Just scan it!

My first exposure to a 3D laser scanner was the Faro Focus 3D. This brilliant tool came with the capability to collect over 4 million points in a matter of seconds. This obviously blew our minds as the best we could do at the time was multiple points using a total station. A couple of years later SLAM algorithms and IMU sensitivity has led to laser scanners being used in various mining applications and on different platforms. Handheld, drone mounted, tripod based etc. This in turn has led to the rise of a number of misconceptions about 3D laser scanners.

Here are a few examples:

Real-time mapping and instant scanning: One common fallacy is that 3D laser scanners can map underground regions instantly and in real time. While technology has advanced and become more efficient, the scanning process still takes time, and data processing and modeling can be time-consuming as well. It might not be as quick as some expect.

Complete coverage: Another common fallacy is that a single scan can cover the entire underground area. In reality, the line of sight and accessibility in underground mines can be limited, resulting in incomplete data. These blank areas are commonly known as shadows. Multiple scans from various places are frequently required to obtain broader coverage.

Ease of use: Some people feel that 3D laser scanners are simple to operate and require little training. However, efficiently operating these devices, guaranteeing data accuracy, and interpreting the results can be difficult and need specific skills.

There is no need for additional survey methods: While 3D laser scanning is a powerful survey approach, it is not a one-size-fits-all answer for all underground mining surveying needs. Traditional surveying techniques and methodologies may still be required for specific tasks, validation or orientation.

Perfect realism representation: Although laser scanners produce detailed and accurate data, they are not perfect. The accuracy of the data collected can be affected by factors such as scanner resolution, ambient conditions, and scanner calibration. The presence of dust, splitsets, people, equipment and other protruding objects affects the quality of the survey.

Cost: There may be some misunderstandings concerning the initial cost of 3D laser scanners being prohibitive. While the technology can be costly, it is critical to consider the long-term benefits and cost savings it can give in terms of enhanced efficiency, safety, and downtime.

Concerns about safety: Some people believe that employing laser scanners in underground locations is dangerous because of the presence of potentially explosive gases. Modern laser scanners, on the other hand, are designed to be intrinsically safe and acceptable for usage in hazardous areas.

Applications are limited: Some individuals believe that 3D laser scanners are only effective for creating point clouds and simple representations. In reality, the acquired data can be processed and evaluated for a variety of purposes, such as volume estimates, deformation monitoring, and geological mapping.

To dispel these myths, it is critical to first comprehend the capabilities, constraints, and best practices for effectively using 3D laser scanners in underground mining surveying are discussed.