Abstract
We present a detailed map of ground movement in Italy derived from the combination of the Global Navigation Satellite System (GNSS) and Satellite Synthetic Aperture Radar (SAR) interferometry. These techniques are two of the most used space geodetic techniques to study Earth surface deformation. The above techniques provide displacements with respect to different components of the ground point position; GNSSs use the geocentric International Terrestrial Reference System 1989 (ITRS89), whereas the satellite SAR interferometry components are identified by the Lines of Sight (LOSs) between a satellite and ground points. Moreover, SAR interferometry is a differential technique, and for that reason, displacements have no absolute reference datum. We performed datum alignment of InSAR products using precise velocity fields derived from GNSS permanent stations. The result is a coherent ground velocity field with detailed boundaries of velocity patterns that provide new information about the complex geodynamics involved on the Italian peninsula and about local movements.
Highlights
Global Navigation Satellite System (GNSS) and radar interferometry are the most common space geodetic techniques used to study ground and Earth crust deformations
The first GNSS networks were installed in the early 1990s, and since that time they have recorded a collection of long-term high-quality data around the world that contribute to the definition of accurate geodynamic modelsand a consistent basic infrastructure for accurate positioning systems [1,2,3]
We present a robust method to validate Differential Interferometric Synthetic Aperture Radar (DInSAR) with GNSS based on geospatial statistical analyses to determine the first map of ground movements of the whole Italian peninsula at a fine scale
Summary
GNSSs and radar interferometry are the most common space geodetic techniques used to study ground and Earth crust deformations. Radar interferometry from space has provided very accurate observations of the Earth since 1992 It proves useful for mapping ground movement for detecting deformations such as landslides and subsidence [4,5,6,7]. By combining two or more radar images of the same area, positional changes are revealed This technique, which is called Differential Interferometric Synthetic Aperture Radar (DInSAR), has been improved by deformation analysis uses two main categories of backscatter: Persistent Scatterers (PS) and Distributed Scatterers (DS). The DInSAR technique is ideal for local movements such as landslides [13], but it is not ideal for studying larger areas involved in phenomena such as subsidence and uplift zones. We present a robust method to validate DInSAR with GNSS based on geospatial statistical analyses to determine the first map of ground movements of the whole Italian peninsula at a fine scale
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