SAR interferometry on a very long time scale: a study of the interferometric characteristics of man-made features

Abstract

Abstract-Anthropogenic features show up as highly coherent objects even in heavily decorrelated interferograms. In order to assess whether the information from such features is still usable, the stability of their phase and coherence is analyzed through a series of interferograms. The results indicate that these features can remain interferometrically stable over several years.Index Terms-Coherence, differential SAR interferometry, man-made features.

Ground surface dynamics in the northern Adriatic coastland over the last two decades

“…The measurements were initially carried out by the DInSAR approach, which has been used in geophysical sciences since the late 1980s (Gabriel et al 1989), and more recently by IPTA, a refined approach developed about 10 years later and included within the so-called persistent scatterer interferometry (PSI) approach (Usai and Klees 1999;Ferretti et al 2001;Werner et al 2003). DInSAR and IPTA have shown an impressive capability to measure land subsidence with a millimetric accuracy at an unprecedented level of spatial detail (Crosetto et al 2008).…”

Fast damage mapping in case of earthquakes using multitemporal SAR data

“…The first one is a trained approach [2], requiring at least some rough estimate of the damages on the ground, which usually are known after a few days from the event, and come from visual interpretation of optical images and manual fusion of multiple information sources. The second approach is instead an unsupervised method [16], suitable for a faster but less precise analysis, which might be the case in other situations or for attempting analyzes in areas where no ground assessment of the damages is available.…”

“…While the main goal of the International Charter is to provide satellite imagery, a number of institutes and projects (whether in the context of Charter activations or not) are involved in the production and the distribution of thematic maps showing the extent of the damages (UNOSAT (http://unosat.web.cern.ch/unosat/), RESPOND (http://www.respond-int.org/respondlive/), RISK-EOS (http://www.risk-eos.com/), DLR-ZKI (http://www. zki.caf.dlr.de/), and SERTIT [2]). Since all the maps providers need to deliver their products quickly, and being the pre-processing steps time consuming, often the mapping is performed manually, in order to avoid too long processing times.…”

“…The two research approaches available in literature are related to two different types of changes. The first approach is related to the amount of decorrelation due to the changed orientation of the strong scatterers, which causes the decrease of the interferometric coherence to a lower level [2]. The second one is focused on changes in intensity values, again on the basis of a difference in the backscattering behavior caused by some geometric changes in the wave-structure interactions.…”

Monitoring of Surface Subsidence of the Mining Area Based on SBAS

“…According to the D-InSAR technology limitations, in recently years, some scholars abroad calculated the deformation rate effectively by using least squares estimation method in the high coherence point target , through virtual observation method, and in which accuracy and reliability of D-InSAR technology deformation calculation has been improved (Usai et al, 1999) and (Usai et al, 2003) . Ferretti, etc.…”