The SAR interferometer technique allows detecting small movements of the ground surface. One of the most effective is the Permanent Scatters (PS-InSAR) technique proposed by Ferretti et al., 2001. The PS are points on the ground (buildings, rocks, etc.) that show high long-term phase coherence, as well as strong and stable backscatter level through time. Since PS do not change their signature with time, they can be used to estimate the sub-vertical motion of the ground, within the range of millimetre motions/year (fraction of the 5.6 cm-wavelength). PS velocity values are relative to a chosen reference point that is assumed to be stable. Thirty-eight ERS1/2 SAR descending scenes, taken from 1992 to 2000, allow detecting over 2 million PS with a variable distribution density. This large data set required geostatistical and spatial cluster analysis (Hot Spot Analysis) that allowed generating maps of iso-kinematic ...
Analysis of Interferometry Data (permanent Scatterers: Ps-Insar to Identify Active Tectonic Structures in Western Alps (nw Italy)
F Piana;
2008
Abstract
The SAR interferometer technique allows detecting small movements of the ground surface. One of the most effective is the Permanent Scatters (PS-InSAR) technique proposed by Ferretti et al., 2001. The PS are points on the ground (buildings, rocks, etc.) that show high long-term phase coherence, as well as strong and stable backscatter level through time. Since PS do not change their signature with time, they can be used to estimate the sub-vertical motion of the ground, within the range of millimetre motions/year (fraction of the 5.6 cm-wavelength). PS velocity values are relative to a chosen reference point that is assumed to be stable. Thirty-eight ERS1/2 SAR descending scenes, taken from 1992 to 2000, allow detecting over 2 million PS with a variable distribution density. This large data set required geostatistical and spatial cluster analysis (Hot Spot Analysis) that allowed generating maps of iso-kinematic ...I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
