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Your search keyword '"Fernández-Merodo, José Antonio"' showing total 2 results
Start Over Author "Fernández-Merodo, José Antonio" Topic synthetic aperture radar
2 results on '"Fernández-Merodo, José Antonio"'

1. Wavelet analysis of land subsidence time-series: Madrid Tertiary aquifer case study.

Author

Tomás, Roberto, Pastor, José Luis, Béjar-Pizarro, Marta, Bonì, Roberta, Ezquerro, Pablo, Fernández-Merodo, José Antonio, Guardiola-Albert, Carolina, Herrera, Gerardo, Meisina, Claudia, Teatini, Pietro, Zucca, Francesco, Zoccarato, Claudia, and Franceschini, Andrea

Subjects
LAND subsidence, WAVELETS (Mathematics), SYNTHETIC aperture radar, WAVELET transforms, AQUIFERS, SIGNAL processing
Abstract

Interpretation of land subsidence time-series to understand the evolution of the phenomenon and the existing relationships between triggers and measured displacements is a great challenge. Continuous wavelet transform (CWT) is a powerful signal processing method mainly suitable for the analysis of individual nonstationary time-series. CWT expands time-series into the time-frequency space allowing identification of localized nonstationary periodicities. Complementarily, Cross Wavelet Transform (XWT) and Wavelet Coherence (WTC) methods allow the comparison of two time-series that may be expected to be related in order to identify regions in the time-frequency domain that exhibit large common cross-power and wavelet coherence, respectively, and therefore are evocative of causality. In this work we use CWT, XWT and WTC to analyze piezometric and InSAR (interferometric synthetic aperture radar) time-series from the Tertiary aquifer of Madrid (Spain) to illustrate their capabilities for interpreting land subsidence and piezometric time-series information. [ABSTRACT FROM AUTHOR]

Published
2020
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2. Vulnerability Assessment of Buildings due to Land Subsidence Using InSAR Data in the Ancient Historical City of Pistoia (Italy).

Author

Ezquerro, Pablo, Del Soldato, Matteo, Solari, Lorenzo, Tomás, Roberto, Raspini, Federico, Ceccatelli, Mattia, Fernández-Merodo, José Antonio, Casagli, Nicola, and Herrera, Gerardo

Subjects
LAND subsidence, SYNTHETIC aperture radar, URBAN planning, LAND use
Abstract

The launch of the medium resolution Synthetic Aperture Radar (SAR) Sentinel-1 constellation in 2014 has allowed public and private organizations to introduce SAR interferometry (InSAR) products as a valuable option in their monitoring systems. The massive stacks of displacement data resulting from the processing of large C-B and radar images can be used to highlight temporal and spatial deformation anomalies, and their detailed analysis and postprocessing to generate operative products for final users. In this work, the wide-area mapping capability of Sentinel-1 was used in synergy with the COSMO-SkyMed high resolution SAR data to characterize ground subsidence affecting the urban fabric of the city of Pistoia (Tuscany Region, central Italy). Line of sight velocities were decomposed on vertical and E–W components, observing slight horizontal movements towards the center of the subsidence area. Vertical displacements and damage field surveys allowed for the calculation of the probability of damage depending on the displacement velocity by means of fragility curves. Finally, these data were translated to damage probability and potential loss maps. These products are useful for urban planning and geohazard management, focusing on the identification of the most hazardous areas on which to concentrate efforts and resources. [ABSTRACT FROM AUTHOR]

Published
2020
Full Text
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