DEM精度在DInSAR监测采空区沉降中的影响

Effect of DEM Precision on Goaf Subsidence Monitoring with DIn SAR

针对不同精度DEM对DIn SAR监测采空区缓慢沉降的影响问题,通过应用三维激光扫描仪、地形图、高相干性Terra SAR影像来获取DEM,分析对比了获取的4种DEM在沟壑斜坡区域的精度,及其参与的"二轨差分"在斜坡区域的形变监测值。结果表明,通过三维激光扫描仪、地形图获取的DEM参与DIn SAR的监测结果对微小形变监测更精确,由Terra SAR影像获取DEM参与的监测结果可靠性较低,应用高精度DEM重采样的SRTM DEM参与的"二轨差分"结果减小。

Aiming at the effect of different DEM precision on the slow subsidence monitoring of goaf with DIn SAR,using3 D laser,terrain,SRTM3 and Terra SAR image,different DEMs were generated. The precision of the DEMs on gully region were compared,and the influence of the precision on DIn SAR result was analyzed. The data shows that,results of the DIn SAR with DEMs generated by 3D laser and terrain are precise for slow subsidence monitoring,however,that by Terra SAR images was not reliable, the result of 2- track difference decreases, with SRTM DEM resampled by high precision DEM.