1. A procedure to use GNSS data to calibrate satellite PSI data for the study of subsidence:an example from the north-western Adriatic coast (Italy)
- Author
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Nicola Casagli, M. Del Soldato, Silvia Bianchini, and Gregorio Farolfi
- Subjects
Synthetic aperture radar ,Atmospheric Science ,010504 meteorology & atmospheric sciences ,0211 other engineering and technologies ,deformation map ,02 engineering and technology ,01 natural sciences ,lcsh:Oceanography ,gnss ,Interferometric synthetic aperture radar ,Calibration ,lcsh:GC1-1581 ,Computers in Earth Sciences ,Physics::Atmospheric and Oceanic Physics ,sar ,021101 geological & geomatics engineering ,0105 earth and related environmental sciences ,General Environmental Science ,Remote sensing ,insar ,Applied Mathematics ,lcsh:QE1-996.5 ,Astrophysics::Instrumentation and Methods for Astrophysics ,Subsidence (atmosphere) ,persistent scatterers interferometry ,calibration ,lcsh:Geology ,Interferometry ,Computer Science::Graphics ,GNSS applications ,Satellite ,GNSS ,SAR ,Persistent Scatterers Interferometry ,InSAR ,Geology - Abstract
Multi-temporal interferometric Persistent Scatterers Interferometry (PSI) techniques derive from the elaboration of satellite Synthetic Aperture Radar (SAR) images and represent a useful tool to detect ground millimetric movements over wide areas; thanks to non-invasiveness and high accuracy. However, PSI data are relative measurements estimated along the sensor Line Of Sight and referred to a chosen stable motionless reference point, so they lack absolute reference both in time and space. In this work, we propose a methodological procedure that exploits Global Navigation Satellite System (GNSS) data acquired from permanent stations to calibrate and fix relative InSAR results into conventional geodetic reference systems. Mean yearly velocities of PSI radar targets are corrected with GNSS values throughout operative procedures used in geodesy for crustal and local deformation data. The methodology is tested in Ravenna and Ferrara cities on the north-western Adriatic coast within the eastern alluvial plain of Po river (Italy), extensively affected by subsidence with strong spatial and temporal variations. The results reveal high rates of long-term subsidence of the study area and the effectiveness of the presented methodology for producing unique ground deformation maps over wide areas. .
- Published
- 2019