A multi-temporal InSAR method incorporating both persistent scatterer and small baseline approaches

  • Hooper A
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Synthetic aperture radar (SAR) interferometry is a technique that
provides high-resolution measurements of the ground displacement
associated with many geophysical processes. Advanced techniques involving
the simultaneous processing of multiple SAR acquisitions in time
increase the number of locations where a deformation signal can be
extracted and reduce associated error. Currently there are two broad
categories of algorithms for processing multiple acquisitions, persistent
scatterer and small baseline methods, which are optimized for different
models of scattering. However, the scattering characteristics of
real terrains usually lay between these two end-member models. I
present here a new method that combines both approaches, to extract
the deformation signal at more points and with higher overall signal-to-noise
ratio than can either approach alone. I apply the combined method
to data acquired over Eyjafjallajokull volcano in Iceland, and detect
time-varying ground displacements associated with two intrusion events.

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  • Andrew J. Hooper

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