used as the characteristic value,and the extended area of construction land is extracted by the decision tree.The accuracy and completeness of the method are 89.60%and 92.73%respectively.The results are as follows:①The method proposed in this paper can effectively monitor the expansion of construction land.Compared with that of the dynamic time warping(DTW)method,the accuracy is increased by 1.80 percentage points and the integrity rate is increased by 1.27 percentage points.②From 2015 to 2019,construction land in Xinbei District of Changzhou increased by 557.96 hectares,mainly in the south and the southeast.

关 键 词：建设用地扩展 SAR时间序列 Sentinel-1A 时间序列分割 序列形态结构 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]