What is Terrestrial Laser Scanning (TLS)?
TLS collects accurate 3D image data necessary for visualization. The term is synonymous with LiDAR, an acronym for “light detection and ranging”. It makes possible the swift measurement of points by automatically scanning the scene at high speed. In the resulting dense point-cloud, objects can be easily identified allowing the creation of 3D models of a wide range of objects with a level of detail impossible to achieve within a reasonable time using a conventional method, such as a surveyor’s total station. Every point in the point cloud can be accurately geo-referenced.
Production Work Flow
Generally, there are four main production stages in a project –
- Data Acquisition – a set of point cloud data is collected at each scan station. Due to line-of-sight requirements, multiple scan stations are normally required to eliminate blind spots and to increase the detail level.
- Registration – multiple point cloud data sets from various scan stations are “stitched” into one large point cloud and cleaned up to eliminate unwanted noise such as pedestrians, traffic, and other unwanted points.
- Modelling – 3D objects such as pipes, valves, steel beams, windows, etc. are extracted from point cloud data and modelled using one or more appropriate software packages. For organic or irregular surfaces, mesh surface models can be generated.
- Documentation – depending on a client’s requirements, models are represented in Building Information Modelling (BIM) or in a traditional drawing format, such as AutoCAD.
We can complete the work flow from start to end. Alternatively, we can work with you to implement laser scanning into your workflow by completing the first two stages and supplying a processed point cloud data set to you.
We would like to improve your existing workflow. If you are interested in finding out how our laser scanning services may add value to your production, we would be delighted to meet with you and explore the opportunities. We often provide lunch and learn sessions (brown bag). We could also provide you with sample point cloud data to see how well the technology could be integrated into your current work flow. Please contact us.
For more in depth information about Laser Scanning technology, please check our article featured in APEGBC’s Innovation magazine.