PSI Deformation Map Retrieval by Means of Temporal Sublook Coherence on Reduced Sets of SAR Images
| Autor: | Daniel Monells, J. A. Gili, Jordi J. Mallorqui, Ruben Iglesias, Jordi Corominas, Carlos Lopez-Martinez, Albert Aguasca, Xavier Fabregas |
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| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental, Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció, Universitat Politècnica de Catalunya. EGEO - Enginyeria Geomàtica, Universitat Politècnica de Catalunya. MSR - Mecànica del Sòls i de les Roques |
| Rok vydání: | 2015 |
| Předmět: |
Interferometria
Synthetic aperture radar Ground-based SAR Topography Topografia Computer science Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Radar [Àrees temàtiques de la UPC] Radar d'obertura sintètica Context (language use) Syntethic aperture radar Areas persistent scatterer interferometry (PSI) Aperture radar interferometry Differential SAR interferometry (DInSAR) Computer vision Spotlight lcsh:Science Image resolution temporal sublook coherence (TSC) persistent scatterer Earths surface Ground-based SAR (GB-SAR) Pixel business.industry Temporal sublook coherence (TSC) Pattern recognition Coherence (statistics) synthetic aperture radar (SAR) differential SAR interferometry (DInSAR) Synthetic aperture radar (SAR) Displacement mapping Persistent scatterer Interferometry Permanent scatterers ground-based SAR (GB-SAR) spotlight General Earth and Planetary Sciences lcsh:Q Topographical surveying Interferograms Artificial intelligence business Compensation Persistent scatterer interferometry (PSI) Pixel density Model |
| Zdroj: | Recercat. Dipósit de la Recerca de Catalunya Universitat Jaume I UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) Remote Sensing; Volume 7; Issue 1; Pages: 530-563 Remote Sensing, Vol 7, Iss 1, Pp 530-563 (2015) |
| ISSN: | 2072-4292 |
| Popis: | Prior to the application of any persistent scatterer interferometry (PSI) technique for the monitoring of terrain displacement phenomena, an adequate pixel selection must be carried out in order to prevent the inclusion of noisy pixels in the processing. The rationale is to detect the so-called persistent scatterers, which are characterized by preserving their phase quality along the multi-temporal set of synthetic aperture radar (SAR) images available. Two criteria are mainly available for the estimation of pixels' phase quality, i.e., the coherence stability and the amplitude dispersion or permanent scatterers (PS) approach. The coherence stability method allows an accurate estimation of the phase statistics, even when a reduced number of SAR acquisitions is available. Unfortunately, it requires the multi-looking of data during the coherence estimation, leading to a spatial resolution loss in the final results. In contrast, the PS approach works at full-resolution, but it demands a larger number of SAR images to be reliable, typically more than 20. There is hence a clear limitation when a full-resolution PSI processing is to be carried out and the number of acquisitions available is small. In this context, a novel pixel selection method based on exploiting the spectral properties of point-like scatterers, referred to as temporal sublook coherence (TSC), has been recently proposed. This paper seeks to demonstrate the advantages of employing PSI techniques by means of TSC on both orbital and ground-based SAR (GB-SAR) data when the number of images available is small (10 images in the work presented). The displacement maps retrieved through the proposed technique are compared, in terms of pixel density and phase quality, with traditional criteria. Two X-band datasets composed of 10 sliding spotlight TerraSAR-X images and 10 GB-SAR images, respectively, over the landslide of El Forn de Canillo (Andorran Pyrenees), are employed for this study. For both datasets, the TSC technique has showed an excellent performance compared with traditional techniques, achieving up to a four-fold increase in the number of persistent scatters detected, compared with the coherence stability approach, and a similar density compared with the PS approach, but free of outliers. |
| Databáze: | OpenAIRE |
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