Abstract
Abstract. Build on soft soil, close to sea level the Netherlands is at high risk for the effects of subsidence and deformation. Interferometric Synthetic Aperture Radar (InSAR) is successfully used to monitor the deformation trends at millimetre level. Unfortunately the InSAR deformation trends suffer from poor geolocation estimates, limiting the ability to link deformation behaviour to objects, such as buildings, streets or bridges. A nationwide, high resolution, airborne LiDAR point cloud is available in the Netherlands. Although the position accuracy of this LiDAR point cloud is to low for deformation estimates, linking the InSAR location to the geometries outlined by the LiDAR point can improve the geolocation estimates of the InSAR trends. To our knowledge no such integration is available as of yet. In this article we outline methods to link deformation estimates to the LiDAR point cloud and give an outlook of possible improvements. As a test we link 3.1 million TerraSAR-X InSAR Persistent Scatterers to 3 billion LiDAR points, covering the city of Delft and surroundings.
Highlights
Subsidence in the Netherlands, and deformation in general, is threatening building integrity, damaging infrastructure and lowering the land with respect to sea-level
The source of the deformation signal is, in general, less accurately known: geolocation estimates of PS-Interferometric Synthetic Aperture Radar (InSAR) are known with metres precision at best, depending on the sensor (Dheenathayalan et al, 2016)
This will allow for deformation estimates up to street level (Ketelaar et al, 2006), the deformation signal can not be attributed to a single geometric feature
Summary
Subsidence in the Netherlands, and deformation in general, is threatening building integrity, damaging infrastructure and lowering the land with respect to sea-level. The source of the deformation signal is, in general, less accurately known: geolocation estimates of PS-InSAR are known with metres precision at best, depending on the sensor (Dheenathayalan et al, 2016). This will allow for deformation estimates up to street level (Ketelaar et al, 2006), the deformation signal can not be attributed to a single geometric feature. Persistent scatterer InSAR (PS-InSAR) measurements are commonly dominated by a single scatterer The location of this scatterer is of key importance in the understanding and interpretation of the deformation behaviour: a subsiding garden house or street will require different precautions than a subsiding bridge pillar
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