WRAPPED INTERFEROGRAMS ENHANCED BY MULSAR METHOD: APPLICATIONS AND COMPARISON TO OTHER METHODS

摘要

SAR interferometry (InSAR) is a powerful technique tornmonitor surface displacements. However, InSAR suffersrnfrom numerous noise sources such as temporal andrngeometric decorrelation of images.rnIn this study, we apply the MuLSAR method [1] tornproduce robust denoised wrapped phase time seriesrnfrom the combination of wrapped interferograms, usingrnthe redundancy of interferograms. It is particularlyrnefficient in high temporal decorrelation areas. Ourrnmethod has been applied to ENVISAT time seriesrnsuffering from diverse temporal decorrelation in threernregions: the Himalaya, the Levantine Fault in Lebanonrnand Western Pakistan. The interferograms arernefficiently enhanced for every time serie.rnFirst, we show that a criterion called colinearity is morernefficient than the coherence to quantify wrapped phasernquality. The performance of MuLSAR method isrndemonstrated as it enhances post-processing stepsrn(DEM residual compensation, unwrapping). It is finallyrncompared to another method of wrapped time seriesrnenhancement, SqueeSAR [2].