利用雷达摄影测量方法提取DEM及其精度评价  

DEM Generation and Accuracy Assessment Using Radargrammetry

作　　者：邓磊[1] 陈悦竹[2] 陈云浩[1] 胡德勇[1] 李京[1] 

机构地区：[1]北京师范大学资源学院资源技术与工程研究所,北京100875 [2]中华测绘技术服务公司,北京100088

出　　处：《遥感信息》2006年第4期37-40,插页2,共5页Remote Sensing Information

基　　金：高等学校博士点专项科研基金(20030027014);三维信息获取与应用教育部重点实验室开放基金联合资助

摘　　要：为了解雷达立体摄影测量中各项因素对最终DEM精度的影响,采用马来西亚热带雨林地区具有不同波束模式和入射角的6对Radarsat-1影像,应用两种不同的SAR成像模型,即距离/多普勒模型和等效共线方程模型,对使用雷达摄影测量方法提取DEM进行了试验。首先分析了两种成像模型不同的物理基础,然后通过比较由它们得到的DEM的精度,发现利用距离/多普勒模型提取DEM的精度优于等效共线方程模型;然后,利用研究区的数字地形图等参考资料,分析了不同轨道、不同模式、不同分辨率、不同交角的立体像对组合以及地形因素对DEM精度的影响,要得到高精度的DEM,必须综合考虑立体像对的选取和研究区的地形、地貌等特征。To understand the relationship between DEM accuracy and some major factors in radargrammetry,six pairs of Radarsat-1 image with different beam modes and incident angles in tropical forest area of Malaysia,and two kinds of method based on different SAR imaging models,Range-Doppler and Co-linearity condition equations were used to generate DEM.Firstly,the physical basis of these two models were explained,and then,the accuracies of the DEM generated by them were compared.The former is more suitable for DEM generation;then,some reference data,such as digital contour,were employed to perform DEM accuracy assessment in detail,and the relationship between the DEM accuracy and some important factors,such as orbit,beam mode,spatial resolution,the intersection angle and the impact of terrain were analyzed.To achieve a high accuracy of DEM by radargrammetry,both the stereo pair should be selected carefully and the terrain characteristics should be taken into account.

关 键 词：雷达摄影测量 RADARSAT 合成孔径雷达图像 DEM 精度评价 

分 类 号：P237.9[天文地球—摄影测量与遥感]