Laser Scanning - Queen's University Belfast

3D Laser and Object Scanning in weathering research.
Examples from the Limestone Project, Oxford 2006
Leica HDS 3000 - Laser Scanner, Worcester College
Contact:
John Meneely
School of Geography, Archaeology and Palaeoecology
Queens University Belfast
Tel +44(0) 289097393
Email, J.meneely@qub.ac.uk
Konica Minolta Vi9i – Object Scanner, Worcester College

What is Laser Scanning?
What is Laser scanning?
3d laser scanning is the complete and accurate 3d capture of ‘as is’ geometric information (xyz) quickly and
unobtrusively.
Complete surface geometry of exposed surfaces is remotely captured in minutes in the form of dense,
accurate “3d point clouds”, ready for immediate on site use. Ground based LiDAR (light detection& ranging)
• laser captures detailed and accurate
surface geometry (xyz)
• unprecedented speed accuracy and safety
• remote surface coordinates are collected
in the form of a hyper dense ‘point cloud’
• measurement of surface reflectance and RGB values
• point clouds immediately available for measurement and
analysis
• scanner is moved and rotated around the building to capture entire scene via scene registration
Benefits: High Definition Scanner (HDS)
•remote sensing technique (non-evasive)
•speed of data collection (versus traditional methods)
•number of measurements - approx 2000 points/sec
•accuracy and precision - 6mm laser foot print up to 100m
•data collected in real-time, measurements in real time
•digital reality capture not virtual reality
•Digital archive

3d scanner workflow – Brasnose College, Oxford
1. Scene capture 2. point cloud data – reflectance values 3. point cloud data – RGB values
4. Measure and analyse – surface elevation

3d scanner workflow – New College, Oxford
1. point cloud data – reflectance 2. Measure and analyse – surface elevation
3. Measure and analyse – wall sections every 0.2m
Section 0.00m
Section 5.80m along wall

3d laser scanner – Worcester College Buttery, Oxford
2. Lidar scan – reflectance values
1. Scene capture
2. Point cloud - detail

What is Object Scanning?
What is Object Scanning scanning?
3d object scanning is the complete and accurate 3d capture of ‘as is’ geometric information (xyz) quickly
and unobtrusively.
The object scanner is based on the principal of laser triangulation. A target is scanned with laser stripes .
The CCD camera receives the light reflected from the surface of the subject. Surface shape
measurements of the subject are obtained through triangulation, and converted into a 3D polygon mesh.
The object scanner measures 30720 (640 x 480) points with one scan, simultaneously acquiring surface
shape data and color image data
• laser captures detailed and accurate surface geometry (xyz)
• unprecedented speed accuracy and safety
• measurement of surface and RGB values
Benefits:
•The object scanner requires 2.5 seconds per scan to acquire accurate 3D data
•Speed/accuracy of data collection (versus traditional methods)
•Scan Range: 26mm to 1750mm
•accuracy and precision - +/- 0.05, 0.008mm
•data collected in real-time, measurements in real time
•digital reality capture not virtual reality
•digital archive

3d object scanner workflow – Worcester College Buttery, Oxford
1. Scene capture 2. Scan data – single scan with surface 2. Scan data – polygon mesh
3 Scan data - surface
3 Scan data – RGB (False Colour)

3d object scanner – Worcester College Facade, Oxford
1. Scene capture 2. Scan data – single scan with surface 3. Scan registration
Photographs of ashlar blocks
4. Measurement & Analysis – DEM production