摘要:
为评价资源三号测绘卫星(ZY-3)DEM数据在地质领域的应用效果,结合ZY-3卫星的在轨测试工作,选择内蒙古大青山山前断裂为实验区,从数据精度和可用性2个方面对ZY-3 DEM数据在活动构造定量研究中的应用进行评估。参考1∶5万比例尺DEM和实验区野外实测高精度GPS数据,对比ASTER传感器立体像对生产的30 m分辨率GDEM数据,采用检查点法和剖面法对ZY-3立体像对生产的5 m分辨率DEM数据进行了精度评价。实验结果表明:ZY-3 DEM的高程精度略优于ASTER GDEM;ZY-3 DEM受地表形态因素影响更为显著。通过对大青山山前断裂呼和浩特段的地貌特征进行遥感数据统计分析与微地貌研究发现,该区域以中、低陡坡为主(约占该段山体的92%),发育有4级夷平面和1级山前沉积台地,越靠近东部断裂末段,断裂的活动性越弱;断裂呈线性展布,其活动性以张性为主,兼具左行水平滑移。研究结果表明,ZY-3提供的高分辨率光学影像、多光谱影像和DEM可有效地应用于活动构造的定量研究。
Abstract:
In order to evaluate the data usability of ZY -3 in geology, the authors chose piedmont fault of the Daqing Mountain as the study area, and assessed the effect of applying the DEM( digital elevation model) of ZY-3 to quantitative study of active structure on the basis of the on-orbit testing work. Consulting 1:50 000 DEM and high-precision GPS data, the authors assessed the DEM of ZY-3 which has 5m resolution by the check-point method and profile method, in comparison with the GDEM of ASTER which has 30 m resolution. Experimental results show that the elevation accuracy of ZY-3 DEM is slightly better than that of ASTER GDEM,and ZY-3 DEM is affected by the terrain factors more significantly than ASTER GDEM. Statistic analysis and micro -topographic research were carried out on piedmont fault of the Daqing Mountain, and the results obtained show that mountain areas account for about 92% of this region, and most of them are low or medium mountains. This region has four planation surfaces and a piedmont deposition platform, the closer to the last part of the eastern fault, the weaker the activity is. Fractures are distributed in linear form and their activities are mainly in tension with left-level slip. The high resolution optical images, multispectral resolution images and DEM can be widely used in quantitative study of active structures.
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