摘要
以具有复杂地形特征的沿海低山丘陵区为试验区,基于Sentinel-1A影像及InSAR技术提取DEM数据,对其精度进行定量评价,并分析高程异差值与坡度、坡向之间的关系。结果显示,Sentinel DEM与SRTM DEM空间分辨率相当,能够较好地分辨出地形起伏的纹理特征;随着坡度增大,Sentinel DEM垂直精度降低;试验区中背对卫星拍摄方向的高程异差值比正对拍摄的要大。试验表明,利用Sentinel-1A数据反演复杂地形区域DEM的方法是可行的,能够为特定区域的大面积地形测量提供技术支持。
As an important technical means to obtain DEM,InSAR has the characteristics of wide coverage,high resolution and working all day.Taking coastal low hilly area with complex topographical features for example,this paper introduces the DEM extraction process based on Sentinel-1 A images and InSAR technology,evaluates the accuracy of the obtained DEM,and quantitatively analyzes the relationship between elevation difference values(D-value)and slope,aspect and land use classes.The results show that Sentinel DEM has the same spatial resolution with SRTM DEM,in which the terrain texture feature can be clearly distinguished.As the slope increases,the vertical accuracy of Sentinel DEM decreases.The D-value of north aspect is larger than other aspects.The study can prove that the method of using Sentinel-1 A data to obtain DEM in complex terrain area is effective,providing technical support for large-scale area topographic surveys,which has strong practical significance.
作者
李东
侯西勇
LI Dong;HOU Xiyong(Yantai Institute of Coastal Zone Research,Chinese Academy of Sciences,Yantai 264003,China;CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation,Yantai 264003,China;Center for Ocean Mega-Science,Chinese Academy of Sciences,Qingdao 266071,China)
出处
《测绘通报》
CSCD
北大核心
2021年第S01期61-64,共4页
Bulletin of Surveying and Mapping
基金
山东省自然科学基金(ZR2020QD090)
中国科学院战略性先导科技专项(XDA19060205,XDA19090123)
作者简介
李东(1985—),男,博士,助理研究员,研究方向为海岸带资源环境遥感监测与分析。E-mail:dli@yic.ac.cn;通信作者:侯西勇。E-mail:xyhou@yic.ac.cn
