Specifying 3D Accuracy When Using a SLAM Scanner

image of PX-80 Specifying 3D Accuracy
Specifying 3D Accuracy

Monday’s post, which caused an encouraging jump in traffic, came in part from the preparations that are underway for a webinar on specifying 3D accuracy for laser scanners. This educational webinar, co-sponsored by the USIBD and Paracosm will discuss the need to update surveying standards from 2D to 3D, provide an overview of the USIBD Level of Accuracy (LOA) specification and explain how these two topics can be applied to the use of Paracosm’s PX-80 handheld, SLAM-based laser scanner.

To learn more, you are invited to attend the webinar entitled, “Examining Accuracy in Building Documentation: USIBD’s Level of Accuracy Specification and SLAM-Based Scanning” on July 10, 2019 from 2 to 3 PM EDT. To register click here.

Let’s face it scanners are the classic black box. Scanners are also dumb. To make up for the inability of a scanner to efficiently locate the critical items of interest in a survey it has to use a “shotgun approach” to cover the scene with millions of 3D points, leaving it up to the person in the office to select the critical locations.

In the “good old days,” the Party Chief used a “rifle approach” to locate just those points needed to satisfy the intent of the survey. That’s how the Party Chief got his/her job. They knew which points to collect and how accurately to collect them. Two points determine a straight line and a surface with a constant slope. A center and a radius describes a horizontal curve.

Sometime I have to wonder if we are that much further ahead by having millions of 3D points on a highway surface versus cross sections every 25 feet at the critical points, safety concerns notwithstanding? In many cases, I don’t think we are.

Of course there are many challenging 3D surveying projects, such as complicated 3D piping in industrial plants which was the original use case for the tripod laser scanner where it is invaluable. But, in general the technology is ahead of our ability to effectively use it and a large part of the reason for that is the lack of standards. This results in every firm having to re-invent the wheel and for customers not knowing how to compare proposals using standard metrics. All of this adds up to a significant loss of productivity.

The webinar on July 10 will explore these topics and more. Hope you can join us to share your perspective.  

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This entry was posted in BIM, Business Development, Education, Geomatics, Hardware, Indoor Mapping, Laser Scanning, Lidar, point clouds, Quality, Sensors, SLAM, Standards, Surveying, Surveying Engineering and tagged , , , , . Bookmark the permalink.

1 Response to Specifying 3D Accuracy When Using a SLAM Scanner

  1. Tony Sabat says:

    Great post, looking forward to it!

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