A Methodology to Detect and Update Active Deformation Areas Based on Sentinel-1 SAR Images

Abstract

This work is focused on deformation activity mapping and monitoring using Sentinel-1 (S-1) data and the DInSAR (Differential Interferometric Synthetic Aperture Radar) technique. The main goal is to present a procedure to periodically update and assess the geohazard activity (volcanic activity, landslides and ground-subsidence) of a given area by exploiting the wide area coverage and the high coherence and temporal sampling (revisit time up to six days) provided by the S-1 satellites. The main products of the procedure are two updatable maps: the deformation activity map and the active deformation areas map. These maps present two different levels of information aimed at different levels of geohazard risk management, from a very simplified level of information to the classical deformation map based on SAR interferometry. The methodology has been successfully applied to La Gomera, Tenerife and Gran Canaria Islands (Canary Island archipelago). The main obtained results are discussed.

An Incomplete Inventory of Suspected Human-Induced Surface Deformation in North America Detected by Satellite Interferometric Synthetic-Aperture Radar

“…To this end, we have made our catalog of sources available in the supplemental material in the hope that other researchers will build upon it to expand the temporal and spatial coverage-we have no plans to continue this compilation at a continental scale. While our analysis of historic data has been incomplete due to limitations of data quality (e.g., poor C-band coherence from ERS-1/2 and Envisat in most areas of eastern North America) and computing resources (e.g., we have not yet been able to process the entire archive for time series), there are opportunities for routine and automated wide area mapping using data from Sentinel-1a/b (e.g., [71]) that would improve upon our approach.…”

Innovative methods to monitor rock and mountain slope deformation

“…The results for descending orbits (D_95) for Sentinel-1 and the results for the descending orbits for Envisat (D_394) in line of sight are shown in Figure 4. The stability threshold (the green colours points) was chosen as 1 time the standard deviation of the velocity along the line of sight for the Envisat data (the above -3.1 mm/a) and +8 mm/a which corresponds to the standard deviation of the velocity field for the Sentinel-1 dataset [35]. The device used within the Vigilans project is the GBIn-SAR Lisamobile system (Ellegi Ltd.), a Linear SAR that provides measurements at Ku frequency band (central frequency: 17.2 GHz; wavelength: 17.44 mm) with a synthetic aperture of up to 3 m ( Figure 5).…”

Fast detection of ground motions on vulnerable elements using Sentinel-1 InSAR data

“…This parameter is used to facilitate the clustering process. Barra et al (2017b) contains a description in detail of the methodology.…”

“…Finally, a fourth phase is required to intersect the three previously generated outputs in order to derive the VEAM final output (Figure 1). All the phases are described below, however a more detailed description of the PSI processing, the ADA extraction and the Geohazard Activity Maps updating can be found in Barra et al (2017b).…”