Double Scans with Leica RTC360 Laser Scanner

Double Scans with Leica RTC360 Laser Scanner

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

This function activates a different scanning procedure than the standard mode, that is: double scan and photo.

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 the construction site or on the street) as it can eliminate all the points that have undergone one between the two scans “Displacement” (they moved).


We tested this function in the as built survey of some components during a construction site we are following; during the whole survey there were about ten workers at work in the room. The following images are taken from two consecutive clouds performed at a distance of 3 minutes, the first without the “Double Scan” and the second with the “Double Scan” inserted.

Scan without “Double Scan”

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

Scan with “Double Scan”
‘Ghosts’ photographed by the laser scanner

The fast scanning speed of this scanner (50 seconds for a full scan at medium resolution ie 6mm @ 10m) allows you to perform a double survey of the points in less than two minutes, plus another minute for photos.

A little less performing is the algorithm on the photos that populates the construction site with ghosts, but in terms of the color of the cloud, in reality there are no “points”.

Point cloud generated by the laser scanner

Edited by:

Architect Gianpaolo Stringa

BIM Division Designer – Research and Development La SIA