Double laser scan

Double Scans with Leica RTC360 Laser Scanner

In these days we are testing the Leica RTC360 scanner in the company. Leaving aside the specifications of the scanner, which can be found on the manufacturer’s website, we wanted to talk about a very useful function that is present in this scanner, or better, the “Double Scan”.

This feature activates a different scanning procedure than it does in the standard mode, that is: “Double Scan” and photo.

Double Scan Function

The “Double Scan” is very useful in all those situations in which in the environment to be detected there are vehicles or people in motion (for example on a construction site or in a street), as it manages to eliminate all the points that, between the two scans, have undergone a “Displacement” (they moved). We have tested this function in an ‘as built’ survey of some components in a construction site that we are following; during the entire survey there were about ten workers at work. The following images are taken from two consecutive clouds performed 3 minutes apart, the first without the “Double Scan” and the second with the “Double Scan” inserted.

Without Double Scan

It can be seen that in the second scan there are no workers’ silhouettes (they were not on lunch break).

With Double Scan

The high scanning speed of this scanner (50 seconds for a complete scan at medium resolution, or 6mm @ 10m) allows you to perform a double survey of points in less than two minutes, plus another minute for photos.
A little less efficient is the algorithm on the photos that populates the construction site with ‘ghosts’, but in terms of the color of the cloud, in reality the “points” are not there.

Edited by:

Architect Gianpaolo Stringa

Designer BIM Division – Research and Development LA SIA

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