Mobile Digital Cameras for As-Built Surveys of Roadside Features

Wang²,

Proceedings of the International Symposium on Automation and Robotics in Construction (IAARC)

2016

-Digital technologies, including hand-held laser scanners and locating systems, are being increasingly introduced to the construction market and have the potential to provide real-time data to create construction information modeling (e.g. shop drawings and as-built). Focusing on the unique advantage of these technologies, this paper identifies the challenges and opportunities for implanting such technologies to create multi-dimensional information modeling based on updated data from construction objects. The results of the paper will be based on implementation of a proposed framework to assist in semi-automated conversion of the raw 3D point clouds from advanced scanners into a compact, semantically rich model aiding in updating construction drawings and developing as-built models. A couple of advanced laser scanners have been deployed within an educational building and have scanned a floor as a sample in order to collect the data. In addition, further data was collected using novel positioning systems, to generate updated data from objectives and labor working in the sample area. The findings show that mobile laser scanners and the novel locating system are efficient tools for updating data to assist construction and maintenance managers to revise the drawings and use updated multi-dimensional models, and are about 50% less expensive than the current technologies. It was found that the practical framework -using mobile laser scanners -enables construction managers to acquire updated information from complex objects, using a real-time communication system. The study provides a step towards understanding the possibility of implementing advanced technologies and internet-of things in construction, and assisting in developing a shop drawing revision modelling for construction purposes.

Section: The Current Manual Methodsmentioning

confidence: 99%

“…Photogrammetry usually cannot be used independently in creating as-built, and it is not an ideal solution for as-built [17]. Recent studies attempt to integrate digital photogrammetry with lidar scanners [13,16].…”

Section: The Current Manual Methodsmentioning

confidence: 99%

Challenges and Opportunities for Implementation of Laser Scanners in Building Construction

Wang²,

Proceedings of the International Symposium on Automation and Robotics in Construction (IAARC)

2016

“…For example, Wang and Love [14] explained that traditional site layout method is labour intensive and required many times of re-measuring. Historically, sketch and photos are used to supplement the traditional method to assist CAD operators to enhance the information and accuracy of traditional as-built planning without any ground control [15]. Recently, researchers try to use photogrammetry techniques to produce digital and parametric data for as-built information modelling.…”

Section: Data Acquisition Methodsmentioning

confidence: 99%

“…Photogrammetry usually cannot be used independently in creating as-built, and it is not an ideal solution for asbuilt [19]. Recent studies attempt to integrate digital photogrammetry with lidar scanners [15,20]. Occlusion (-): temporary supporting structures make some edges invisible in one photo of the objects.…”

Section: Data Acquisition Methodsmentioning

confidence: 99%

Utilisation of a New Terrestrial Scanner for Reconstruction of As-Built Models: A Comparative Study

Lim²,

Proceedings of the International Symposium on Automation and Robotics in Construction (IAARC)

et al. 2015

Recent studies show a great potential of improving construction productivity through using real-time applications to measure change orders and other objects to create as-built. As an enhancement to this promising concept, this paper presents the process of implementation of an efficient framework for as-built Building Information Modelling (BIM) using a new Scan Station that enables contractors to acquire accurate data and create and update the asbuilt models. A novel framework designed and assisted in the conversion of the raw 3D point cloud data from a laser scanner positioned at multiple locations of a facility into a compact and semantically rich model. The result of the study was compared with two other as-built models using mobile and terrestrial lidar scanners to understand the capability of each for building information modelling. It was found that the framework using the new Scan Station has a great potential to collect accurate data that can be transferred to BIM for creating as-built models. The results show that the accuracy of fine objects' dimensions varies from -2% to +2%. The comparison of the test results with our previous experiments using different scanners shows that every scanner has its own advantage for each job in construction.

“…Historically, sketch and photos are used to supplement traditional method to assist CAD operators to enhance the information and accuracy of traditional as-built planning without any ground control [16]. Recently, researchers try to use photogrammetry techniques to produce digital and parametric data for asbuilt information modelling.…”

Section: Photogrammetrymentioning

confidence: 99%

Implementation of As-Built Information Modelling UsingMobile and Terrestrial Lidar Systems

Lim²,

Proceedings of the International Symposium on Automation and Robotics in Construction (IAARC)

et al. 2014

-Recently it is observed that there is an increasing trend of using lidar point clouds in construction, since lidar is able to provide highly accurate 3-dimensional representations of objects. The flip side of a lidar point cloud is its massive size and therefore prolonged time for data processing. Our research aims to develop an efficient framework for as-built modelling in terms of time, cost and performance. For this, we collected lidar point clouds using two different data collection methods (i.e. mobile and terrestrial lidar systems with a few centimetre level accuracy) and constructed solid 3-dimensional models of a building. The procedures of creating asbuilt models from both data acquisition methods are compared to understand the capability of each for automatic building information modelling. In order to create as-built models, a framework consisting of eight key stages from data capturing to constructing the building information model is developed. It was found that the framework using mobile lidar enables contractors to create as-built models for complex objects in a timely manner, whereas the framework using terrestrial lidar provides us with more accurate as-built information models. The implementation results of the two frameworks using mobile and terrestrial lidar systems vary between 5-30 mm and 1-45 mm, respectively. It is anticipated that the proposed study becomes a step forward to full automation of lidar-based building information modelling.