Abstract
Abstract. The paper presents a software dedicated to the elaboration of point clouds, called Intelligent Cloud Viewer (ICV), made in-house by AESEI software (Spin-Off of Politecnico di Bari), allowing to view point cloud of several tens of millions of points, also on of “no” very high performance systems. The elaborations are carried out on the whole point cloud and managed by means of the display only part of it in order to speed up rendering. It is designed for 64-bit Windows and is fully written in C ++ and integrates different specialized modules for computer graphics (Open Inventor by SGI, Silicon Graphics Inc), maths (BLAS, EIGEN), computational geometry (CGAL, Computational Geometry Algorithms Library), registration and advanced algorithms for point clouds (PCL, Point Cloud Library), advanced data structures (BOOST, Basic Object Oriented Supporting Tools), etc. ICV incorporates a number of features such as, for example, cropping, transformation and georeferencing, matching, registration, decimation, sections, distances calculation between clouds, etc. It has been tested on photographic and TLS (Terrestrial Laser Scanner) data, obtaining satisfactory results. The potentialities of the software have been tested by carrying out the photogrammetric survey of the Castel del Monte which was already available in previous laser scanner survey made from the ground by the same authors. For the aerophotogrammetric survey has been adopted a flight height of approximately 1000ft AGL (Above Ground Level) and, overall, have been acquired over 800 photos in just over 15 minutes, with a covering not less than 80%, the planned speed of about 90 knots.
Highlights
Terrestrial laser scanner (TLS) and photogrammetric techniques are increasingly used in order to modeling both natural and anthropic surfaces in 3D at an unprecedented resolution and precision
The TLS survey has returned a precise model of Castel del Monte, has required a great deal of work both in the survey phase and in elaboration
The aerial survey of the oblique photo, instead, was performed in about an hour and has enabled through the use of the Structure from Motion to obtain a 3D model of the object valid metrically if, it is refers only to the outside of the site visible from the airplane
Summary
Terrestrial laser scanner (TLS) and photogrammetric techniques are increasingly used in order to modeling both natural and anthropic surfaces in 3D at an unprecedented resolution and precision. The potentialities of the software have been tested by carrying out the Photogrammetric survey of the Castel del Monte which was already available in previous laser scanner survey made from the ground by the same authors. Known for its distinctive octagonal shape and for being the most mysterious among Frederick’s buildings, Castel del Monte is one of the main tourist destinations in Puglia. The solution to connect the main closed polygonal line joining the vertices outside the building and, countervailable, to the secondary of the ground floor in the direction of the entrance portal has allowed to stiffen the geometry of the network. In order to ensure coverage of the entire building and to minimize the shadow areas a total of 92 scanword TLS have been acquired (fig. 6)
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