Underwater photogrammetry for 3D modelling of floating objects: the case study of a 19-foot motor boat

Abstract

3D modeling of floating or semi-submerged objects is a challenging and attractive task for the
\nmarine industry especially if the manufacturing of components that have to be replaced or repaired after a
\ndamage is necessary or the ship itself has to be converted. Up to now the 3D reverse engineering of ships has
\nrequired docking operations to carry out a geodetic or photogrammetric survey with high costs for shipowners.
\nIn this paper an innovative 3D acquisition method for digital recording of floating objects is presented.
\nThe method is based on digital photogrammetry both underwater and terrestrial. Preliminary tests are presented
\nfor the case study of a 19-foot motor boat. Two surveys of the boat in floating conditions are carried
\nout and then joined by means of special rigid orientation devices built ad hoc.