3D laser scanning is a well-known term in architecture, construction, engineering, industrial and infrastructural projects, cultural heritage preservation, as well as other activities that require accurate 3D visualisation of spaces and spatial objects. Using the latest 3D laser scanning technologies, the laser scanner sends beams towards the objects to measure its reflection, making data gathering and creating BIM models accurate, quick and efficient. The aforementioned process provides us with a measurable 3D model in the form of point cloud, where each point has its precise coordinates that enable us to quickly determine the geometry and the type of objects in question.
During the field work part of the process, operators examine the field of interest with the goal of creating a schedule for the scanning process. Depending on the level of detail required, projects are created and the settings inside the scanner are defined in order to complete the job as efficiently as possible. 3D laser scanners are set on certain positions from which the points of areas / objects are collected. It is extremely important to set the scanners on locations that enable a sufficient amount of overlapping points between neighbouring positions. This way the processing becomes more successful and the end result is of higher quality.
Processing and registration of point cloud
Once the field work is complete, we move into the office and transfer the raw data from the scanner onto the computer where the processing and registration is done in a special software. The first step is automatic pre-processing, where raw point clouds are filtered and coloured (if needed), and the meta is searched (if used). All of this is done to prepare the scans for further use.
The term “registration” stands for connection the recorded point clouds (each individual position) into one unit with the goal of receiving the real image of area in question. Depending on the field work method and the evaluation of operators, certain automatic methods of point cloud registration are applied, and the entire process is hand-searched to avoid eventual errors.
Once the scans have successfully been registered, a unique point cloud is created. It can be cleared if needed, in order to remove eventual visual interferences and excess data that are of no use in further modelling elements. Point cloud can also be georeferenced to set it on its actual location within the coordinate system, and based on point measurements in the field by using total station or GPS.
The final point cloud is further used to create 3D BIM models with the required level of detail.
Advantages of modern methods
Perhaps the most known advantages of laser scanning are its time and accuracy. There are numerous other advantages, such as:
GO2BIM has three laser scanners at its disposal, as well as a drone which scans inaccessible parts. The technology we possess enables us to measure objects quickly and precisely, no matter their size, purpose and different kinds of infrastructure.
For more information on laser scanning, contact us. We will gladly answer your questions!