Abstract
Abstract. Data provided by Light Detection And Ranging (LiDAR) can be very useful, and their applications are very diverse. Information about the reflection, its intensity values of individual points give the possibility of a realistic visualization of the entire scanned object. This use of LiDAR is very important in improving safety and avoiding disasters. The use of LiDAR technology allows to 'look' and extract information about the structure of the object without the need for external lighting or daylight. In the paper the results of Terrestrial Laser Scanning (TLS) measurements conducted by means of the Leica C-10 scanner will be presented. The measurement will be performed in rooms without daylight: in the basement of the ruins of the medieval tower located in Dobre Miasto and in the basement of a century-old building located at the University of Warmia and Mazury in Olsztyn. Next, the obtained dataset of x, y, z and intensity will be processed using the Optimum Dataset (OptD) method. The application of the OptD allows to keep more points of interest area where surface is imperfect (e.g. cracks and cavities) and reduce more points of the low interest homogeneous surface (redundant information). The OptD algorithm was additionally modified by detecting and segmentation defects on a scale from 0 to 3 such as (0) harmless, (1) to the inventory, (2) requiring repair, (3) dangerous. The obtained survey results proved the high effectiveness of the modified OptD method in detection and segmentation wall defects.
Highlights
The growing interest of investors in the revitalization of buildings under conservation protection has resulted in the need to quickly and accurately perform inventory, measurements and research necessary in the process of designing and obtaining decisions of conservation offices. 3D laser scanning is a documentation method that is great for studying monuments
We propose to modify the Optimum Dataset (OptD) method of reducing the point cloud with automatic dataset segmentation in the context of detecting defects in a building wall
Combining the possibilities of the OptD method with simultaneous classification gives the opportunity to study the structure of objects already at the stage of initial data processing
Summary
The growing interest of investors in the revitalization of buildings under conservation protection has resulted in the need to quickly and accurately perform inventory, measurements and research necessary in the process of designing and obtaining decisions of conservation offices. 3D laser scanning is a documentation method that is great for studying monuments. Thanks to the built-in digital camera, along with scanning, complete photographic documentation of the object is collected, which can be placed on the point cloud as a texture. This combination of two documentary methods, i.e. laser scanning and photos, allows to obtain the necessary data about the object, and above all information about defects, gaps, cracks. Such a study is clear to architectural designers who work on the revitalization and adaptation of historic architecture. It should be noted that, the reduction and segmentation of point clouds is currently special interest research topic (Du & Zhuo, 2009), (Lin, Benziger, & Habib, 2016), (Maglo, Lavoue, Dupont, & Hudelot, 2015), This contribution has been peer-reviewed
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