Phase unwrapping is one of the critical step in the feasibility of InSAR processes. It consists in retrieving the absolute phase from modulo 2π. Through this paper, we propose a method of phase unwrapping that combines /fusions the advantages of two methods, namely: The method of phase unwrapping by avoidance of discontinuities, based on creating cut lines and the second method, it is based on local/regional propagation of phase unwrapping by referring to quality maps. The idea is that the quality value between the two target edges of the cut-line is set at zero in the quality maps, then the progress of the unwrapping is performed according to the process of the second method where unwrapping phase by referring to edge quality map. To validate the results, the method has been tested using real interferogram.
The differential interferometry PSI is based on the identification of targets exhibiting good phase stability PS. These targets are available in urban areas, but less available in non-urban areas. For this purpose, the statistically homogeneous pixels DS, permit to this technique to be extended for the non-urban areas. Knowing that homogeneous areas are favourable for a development of the speckle noise, an adaptive filtering is applied to these areas without compromising the phase stability of PS. In this context, we propose in this paper a PS and DS selection strategy based on two steps: first, the PS are selected and isolated using coherence maps, which will allow us to exclude theme from filtering operation. In the second step, the DS selection is processed. This approach has been tested on SAR images acquired by sensors ERS1/2 corresponding to the area of Haoud el Barkaoui, Ouargla in Algeria.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.