FAQ - 3D Laser Scanning

The following is an evolving list of frequently asked questions and concerns we encounter involving 3D laser scanning and modeling.

Q. What is 3D laser scanning or LIDAR?

A. Simply put, 3D laser scanning, or LIDAR, works on the same principle as a laser range finder. The central unit sends out laser and when it contacts a surface, that point of contact is recorded. The difference being 50,000 up to 900,000 points can be recorded every second, and they are recorded into a 3D composite environment. Additionally photographs maybe correlated with the point locations to colorize the points for realistic feel.

Q. What is the accuracy expectation of 3D scanning?

A. Accuracy is dependent upon the model of scanner, and distance scanned. For an average duty scanner, an accuracy of 1-3mm ,for under 100ft. away, and, 3-4mm for over 100ft. way, can be expected.

Q. What is the output of a 3D laser scan?

A. The initial output of a laser scan is a point cloud. A point cloud consists of the coordinately referenced points within a 3D coordinate system. A 3D reproduction of the scan in a virtual environment. Multiple point clouds can be merged through a process called registering, which is using common reference points to orient the clouds to each other. The clouds, whether separate or combined can then be exported to any number of formats, DWG's to ASCII text files, to then be used in other design software. More on that further along in the FAQ.