利用资源三号卫星DSM提取的山体特征线精度分析

Accuracy Analysis of Terrain Feature Lines Extracted from DSM of ZY-3 Satellite

利用资源三号卫星(ZY-3)DSM和SRTM DEM资料分别提取山体特征线,并以实测地形图为参照,从吻合度和点位精度两方面对自动提取的数据进行精度比较。结果表明,基于ZY-3DSM提取的山体特征线比SRTM DEM具有更高的一致性,且前者比后者的吻合度高约9%;就同名点位精度而言,89%的ZY-3DSM山体特征线落入2.25mm限差内,而SRTM DEM仅有7%符合测量精度规范。总体而言,与SRTM DEM相比,基于资源三号卫星ZY-3DSM提取的山体特征线栅格数更多,精度更高。

Using ZY-3 satellite（ZY-3）DSM and SRTM DEM data,we extract terrain feature lines alternatively,and compare their accuracy with the field surveying data through the goodness of fit and positional accuracy.Results show that,compared with SRTM DEM,the terrain feature lines from ZY-3DSM are more consistency as well as the higher goodness of fit at 9%.In terms of the positional accuracy of the homonymy points,89%terrain feature lines of ZY-3DSM meets the request of surveying accuracy,compared with only 7% of SRTM DEM.Consequently,the terrain lines extracted from ZY-3DSM have the higher accuracy.