Statistics – Applications
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.475..125c&link_type=abstract
In: Proceedings of the Third International Symposium on Retrieval of Bio- and Geophysical Parameters from SAR Data for Land Appl
Statistics
Applications
Hazards, Dtm
Scientific paper
Spaceborne differential radar interferometry has already proven its potential for mapping ground deformation phenomena in application to, among others, volcano dynamics, co-seismic and post-seismic displacements of faults and slope instability. However, atmospheric disturbances as well as phase decorrelation have prevented hitherto this technique from achieving full operational capability. These drawbacks are overcome by carrying out measurements on a subset of image pixels corresponding to natural or artificial stable reflectors (Permanent Scatterers, PS) and exploiting temporal series of interferometric data. Results obtained by processing 55 Synthetic Aperture Radar acquisitions of ERS satellites (European Space Agency) over Southern California, show that this approach allows one to push measurement accuracy very close to its theoretical limit of one millimetre. Though a full 3D displacement field cannot be recovered, the spatial density of measurements (up to 300 PS/km2), their accuracy and economic competitiveness, are far higher than corresponding values achievable with static GPS. PS time series analysis is therefore a powerful tool for risk assessment and is going to contribute significantly to improve our understanding of fault dynamics, stress accumulation and strain accommodation, evolution of soils, as well as systematic stability check of individual buildings and infrastructures.
Colesanti Carlo
Ferretti Alessandro
Prati Claudio
Rocca Fabio
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