径向基函数插值的InSAR DEM更新及精度评定  

InSAR DEM updating and accuracy evaluation of radial basis function interpolation

作　　者：孟欣 王赛 陈刚[1,2] 钱方明 MENG Xin;WANG Sai;CHEN Gang;QIAN Fangming(Xi'an Research Institute of Surveying and Mapping,Xi'an 710054,China;State Key Laboratory of Geo-Information Engineering,Xi’an 710054,China)

机构地区：[1]西安测绘研究所,陕西西安710054 [2]地理空间信息国家重点实验室,陕西西安710054

出　　处：《测绘科学与工程》2021年第3期30-34,共5页Geomatics Science and Engineering

摘　　要：DEM是地球空间信息科学的基础数据,InSAR技术作为新型对地观测技术,在构建高精度DEM方面展现巨大潜力及优势。但由于观测模式和侧视成像的影响,仍存在一些固有误差。本文基于天绘二号卫星编队构型的特点,采用地形数据更新的方式,优化InSAR数据处理过程和参敎,并对生成的DEM作径向基函敎插值处理,最后采用SRTM1 DEM、ASTER GDEM和机载高程数据对插值后的DEM进行点、线、面精度分析。实验结果表明:插值后的DEM高程误差整体质量较好,与实际地形相符,在平地区域其高程精度可达2.5m,符合我国1:25000 DEM国家标准和美国HRTI-3标准,表明了天绘二号卫星构建高精度DEM的可靠性。Digital elevation model(DEM)provides basic data of geospatial information science.As a new earth observation technology,InSAR has great potential and advantages in high-precision DEM construction.However,due to the influence of observation mode and side-wide imaging,there are still some inherent errors.In this paper,based on the formation configuration characteristics of TH-2 satellite,the InSAR data processing and parameters are optimized by updating terrain data and the radial basis function(RBF)interpolation method is employed to process the generated DEM.Finally,the point,line and plane accuracy of the interpolated DEM were analyzed by using SRTM1 DEM,ASTER GDEM and airborne elevation data.The experimental results show that the interpolated DEM elevation error is small and consistent with the actual terrain.In urban areas,the elevation accuracy can reach 2.5 meters,which meets the national standard of 1:25000 DEM and the U.S.standard of HRTI-3,proving the feasibility of constructing high-precision DEM with TH-2 satellite.

关 键 词：敎字高程模型 合成孔径雷达干涉技术 径向基函数 天绘二号 卫星编队 

分 类 号：P237[天文地球—摄影测量与遥感]