15 years of SAR Interferometry

Since the end of the 1980s a technique based on the use of Synthetic Aperture Radar (SAR) data from Earth-orbiting instruments has been developed. The approach, known as SAR Interferometry (InSAR) is able to provide accurate measurements of the Earth's surface deformations due to geological and geophysical phenomena, as earthquakes, landslides and volcanic eruptions. In less than two decades the InSAR technique has spread through a wide range of Earth Science fields. During these years a huge amount of applications were made and a vast number of theoretical and applicative manuscripts are available in literature today. Recent improvements in InSAR lead to the development of a new approach, referred to as Advanced InSAR (A-InSAR) techniques, which are addressed to the monitoring of slow movements in time. This work does not attempt to be a comprehensive review of the theory and applications of InSAR and A-InSAR, but it would like to provide a basic overview of these techniques.