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Spatial Correlation Based Psinsar Technique to Estimate Ground Deformation in las Vegas Region, Us

机译:基于空间相关性的Psinsar技术估算美国拉斯维加斯地区的地面变形

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Differential Synthetic Aperture Radar interferometry (DIn-SAR) is an efficient technique for observing and monitoring ground deformation over a large area at a millimetric level using multi-temporal SAR images. However, the phase decorrelation phenomena along with other bottlenecks, such as atmospheric nuisance, orbital, and DEM inaccuracy limit the accuracy of the traditional DInSAR technique. Persistent Scatterer InSAR (PSInSAR), based on DInSAR, circumvents these limitations using temporally stable reflectors or permanent scatterers (PS) of earth surface using a long temporal stack of SAR images. In this paper, a spatial correlation based PSInSAR technique is applied to detect the ground deformation of Las Vegas, Nevada, US between 2002 to 2010. This aim of this study is focused on the precise estimation and validation of ground deformation using the PSInSAR analysis of descending pass Envisat ASAR data, and further cross-validation of displacement time-series is carried out with GPS time-series observations. Archived C-band Envisat ASAR SAR data stack was used to estimate ground deformation map of the concerned area. A good correlation is observed between PSInSAR and GPS time-series. We have observed a mean annual deformation rates of -5 to 5.1 mm/ year during 2002-2010 along satellite line of sight (LOS).
机译:差分合成孔径雷达干涉法(DIn-SAR)是一种有效的技术,可使用多时相SAR图像在毫米水平上观察和监视大面积的地面变形。但是,相位去相关现象以及其他瓶颈(例如,大气干扰,轨道和DEM不准确度)限制了传统DInSAR技术的准确性。基于DInSAR的InSAR永久散射体InSAR(PSInSAR)使用长时间的SAR图像叠加层,通过使用时间稳定的反射器或地球表面的永久散射体(PS)来规避这些限制。在本文中,基于空间相关的PSInSAR技术被用于检测美国内华达州拉斯维加斯在2002年至2010年之间的地面变形。本研究的目的在于利用PSInSAR分析对地面变形进行精确估计和验证。向下传递Envisat ASAR数据,并使用GPS时间序列观测值对位移时间序列进行进一步的交叉验证。使用存档的C波段Envisat ASAR SAR数据堆栈来估计相关区域的地面变形图。在PSInSAR和GPS时间序列之间观察到良好的相关性。我们观察到2002-2010年沿卫星视线(LOS)的年平均变形率为-5至5.1 mm /年。

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