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Laser Scanning

_High Definition_
_3D Laser Scanning Surveys_

_High Definition_
_3D Laser Scanning Surveys_

What is 3D Laser Scanning?

Terrestrial 3D laser scanning is a rapid data capture technique for surveying buildings and land. Where traditional single point measurement systems - total stations, theodolites and distos - take 1 -2 measurements a second, a 3D laser scanner can take upto 2 million points in a 360 degree sweep. This rapid data acquisition builds a dense 'point cloud' of millions of measurements that can be used as an accurate reference of the target building or site.
Laser Scan Survey, Brstol - Goldney Grotto
Goldney Grotto, Bristol - Full Colour Laser Scan Survey

Methodology of a Laser Scan Survey

Depending on the size of the target building 1 or 2 surveyors with tripod mounted laser scanners will need to attend. Laser scanners are line of sight instruments and need an uninterrupted view of any surface that the surveyor wishes to measure. To capture all areas of the building the laser scanner is set up in a series consecutive positions. 

A project can run from 100 to 1000 scan positions and all these positions need to be joinied together. This process is called registration and this makes the final project point cloud. 

Scanning is a non contact measurement method. During pandemic working restrictions surveys can be completed with all necessary distances maintained and only minor contact with the target building. Our surveyors are currently wearing full PPE and using hand santizer etc to comply with all government requirements.

HDR Colour Capture

Each individual point in a point cloud can be coloured. This colour value can come from the refelectivity of the measured surface (intensity) or it can be an RGB value (Red Green Blue) derived from a photograph. For colour scanning the laser scanner first takes 360 degree laser measurements of the site, and then takes 360 degree photography. By superimposing the photography over the points, processing software can asign an RGB value to each point. 

The result is a photo realistic pointcloud - with coloured measurement points so dense that they act like pixels.

The main cost to this process is time - the extra time capturing photographs and the extra time processing the RGB values. However photgraphy and measurement together gives a complete reference of the building for remote use by contractors and stakeholders any where in the world.
Laser Scan Survey Hammersmith London
Shepherds Building in Hammersmith, London - Full Colour RGB Scan
Laser Scan Survey Shepherds Building Hammersmith London
Shepherds Building in Hammersmith, London - Greyscale Intensity Scan

Uses and Applications for Point Cloud Data

Image

Digital Reference

A point cloud is a digital file. Owners, managers, designers and contractors can inspect site remotely.

Accurate Measurements

A registered point cloud is an accurate resource with laser scanners reaching upto 1mm precision.

BIM Foundation

A laser scan survey is the first stage in BIM workflow for existing buildings.

Laser Scanning Portfolio

+44 7725 236671

info@pointbim.com