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不同外部DEM和多视对矿区形变探测的影响
供稿: 成晓倩；马超；马威 时间: 2018-03-29 次数:

作者：成晓倩；马超；马威

第一作者单位：河南理工大学测绘与国土信息工程学院；河南理工大学矿山空间信息技术国家测绘地理信息局重点实验室

摘要：探讨高分辨SAR影像利用二轨法DInSAR技术对高强度开采矿区形变的监测能力。多视SAR和外部DEM是二轨法DInSAR的两个核心信息源,其数据质量直接影响差分干涉结果,从而影响形变监测能力。采用不同的外部DEM(SRTM DEM,ASTER GDEM)及不同多视对高分辨率RADARSAT-2的4组干涉像对进行处理,结合矿区工作面图对DInSAR获取的沉降结果进行剖面分析,利用Orign8.5对剖面沉降曲线及沉降盆地边缘分别进行曲线拟合,从而探讨不同外部DEM和多视对矿区形变监测结果的影响。结果表明:(1)在SAR相干性较好的前提下,2种外部DEM均能很好地监测到矿区开采沉陷形变区,下沉剖面形变曲线趋势一致,符合开采沉陷规律。(2)对于高分辨SAR影像,多视视数相同时,SRTM DEM和ASTER GDEM作为外部DEM提取的形变结果一致,这是由于两者平面精度相对于SAR影像精度而言相差甚远(3) 外部DEM相同时, 多视对差分结果影响较大, 多视视数增加后, 在平滑噪声的同时也降低了对细节的探测能力。由此可知利用高分辨SAR影像对高强度开采矿区进行形变监测, 应选择与影像精度在一个个数量级的外部DEM, 充分利用SAR的高分辨率优势, 而且应当选择较小的多视视数保证细节信息。

Abstract：By using two-pass DInSAR technology, the ability of surface deformation was discussed based on high resolution SAR image. Multi look SAR and external DEM are key information sources of the two-pass DInSAR. Therefore, the quality of data affects the differential interference directly. Four interferometric image pairs of high resolution RDARSAT-2 with different external DEM (SRTM DEM, ASTER GDEM) and multiviews were used to investigate the influence of different external DEM and multi-view on deformation detection in mining area. Combined with the working face, the deformation was obtained by DInSAR and were analyzed along the profile. In order to explore the influence of the different external DEM and multi-view, the profile curve of deformation and the edge of the basin were fitted by Orign8. 5 software. The results show that (1) in the condition of good coherence, both two external DEM can obtain the mining subsidence deformation areas and the deformation curve of subsidence profile is consistent with the mining subsidence. (2) SRTM DEM and ASTER GDEM obtain the similar deformations with the same multi-view of high resolution SAR images, which is because the large difference of resolution exists in DEM and SAR image. (3) multi-view affects the differential interference greatly with the same external DEM. The increasing multi-view smooth the noises, However, the detection ability of details are reduced. Therefore, selecting small multi-view maintains the advantage of high resolution SAR and improves the monitoring capacity of DInSAR in mining deformation detection. A higher resolution of external DEM should be selected in order to make full use of the high resolution information of SAR and smaller multi-view to ensure the details.

关键词：DInSAR;多视;SRTM DEM;ASTER GDEM;高分SAR;矿区形变;

DOI：10.16186/j.cnki.1673-9787.2018.02.008

分类号：TD325.4

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