国产资源三号测绘卫星DSM数据质量评价--以高海拔山区为例

为了评价国产资源三号测绘卫星DSM数据精度,在顾及地貌类型的情况下,以涵盖平原、台地、丘陵等地貌的高海拔山区为研究案例,并以1∶1万实测地形图DEM为假定真值,以90m分辨率SRTM DEM为评价参照,从高程精度和地形描述精度两个方面,对15m分辨率ZY-3DSM进行精度评价分析。研究结果表明:ZY-3DSM高程精度优于SRTM DEM,前者高程中误差仅为后者的1/6;就地形描述精度来讲,ZY-3DSM与SRTM DEM相比,其地形描述精度更接近理论值,前者RMS Et实际值仅为理论值0.99倍,而后者的实际值却是理论值5.13倍。由此看来,ZY-3DSM数据精度整体上高于SRTM DEM。

Evaluation of DSM data quality on ZY-3 surveying and mapping satellite---a case of high altitude mountain areas

In order to evaluate the accuracy of DSM data of ZY‐3 surveying and mapping satellite ,this paper selects ZY‐3 DSM data in the high altitude mountain areas ,treating the field surveying data DEM and SRTM DEM as reference contrastive data ,and comparing the data accuracy with field surveying data through elevation accuracy and accuracy of terrain representation .The results show the elevation accuracy of ZY‐3 DSM is better than the SRTM DEM ,specifically the former has about 1/6 of mean square error of height compared with the latter .In terms of the accuracy of terrain representation ,ZY‐3 DSM is closer to the theoretical value ,of which RMS Et actual value is 0.99 times ,while the SRTM DEM is 5.13 times . Thus the data accuracy of ZY‐3 DSM is better than the SRTM DEM .