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Title:
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Linear and nonlinear terrain deformation maps from a reduced set of interferometric SAR images
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Author:
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Mora Sacristan, Óscar; Mallorquí Franquet, Jordi Joan; Broquetas Ibars, Antoni
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Other authors:
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Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions; Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció |
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Abstract:
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In this paper, an advanced technique for the generation of deformation maps using synthetic aperture radar (SAR) data is presented. The algorithm estimates the linear and nonlinear components of the displacement, the error of the digital elevation model (DEM) used to cancel the topographic terms, and the atmospheric artifacts from a reduced set of low spatial resolution interferograms. The pixel candidates are selected from those presenting a good coherence level in the whole set of interferograms and the resulting nonuniform mesh tessellated with the Delauney triangulation to establish connections among them. The linear component of movement and DEM error are estimated adjusting a linear model to the data only on the connections. Later on, this information, once unwrapped to retrieve the absolute values, is used to calculate the nonlinear component of movement and atmospheric artifacts with alternate filtering techniques in both the temporal and spatial domains. The method presents high flexibility with respect to the required number of images and the baselines length. However, better results are obtained with large datasets of short baseline interferograms. The technique has been tested with European Remote Sensing SAR data from an area of Catalonia (Spain) and validated with on-field precise leveling measurements. |
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Abstract:
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Peer Reviewed |
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Subject(s):
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-Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Teledetecció
-Boundary layer (Meteorology)
-Radar Equipment and supplies
-Signal detection
-Image processing
-Topography
-Geophysical instruments
-geophysical signal processing
-radar imaging
-radiowave interferometry
-remote sensing by radar
-synthetic aperture radar
-terrain mapping
-topography (Earth)
-DEM
-Delauney triangulation
-atmospheric artifacts
-coherence level
-digital elevation model
-filtering techniques
-interferometric SAR images
-linear terrain deformation maps
-low spatial resolution interferograms
-nonlinear terrain deformation maps
-nonuniform mesh
-remote sensing
-synthetic aperture radar
-Capa límit (Meteorologia)
-Detecció del senyal
-Topografia
-Radar
-Geofísica -- Aparells i instruments
-Imatge -- Processament |
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Rights:
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Document type:
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Article |
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Published by:
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IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
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