VALUTAZIONI DI QUALITA’ TRA SISTEMI DI ACQUISIZIONE MOBILE E LASER SCANNER STATICI PER LO STUDIO PRELIMINARE DI UN BENE ARCHITETTONICO

Abstract

In 3D surveying and modelling, the need to acquire data in an ever faster and easier-to-use manner is becoming increasingly apparent, so survey times can be optimised as much as possible. New workflows therefore tend to limit the use of traditional static scanning systems and move towards approaches that offer significant time savings. Among the several available systems, Handheld Mobile Laser Scanner (HMLS) systems based on SLAM (Simultaneous Localisation and Mapping) technology are gaining increasing attention for architectural and building surveying, also due to their adaptability for situations where it would be difficult to use other three-dimensional acquisition systems. Although these systems are already widely used, the accuracy and reliability of the acquired data have not yet been properly verified in relation to different survey situations. Therefore, at present, point clouds acquired with static devices represent the theoretically most accurate solution. The paper addresses this problem by proposing a preliminary evaluation between data acquired with a portable mobile laser scanner and a static laser scanner system. The evaluations were carried out within the framework of the research activity conducted for the survey and documentation of the “Santa Maria della Grotta” complex in Marsala (Italy).