期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2003
卷号：XXXIV-5/W12
出版社：Copernicus Publications
摘要：The wooden structure that supports the roof of Palazzo Ducale is very complex becouse of continuous works of maintainance and restoration occurred during centuries. The photogrammetric laboratory of CIRCE – IUAV is employed in the survey and representation of the overstanding structure of Major Council Hall that, by one side, supports the covering and , by the other, upholds the box ceiling of the hall. The truss structure is trampleble and visitable only throught a thin catwalk standing on the middle of the orizontal tie beam. A traditional topographical survey appears hard just becouse of the unavoidable movement of the structure that is very elastic. Photogrammtery is unproposeble just for the strict space and for the its complexity. It was decided to realise some laser scans setting up the instruments having care to not urge the wooden flooring to avoid any movements. Nine scans have been done surveying 10 milions points. Clouds were alligned using targerts to obtain one unique cloud. From the big cloud some "sub-clouds" of points have been extracted contained each one a truss, doing as matter of fact some thick trasversal sections. The sub-clouds have been employed in the 3D modelling of each wooden element applying the solid modelling tecniques based on primitives to better interpolate the laser points. The choice was to realize a 3D model geometrically regular of each elements to represent the real complexity of the cover system
关键词：laser scanning – complex structure survey – 3D modelling
