A Function Model for Predicting the Detectable Deformation Gradient by D-insar

In this paper, a new function model for determining the minimum and maximum detectable deformation gradient in synthetic aperture radar interferometry (InSAR) with Envisat ASAR images is developed. The model incorporates the parameters of both interferometric coherence and multilook operator for 1, 5 and 20, rather than the interferometric coherence only in previous studies. Experimental results with real data sets show that the new model performs very well for interferograms with different look numbers and interferometric coherences. The model is thus an essential extension of the previous model constructed. Nevertheless the simplicity of the modeling processes involved, the model can serve as a preliminary tool to judge whether the InSAR technology can be used to monitor a given ground deformation. In addition, it can possibly reveal which look number will result in better monitoring of a ground deformation in the InSAR data processing.