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  Hyperspectral imaging: a novel geological mapping technique for subsurface construction sites

  Documenting and mapping of geology is an important task during tunnel construction. Hyperspectral imaging is an established method utilising optical reflectance properties of minerals for remote mapping and analysis of geology. Close range hyperspectral imaging has the potential to map mineralogy and lithology on tunnel faces. A feasibility study from the Mont Terri underground rock laboratory in Switzerland is presented, with the aim to assess the applicability of combined lidar and hyperspectral imaging in geo-engineering subsurface applications. Hyperspectral imaging provides rapid and automatic mapping of geology, improving the documentation process and updating of geological models during construction, allowing: (i) complete coverage of tunnel surfaces, (ii) mapping mineral types that may be difficult to identify by eye, (iii) archiving geology for evaluation after excavation and surface sealing.

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