Volume XLII-2/W3
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-2/W3, 639-644, 2017
https://doi.org/10.5194/isprs-archives-XLII-2-W3-639-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-2/W3, 639-644, 2017
https://doi.org/10.5194/isprs-archives-XLII-2-W3-639-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

  23 Feb 2017

23 Feb 2017

A PROMPT METHODOLOGY TO GEOREFERENCE COMPLEX HYPOGEA ENVIRONMENTS

S. Troisi1, V. Baiocchi2, S. Del Pizzo1, and F. Giannone3 S. Troisi et al.
  • 1Parthenope University of Naples, Centro Direzionale Isola C4, Naples, Italy
  • 2Sapienza University of Rome, DICEA, Via Eudossiana 18, 00184 Rome, Italy
  • 3Niccolò Cusano University Via Don Carlo Gnocchi 3, 00166 Rome, Italy

Keywords: Photogrammetry, Videogrammetry, Structure from Motion, Cultural Heritage, 3D modeling, Georeferencing, Visual Navigation

Abstract. 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.

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.