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利用干涉合成孔径雷达测量技术（INSAR）获取了3个典型区域的数字高程模型（DEM）的基础上,结合我国1:25万数字高程模型,对所获取的DEM进行比较和分析,得出了INSAR技术的适用范围和测量精度.结果表明:在植被稀少、地表干燥的平原、山脉和丘陵地区,图像对相关性较好,高程误差为4～6m,所获取的DEM明显优于1:25万DEM;在植被茂密地区,图像对相关性较差,高程误差在30m左右,其精度不如1:25万DEM;在植被较薄（灌木）的地区,利用Tandem干涉对,也可获得10m左右的测量精度;在湖面、河面等水面区域,由于出现无信号的热噪区域,将产生较大的局部误差.研究表明利用星载INSAR技术在植被稀少、自然条件复杂的我国西部地区开展地形测绘工作是完全可行的.
Based on the DEM (Digital Elevation Model) of three typical regions using INSAR (Inverted Synthetic Aperture Radar) technique and the 1: 250,000 digital elevation model in China, the DEM obtained is compared and analyzed INSAR technology and the accuracy of measurement.The results show that in the plain, mountainous and hilly regions where the vegetation is scarce and the surface is dry, the correlation between the images is good, the elevation error is 4 ~ 6m, the obtained DEM is obviously better than 1:25 In the dense vegetation area, the correlation between the images is poor, the elevation error is about 30m, and the accuracy is lower than 1: 250000 DEM. In the areas with thinner vegetation (shrubs), Tandem interference pairs can also obtain about 10m The accuracy of the measurement will be high.With the no-signal thermal noise region, there will be a large local error in the water surface area such as the lake surface and the river surface.The research shows that the satellite INSAR technology is applied in the terrain mapping in the western part of our country where the vegetation is rare and the natural conditions are complex Work is entirely feasible.