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Case Studies

Foulness Island

Foulness Island

The imperative of a newly erected building situated on variable and compressible soil arose, yet the site’s stringent constraints restricted direct access for settlement measurements. In response to these challenges, a novel approach was adopted to overcome the limitations. Strategically positioned corner reflectors were incorporated during the construction phase. This innovative solution enabled the measurement of both building and surrounding ground displacement at precise points through the utilisation of Interferometric Synthetic Aperture Radar (InSAR) analysis of satellite radar data.

By embedding these corner reflectors, the monitoring process evolved into a remote non-intrusive methodology. This transformative technique eliminated the need for on-site visits, offering a streamlined and efficient solution to the access-related impediments. The InSAR technology harnessed satellite-based radar to capture detailed and accurate information about ground and structure movements over time. This not only facilitated comprehensive settlement monitoring but also provided valuable insights into the dynamic behaviour of the building and its immediate environment. The strategic installation of corner reflectors emerged as an innovative and effective solution, showcasing adaptability and ingenuity in addressing the challenges associated with obtaining settlement measurements in areas of restricted access.


  • Building and ground settlement monitoring was needed on a site with severely restricted access. 

  • Corner reflectors were designed and installed at specific locations during construction.  

  • Remote settlement monitoring of the building and surrounding ground by InSAR is ongoing. 

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