Geohazards cause human loss, damage to infrastructure and property and have huge economic, societal and environmental impacts. Geohazards are expected to increase in number and severity due to climate change, urbanisation etc. Geofem combines satellite image analysis from optical and radar sensors, with geotechnical engineering analysis for geohazard applications. This enables us to provide the best solutions for our clients in terms of early warning systems, automated monitoring systems, risk evaluations, engineering assessments and ground movement prediction analysis.
South West coastline of the Isle of Wight
Geofem conducted an Interferometric survey using Synthetic Aperture Radar in the SW coast of the Isle of Wight, UK. The primary study area is the Roughlands Landslide located south of Brook village. A set of 40 Sentinel-1 scenes for the period between January 1st, 2017 and December 21st, 2017 were acquired and processed to determine the ground movement along the coastline. The Small Baseline Subset (SBAS) Interferometric Stacking technique was applied.
Geofem is the coordinator of the RANTKAT project funded by the European Regional Development Funds, the European Structural Funds, the Republic of Cyprus and the Ministry of Energy, Commerce, Industry and Tourism. The project aims at developing a landslide risk evaluation tool using ground movement measurements obtained from satellite Synthetic Aperture Radar (SAR) data and considering geotechnical and other parameters of the examined areas. The project involves a GIS interface for hosting a landslide risk map.
Pissouri Landslide Project
Pissouri, a village between the cities of Limassol and Paphos in Cyprus, has long suffered from landslides over the years. Geofem performed ground movement monitoring using Persistent Scatterer Interferometry (PSI) and Small Baseline Subset (SBAS) in the village of Pissouri to evaluate the risk of landslides in the area.
Pretoria-Johannesburg Gautrain rail line
The Gautrain, the commuter rail line that opened in 2012 in South Africa connects Johannesburg and Pretoria (80-kilometre). The area is characterised by sinkholes. Geofem conducted an investigation using radar satellite techniques to identify areas of potential sink hole hazard.
Subsidence and uplift due to swelling clays
Geofem performed an SBAS analysis on a dataset covering the period of 2016-2018 in an area characterised by swelling clays. Results showed differential settlements with uplift during the winter season and subsidence during summer.
Interferometric analysis following an earthquake enables determination of the ground movements and extent of areas affected.