Abstract
The aim of this exploratory research is to capture spatial evolution patterns in the Bucharest metropolitan area using sets of single polarised synthetic aperture radar (SAR) satellite data and multi-temporal radar interferometry. Three sets of SAR data acquired during the years 1992–2010 from ERS-1/-2 and ENVISAT, and 2011–2014 from TerraSAR-X satellites were used in conjunction with the Small Baseline Subset (SBAS) and persistent scatterers (PS) high-resolution multi-temporal interferometry (InSAR) techniques to provide maps of line-of-sight displacements. The satellite-based remote sensing results were combined with results derived from classical methodologies (i.e., diachronic cartography) and field research to study possible trends in developments over former clay pits, landfill excavation sites, and industrial parks. The ground displacement trend patterns were analysed using several linear and nonlinear models, and techniques. Trends based on the estimated ground displacement are characterised by long-term memory, indicated by low noise Hurst exponents, which in the long-term form interesting attractors. We hypothesize these attractors to be tectonic stress fields generated by transpressional movements.
Highlights
The aim of this exploratory research is to capture spatial evolution patterns in the Bucharest metropolitan area using sets of single polarised synthetic aperture radar (SAR) satellite data and multitemporal radar interferometry
This research aims to identify trends in Bucharest’s ground displacement dynamics by analysing three sets of synthetic aperture radar (SAR) satellite data collected over a period of 20 years: historical European Space Agency (ESA) SAR data acquired by European Remote Sensing (ERS-1/-2) and ENVISAT satellites and recent high-resolution German Aerospace Center (DLR) SAR data acquired by the TerraSAR-X (TSX) satellite (Fig. 1)
The selection of test zones was made considering the human impact criteria: large industrial parks spread in the meadows and on the interfluves between the Dâmbovița and Colentina Rivers
Summary
The aim of this exploratory research is to capture spatial evolution patterns in the Bucharest metropolitan area using sets of single polarised synthetic aperture radar (SAR) satellite data and multitemporal radar interferometry. After 2001, identifying ground displacement dynamics in urban areas has been supported by high-precision, repeated, and large-scale measurements of ground displacements using InSAR techniques[6,7,8,9,10] Some of these studies focused on subsidence, which sometimes measured less than 1 mm and was caused by groundwater over-exploitation, or uplift[11,12,13,14,15]. This research aims to identify trends in Bucharest’s ground displacement dynamics by analysing three sets of synthetic aperture radar (SAR) satellite data collected over a period of 20 years: historical European Space Agency (ESA) SAR data acquired by European Remote Sensing (ERS-1/-2) and ENVISAT satellites and recent high-resolution German Aerospace Center (DLR) SAR data acquired by the TerraSAR-X (TSX) satellite (Fig. 1). Historical satellite data consisted of 28 ERS-1/-2 images acquired between 1992 and
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