3D Laser Scanning
DWA’s expert technicians use 3D scanning and LiDAR technology to provide a comprehensive data capture service in the form of point cloud surveys. Using this technology we can provide virtual maps of any three dimensional object, ranging from large scale models to minute component parts.
As professional 3D scanning operatives, we are able to provide a variety of 3D scanning units to provide the ideal balance between range, speed, durability, and accuracy needed for each specific job. This ensures only the highest quality point cloud surveys are created.
How 3D Laser Scanning Works
3D Laser Scanning(also known as High Definition Surveying, HDS, or LiDAR) is a process in which lasers are used to accurately map 3D objects and landscapes. As there are many different types of scanner available providing varying levels of accuracy, range, speed and durability, it is important to choose the right unit for the job. DWA carry a wide range of different scanners to ensure the correct one will be available for your specific requirements.
3D scanners are also able to record the how reflective the surfaces are, which allows intensity to be built into the map. In addition to this, many of today’s scanners can also provide colour values when contact is made, and can capture up to 1 million points of data per second, which allows for highly accurate point cloud surveys.
3D scanners work by firing lasers out across all three axes of dimension, and at every point the laser hits a surface, a point is recorded on the 3D map.
For a laser scanner to work it needs an unobstructed line of site. This means for full point cloud surveys to be made multiple scans need to be taken from different vantage points. The amount of scans needed, the interval between each scan, and the distance from the target at which the scanners can be placed varies depending on the size of the object.
Placing the scanners correctly is vital to ensure a high quality map is made. If the scans are taken too sparsely, the 3D map will lack detail and appear poorly rendered. It is for this reason it is essential to hire experienced 3D scanning operatives such as DWA surveyors.
There are a number of methods by which the scans can be joined together. They will typically be linked either manually by targeting key points in the scans, or by taking scans at a closer density to provide a considerable overlap of information. This allows the scans to be joined by an automated computer program.
When the individual scans have been compiled together, it is readied for modelling to begin. Superfluous points are deleted, and the model is assessed as a whole for accuracy and its ability to perform all tasks required of it. The point cloud data is then rendered into a visual 3D map by using modelling software such as AutoCAD 3D, Inventor, or Solidworks. This 3D model can then be delivered to the client in their desired format.