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By S. Troisi, V. Baiocchi, S. Del Pizzo and F. Giannone


Actually complex underground structures and facilities occupy a wide space in our cities, most of them are often unsurveyed; cable duct, drainage system are not exception. Furthermore, several inspection operations are performed in critical air condition, that do not allow or make more difficult a conventional survey. In this scenario a prompt methodology to survey and georeferencing such facilities is often indispensable. <br><br> A visual based approach was proposed in this paper; such methodology provides a 3D model of the environment and the path followed by the camera using the conventional photogrammetric/Structure from motion software tools. The key-role is played by the lens camera; indeed, a fisheye system was employed to obtain a very wide field of view (FOV) and therefore high overlapping among the frames. The camera geometry is in according to a forward motion along the axis camera. Consequently, to avoid instability of bundle adjustment algorithm a preliminary calibration of camera was carried out. A specific case study was reported and the accuracy achieved

Topics: Technology, T, Engineering (General). Civil engineering (General), TA1-2040, Applied optics. Photonics, TA1501-1820
Publisher: Copernicus Publications
Year: 2017
DOI identifier: 10.5194/isprs-archives-XLII-2-W3-639-2017
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