SqueeSAR™ is an all-stage monitoring tool for engineering projects: from the design to the construction and operation phases.
SqueeSAR™ can provide an important input to all stages of any construction project by identifying unstable areas affected by ground movements and reconstructing their displacement history. It also gives a unique support in surveying underground constructions.
Our SqueeSAR™ analyses are used to:
- determine existing ground movements during site selection processes,
- assess impacts of engineering activities and complement conventional monitoring,
- assess the stability of key infrastructure, multiple assets or distributed networks.
No ground-based instrumentation is required. By identifying targets already present on the ground, SqueeSAR™ detects a significantly higher density of measurement points than any traditional ground-based surveys (e.g. GPS, leveling, total stations).
We are member of the International Tunnelling and Underground Association - ITA-AITES.
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SqueeSAR™ gives a unique support in reconstructing past ground motion patterns, which could potentially impact civil constructions.
Using a historical archive of satellite imagery, SqueeSAR™ can identify unstable areas and reconstruct their displacement to assist in the planning of new sites, routes, network extensions and duplications for e.g., giving a unique insight for key development projects.
For linear structures such as roads and railways, monitoring with satellite data minimizes survey time and cost compared to traditional techniques.
Design of a highway in southern Italy. The image shows the result of a historical satellite analysis to
reconstruct past ground motion that could potentially impact the alignment. Satellite imagery: RADARSAT-1, Analysis period: 2003 – 2011, Background image: Microsoft Visual Earth.
SqueeSAR™ detects millimitre-scale ground settlement occurring during construction works.
By mapping the temporal evolution of ground displacement occurring during construction, engineers can better understand the relationship between activities and the onset of any related settlement. SqueeSAR™ offers thousands of measurement points over large areas, at a fraction of the cost of traditional monitoring. It also increases displacement information beyond excavation surroundings, to determine the extent of any deformaion occuring within a wider area.
SqueeSAR™ also solves uncertainty: it eventually verifies that the predicted deformation corresponds to reality.
City of Bologna: Construction of the underground railway station. The image shows the number and density of SqueeSAR™ measurements compared to other monitoring systems: structural/geotechnical and topographic monitoring to detect the excavation area, station structures and buildings in the surroundings. Thanks to the coverage and density of SqueeSAR™ measurements, a better characterization and evaluation of displacement induced by excavation were obtained.
Southern Italy: Construction of a tunnel crossing the city center. SqueeSAR™ data highlighted an even wider subsiding area in comparison to the predicted one. They were also used to assess lost volumes and solve the uncertainty arising from the underground geological and hydrogeological models. Satellite imagery: COSMO SkyMed, Analysis period: 2009 – 2014, Background image: Regional Cartography.
Milan: an overview of Milan wide area. In the two developing areas of City Life and Porta Nuova, building renovation projects are probably at the origin of uplifting due to initial demolition operations. The map also shows Milan metro routes (existing and under construction) that can be surveyed by SqueeSAR™.
Impact of tunnelling activities during metro construction. The image shows the cumulated displacement during the analysis period. Satellite imagery: TerraSAR-X, Analysis period 2008 – 2010, Background image: Cartographic and Geological Institute of Catalonia (ICGC).
Regular monitoring of post-construction displacement with SqueeSAR™ can identify structural weaknesses.
control impact on assets
Identifying movements that could indicate a structural weakness helps engineers to determine if remedial actions should be taken. Moreover, satellite monitoring with SqueeSAR™ provides deformation maps for assessing areas at risk that could potentially affect structures.
NEW ORLEANS: SqueeSAR™ data highlights the instability of the flood defences before Hurricane Katrina affected the area in 2005. Satellite imagery: RADARSAT-1, Analysis period: Apr. 2002 – Jan. 2007, Background image: Google Earth.
TOKYO: satellite analysis with SqueeSAR™ highlights ground instability and differential displacements occurring along runways, terminal buildings and infrastructure of the airport. Satellite imagery: RADARSAT-1, Analysis period: Dic. 2004 – Jan. 2010, Background image: Google Earth.
A satellite monitoring project over the Canada Line, a rapid transit system in Vancouver’s busiest north-south corridor, linking downtown to the international airport and the city of Richmond. Subsidence is mainly occurring in areas of compacting sediments (in the image, the line close to Vancouver airport and Richmond). Satellite imagery: COSMO SkyMed, Analysis period: 2013 – 2014, Background image: Microsoft Virtual Earth.
Impact of water extraction on a highway. The ground motion map and cross section show the evolution and distribution of displacement over time. Satellite imagery: TerraSAR-X, Analysis period: 2008 – 2010, Background image: Cartographic and Geological Institute of Catalonia (ICGC).