Use of Multi-Temporal SAR Interferometry on Sentinel-1 Data to Detect and Monitor Ground Movements in the Republic of Ireland.
Abstract
Regions of temperate oceanic climate have historically represented a challenge for the application of satellite-based multi-temporal SAR interferometry. The landscapes of such regions are commonly characterized by extensive, seasonally-variable vegetation coverage that caused low temporal coherence and limited the detection capabilities of SAR imagery as acquired, for instance, by previous ERS-1/2 and ENVISAT missions. In this work, we exploited the enhanced resolution in space and time of the recently deployed Sentinel-1A/B SAR satellites to detect and monitor ground motions occurring in two study areas in the Republic of Ireland. The first, is a 1,800 km2 area spanning the upland karst of the Clare Burren and the adjacent mantled lowland karst of East Galway. The second, which comprises an active mine site, was chosen to assess the capabilities of the interferometric approach to detect ground movements related to mining activities. The available datasets, consisting of more than 100 images acquired in both ascending and descending orbits from April 2015 to March 2018, were processed by using the Permanent Scatterer approach. The obtained results highlight the presence of small-scale ground motions in both urban and natural environments with displacement rates up to -17 mm/yr. Localised subsidence was detected in recently built areas, along the rail network, and over the mine site, while zones of subsidence, uplift, or both have been recorded in different peatland areas. Furthermore, several measured target points indicate the presence of unstable areas along the coastline. These promising results demonstrate the feasibility of adopting Sentinel-1 multi-temporal interferometry for the detection and monitoring of ground movements at large scales in environments influenced by temperature oceanic climate, such as in the Republic of Ireland and North-western Europe.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.G41B0702F
- Keywords:
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- 1240 Satellite geodesy: results;
- GEODESY AND GRAVITYDE: 1241 Satellite geodesy: technical issues;
- GEODESY AND GRAVITYDE: 1908 Cyberinfrastructure;
- INFORMATICSDE: 1932 High-performance computing;
- INFORMATICS