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Differential Synthetic Aperture Radar Interferometry is a technique that, by making the phase difference of<br>SAR image pairs, allows to extract the information relevant to the earth surface displacements.<br>The result of the phase difference, referred to as Interferometric Phase or Interferogram, contains different<br>terms: the deformation phase term, a topographic phase contribution, an atmospheric phase term and the<br>noise contibution.