A New Indoor Lidar-Based MMS Challenging Complex Architectural Environments

Abstract

Abstract. The use of moving devices equipped with range- and image-based sensor, generically defined Mobile Mapping systems (MMS), have been quite a disruptive innovation in the development of Geomatics techniques for 3D surveying large indoor-outdoor spaces and offer multiple solutions. The recent expansion of portable devices in the form of trolleys, backpacks, handheld tools largely implements SLAM (Simultaneous Localization and Mapping) algorithms and technology based on both Lidar and/or visual solutions for answering to the positioning and the 3D reconstruction problems. The research on MMS is directed to improve both multi-sensor integration implementation and usability of systems in diversified use contexts and application fields. The aim of the presented research is the evaluation of the potential of the Swift system recently developed by FARO Technologies, that has been fine-tuned for regular and large extent interiors mapping (such as factories, hospitals, airports, offices). The work tries to preliminary investigate the data delivery and usability of the integrated system. This is based on three elements mounted on a sliding trolley moved by the operator walking: the ScanPlan profilometer working for the 2D SLAM mapping, the static TLS Focus S-series, and the smartphone managing the sensors operation and the acquisition progress. The evaluation strategy undertaken will be based on the global and local performance analysis related to the trajectory, the data accuracy, the metric content and consistency. Two test studies belonging to the 20th century. architecture are presented in a preliminary framework of evaluation and validation: a Liberty-style cinema and the Torino Esposizioni Hall B designed in ferrocement by pier Luigi Nervi.

Digital Twinning for 20th Century Concrete Heritage: HBIM Cognitive Model for Torino Esposizioni Halls

“…This is useful for pre-positioning the scan data during the moving acquisition progression. The actual range-based acquisition is based on the combination of two different scans typology: the long-interval scans and the anchor scans [ 44 ]. If the former is represented by the acquisition of the standard static scans (with tens of minutes scanning and RGB captured data), the latest is a faster version of a static scan, performed along the trajectory characterised by short duration and lower densities, according to the setting parameters (without RGB captured data in the present research release but implemented in current system configuration).…”

“…The Swift scans processing reported the following accuracy statistics on hall C (earlier test in hall B reported in [ 44 ] and synthesised in Table 5 ): ICP registration of the anchor scans block: 5 mm accuracy (47% <4 mm) (dataset II). ICP registration of (II) with Mobile scan 7 mm (dataset III).…”

“…In these cases, the use of the point cloud requires further processing and filtering operation. The validation of the clouds from the point of view of local and global metric accuracy has been addressed in [ 44 ], while here, the goal is to validate their empirical use in scan-to-BIM modelling processes.…”

Affordable Sensors for Speditive and Accurate Documentation of Built Heritage: First Tests and Preliminary Results

“…Mobile mapping systems (MMS) are widely used technology for spatial data collection of large-scale projects like city mapping and they function by equipping moving devices with laser scanning or imaging sensors, which can also be used for built heritage documentation (Alsadik & Jasim, 2018;Bonfanti et al, 2021), even in underground scenarios where TLS are scarcely used due to limited accessibility and non-uniform lighting condition (Di Stefano et al, 2021). Besides MMS, recent studies showed that other LiDAR technologies have been used to document Forgotten Cultural Heritage, such as TLS or Airborne LiDAR sensors (ALS) (Maté-Gonzalez et al, 2022).…”

Towards Continuous Monitoring of Architecture. Terrestrial Laser Scanning and Mobile Mapping System for the Diagnostic Phases of the Cultural Heritage

“…In this constantly evolving scenario, the introduction of new methods of documentation and recording of the morphometric characteristics, through the use of MMS survey methodologies, have strongly influenced the activities related to the monitoring of cultural heritage that require a continuous collection of threedimensional data. The use of these devices constitutes a real innovation in the Geomatics sector and the undisputed value of mobile mapping systems is the possibility of significantly accelerating the data acquisition and processing phases (Bonfanti, 2021). The researches on the subject are manifold and show a variety of hardware solutions, with dynamic acquisition procedures through the use of trolleys, backpacks, trolleys, and software.…”