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Working Group 4.1.3

3D Point Cloud based Spatio-temporal Monitoring

Chair: Jens-Andre Paffenholz (Germany)
Vice-Chair: Corinna Harmening (Austria)

The WG will focus on spatio-temporal monitoring of artificial and natural objects with the aid of 3D point clouds acquired by means of multi-sensor-systems (MSS). The emphasis will primarily be placed on laser scanning technology and to certain extend on digital cameras. In general, monitoring applications over a certain period of time require a geo-referencing of the acquired data with respect to a known datum. Also, a kinematic MSS requires for a referencing to determine the time-dependent seven degrees of freedom (translation, rotation and scale).

Specific objectives of the Working Group are:


  • Performance characterization of laser scanners and cameras and their fusion in MSS with respect to spatio-temporal monitoring of artificial and natural objects in different scales. Potential objects or scenarios can range from plant phenotyping to infrastructure buildings


  • Evaluate the object abstraction for epochal comparison by means of discrete point-wise, areas-based and shape-based approaches. One suitable method to investigate will be B-spline surfaces


  • Investigate and develop suitable algorithms for change tracking over time in 3D point clouds, for instance by means of feature point tracking or shape matching


  • Evaluate the fusion of heterogeneous data like 3D point clouds and ground-based synthetic aperture radar (GB-SAR) data with respect to structural health monitoring applications including infrastructure buildings


  • Algorithms will be implemented in Python, Matlab, C++ whereas for basic 3D point cloud operations open source libraries should be used, such as point cloud library (PCL),


  • Establishing links to colleagues from civil and mechanical engineering to benefit from each other in terms of structural health monitoring


  • Establishing working links between this working group and similar national and international working groups such as DVW, ISPRS, IAG and FIG working groups

Specific projects to be undertaken include:


  • Comparative study of different laser scanners in a plant phenotyping scenario in a greenhouse environment. The focus should be on low-cost laser scanners in contrast to high-end triangulation sensors. (link with plant scientists)


  • Loading tests of concrete structures in laboratory environments


  • Simultaneous observations and cross-comparisons using laser scanner, camera and GB-SAR of suitable objects