不同模式Radarsat 影像DEM 提取及精度比较

利用摄影测量方法进行DEM 提取是热带雨林地区雷达应用方向之一。以热带雨林地区平地、丘陵和山地混合地形区为研究对象, 收集了F、S 和W 等不同波束模式的Radarsat-1 SAR 影像9 景, 组合成6 个不同类型的立体像对, 进行DEM 提取, 探讨基于距离ö多普勒构像方程的Radarsat 影像的DEM 提取方法。通过对DEM 结果进行精度验证和比较, 认为提取的DEM 精度受多种因素影响, 同种波束模式的立体配置, 立体交会角越大,DEM 精度越高; 对于地表起伏较小的平地,DEM 精度要高于丘陵山地区, 该研究区DEM 精度的平均误差可以达到14 m 左右,RMSE 可以达到29 m 左右。

Radargrammetry DEM from Different Beam Mode Radarsat Imageries and Accuracy Comparison

It is an application field to extract DEM using radargrammetry method in tropical rainforest area.Digital Elevation Model(DEM) images are generated from nine Radarsat-1 images(F,S and W beam modes) which make up six stereo pair combinations,based on range/Dopple imaging equation.The selected study area is a tropical rainforest area which consists of a mixture of plain,hilly and mountainous terrain.The DEM accuracies for all the stereo combinations have been validated and compared to each other.The results show that numerous factors affect the final DEM accuracy,the higher the stereo intersection angle of the same beam mode,the better the accuracy of the final DEM.In flat areas,the final DEM accuracy is higher than hilly and mountainous areas,and the DEM accuracy can reach to about 14 m(average error) and 29 m(root mean square error) in this study area.