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| Titel |
PSI Wide Area Product (WAP) for measuring Ground Surface Displacements at regional level for multi-hazards studies |
| VerfasserIn |
Javier Duro, Ruben Iglesias, Pablo Blanco, David Albiol, Fifame Koudogbo |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250114990
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| Publikation (Nr.) |
 EGU/EGU2015-15832.pdf |
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| Zusammenfassung |
| The Wide Area Product (WAP) is a new interferometric product developed to provide
measurement over large regions. Persistent Scatterers Interferometry (PSI) has largely proved
their robust and precise performance in measuring ground surface deformation in different
application domains.
In this context, however, the accurate displacement estimation over large-scale areas
(more than 10.000 km2) characterized by low magnitude motion gradients (3-5 mm/year),
such as the ones induced by inter-seismic or Earth tidal effects, still remains an open issue.
The main reason for that is the inclusion of low quality and more distant persistent scatterers
in order to bridge low-quality areas, such as water bodies, crop areas and forested
regions. This fact yields to spatial propagation errors on PSI integration process, poor
estimation and compensation of the Atmospheric Phase Screen (APS) and the difficult
to face residual long-wavelength phase patterns originated by orbit state vectors
inaccuracies.
Research work for generating a Wide Area Product of ground motion in preparation for
the Sentinel-1 mission has been conducted in the last stages of Terrafirma as well as in other
research programs. These developments propose technological updates for keeping the
precision over large scale PSI analysis. Some of the updates are based on the use of external
information, like meteorological models, and the employment of GNSS data for an improved
calibration of large measurements.
Usually, covering wide regions implies the processing over areas with a land use which is
chiefly focused on livestock, horticulture, urbanization and forest. This represents an
important challenge for providing continuous InSAR measurements and the application of
advanced phase filtering strategies to enhance the coherence. The advanced PSI
processing has been performed out over several areas, allowing a large scale analysis of
tectonic patterns, and motion caused by multi-hazards as volcanic, landslide and
flood.
Several examples of the application of the PSI WAP to wide regions for measuring
ground displacements related to different types of hazards, natural and human induced will be
presented. The InSAR processing approach to measure accurate movements at local and large
scales for allowing multi-hazard interpretation studies will also be discussed. The test areas
will show deformations related to active faults systems, landslides in mountains slopes,
ground compaction over underneath aquifers and movements in volcanic areas. |
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