A New Method for Resolving High-Precision 3-D Deformation from Multi-Track InSAR

The combination of the LOS and azimuth measurements at ascending and descending orbits could improve the three-dimensional (3-D) deformation precision, with the accuracy dependent on the magnitude of stochastic error within InSAR measurements. Accordingly, we present the simulations by using a new 3-D deformation inversion method called CovRM-InSAR. In the case study, we applied four InSAR measurements with varying standard deviation (SD) in the LOS and azimuth directions from two tracks to map 3-D deformation. The results show that it is beneficial for improving the east and north deformation whether considering the correlation between azimuth measurements in the covariance matrix. The precision of 3-D deformation resolved by CovRM-InSAR has close accuracy in the vertical and north directions and improved by up to 88% in the east direction when compared with the least square (LS).