Estimating Strain and Rotation From Wrapped SAR Interferograms

Abstract

This letter aims to discuss a general framework that allows the direct interpretation of the wrapped DInSAR phase in terms of surface strain S and rotation R components. The methodology is demonstrated showing the estimation of strain and rotation components of a glacier flow using three TerraSAR-X interferometric geometries (ascending right-looking, descending right-looking and descending left-looking. Finally since the left looking geometry can be difficult to obtain on a regular basis, the surface parallel flow assumption is extended to the phase gradients inversion in order to reduce the amount of necessary geometries from three to two.

Potential of an Automatic Grounding Zone Characterization Using Wrapped InSAR Phase

“…where A is the product of master and slave reflectivity and δ s = δ T s is the projection of the displacement vector δ along the line of sight s (LoS). Equation 1shows how, under the linear approximation hypothesis, the deformation gradients are basically a scaling of the interferogram fringe frequencies [7]. Therefore the gradient measurements ∇δ s can be hence estimated from the single look complex data performing a frequency estimation [8], [9].…”

Inversion of the Slip Distribution of an Earthquake From InSAR Phase Gradients: Examples Using Izmit Case Study

“…For the sake of simplicity, the notation has been shortened to u i j = ∂δ i /∂ j . Hence, the displacement gradients observed in the sensing direction of the radar can be written as [9] ∇(δ T s)…”