Wahbeh, Wissam

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Wahbeh, Wissam

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Now showing 1 - 5 of 5
  • Publication
    Extraction of main levels of a building from a large point cloud
    (20.09.2019) Wahbeh, Wissam [in: Measurement, Visualisation and Processing in BIM for Design and Construction Management]
    Horizontal levels are references entities, the base of man-made environments. Their creation is the first step for various applications including the BIM (Building Information Modelling). BIM is an emerging methodology, widely used for new constructions, and increasingly applied to existing buildings (scan-to-BIM). The as-built BIM process is still mainly manual or semi-automatic and therefore is highly time-consuming. The automation of the as-built BIM is a challenging topic among the research community. This study is part of an ongoing research into the scan-to-BIM process regarding the extraction of the principal structure of a building. More specifically, here we present a strategy to automatically detect the building levels from a large point cloud obtained with a terrestrial laser scanner survey. The identification of the horizontal planes is the first indispensable step to produce an as-built BIM model. Our algorithm, developed in C++, is based on plane extraction by means of the RANSAC algorithm followed by the minimization of the quadrate sum of points-plane distance. Moreover, this paper will take an in-depth look at the influence of data resolution in the accuracy of plane extraction and at the necessary accuracy for the construction of a BIM model. A laser scanner survey of a three floors building composed by 36 scan stations has produced a point cloud of about 550 million points. The estimated plane parameters at different data resolution are analysed in terms of distance from the full points cloud resolution.
    04B - Beitrag Konferenzschrift
  • Publication
    06 - Präsentation
  • Publication
    Parametric design as game changer
    (01/2019) Wahbeh, Wissam
    06 - Präsentation
  • Publication
    3D survey and digital models as the first documentation of hypogeum of S. Saba in Rome
    (Springer, 08.10.2018) Wahbeh, Wissam [in: Applied Geomatics]
    On the Aventine Minor, the oratory of Santa Silvia was home to a community of oriental monks, who, in the first half of the seventeenth century, created a typical Palestinian cemetery with a small monastery that expanded with the growing prestige of the community. The construction of the Basilica of San Saba, above the oratory, was by a group of monks, “the Benedettini di Montecassino,” who lived there in the middle of the tenth century. The substructure was only recovered in the early 1900s. The study of this architectural structure is particularly interesting because there were no complete surveys and the available documentation, as far as we know, was limited to a graphical plan and section. For this reason and due to the archeological significance, it has been selected as a national research project (PRIN 2010–2011). The research has requested detailed documentation through laser scanning and photographic-based documentation. The goal of the present work is to produce a documentation of the oratory from CAD model to the BIM construction.
    01A - Beitrag in wissenschaftlicher Zeitschrift