Murphy & Topcon describe the issues involved in choosing the correct laser scanner. Presented at the COMIT Community Day on 12th March 2015 in London.

1. COMIT community dayMarch 12th 2015
What Project? What Task? What Output? What Scanner?
Thinking of purchasing a laser scanner for point cloud capture?
Are you bemused by the terminology and specifications supplied by the manufacturers?
Not sure of what your workflow will entail?

2. Technology Adoption
Gartner Hype Cycle Chart

3. Sources:
Laser Scanning Adoption

4. Laser Scanner

5. Point Cloud

8. The Process
Brief Requirements Site Visit Scanner Selection
Site ScanRegistrationPost ProcessingPublish for Review
Archive Publish to
Model
Application

9. Statistical Overdose

10. Score Card

11. Field of View Topcon GLS-2000
Vertical (Deg) 270
Horizontal (Deg) 360
Scan Window Capability (Y/N) Yes

12. IP First Number Protection
Against Solid Objects
IP Second Number Protection
Against Liquids
0 No protection 0 No protection
1
Protected against solid objects up to 50 mm
e.g. accidental touch by hands
1
Protected against vertically falling drops of
water (e.g. condensation)
2
Protected against solid objects up to 12 mm
e.g. fingers
2
Protected against direct sprays of water up to
15º from the vertical
3
8 Protected against solid objects more than
2.5 mm e.g. tools and small wires
3
Protected against direct sprays of water up to
60º from the vertical
4
Protected against solid objects more than 1
mm e.g. small wires
4
Protected against water sprayed from all
directions, limited entrance allowed
5
Protected against dust-limited entrance
(no harmful deposit)
5
Protected against low pressure jets of water
from all directions, limited entrance allowed
6 Totally protected against dust 6
Protected against strong jets of water e.g. for
use on ship decks , limited entrance allowed
7
Protected against the effects of immersion
between 15 cm and 1 m
8
Protected against long periods of immersion
under pressure
Environmental Suitability (IP) Topcon GLS-2000
Protection Against Solid Objects 5
Protection Against Liquids 4
Ingress Protection by IEC/EN60.529

13. Noise

14. Noise

15. 50mm
Scan Time (H:M:S)@ XXmm Point spacing from 10m Topcon GLS-2000
10m point spacing 50mm 00:00:20
10m point spacing 12.5mm 00:01:49
10m point spacing 6.3mm 00:07:44
10m point spacing 3.1mm 00:58:29

16. 25mm
Scan Time (H:M:S)@ XXmm Point spacing from 10m Topcon GLS-2000
10m point spacing 50mm 00:00:20
10m point spacing 12.5mm 00:01:49
10m point spacing 6.3mm 00:07:44
10m point spacing 3.1mm 00:58:29

17. 12.5mm
Scan Time (H:M:S)@ XXmm Point spacing from 10m Topcon GLS-2000
10m point spacing 50mm 00:00:20
10m point spacing 12.5mm 00:01:49
10m point spacing 6.3mm 00:07:44
10m point spacing 3.1mm 00:58:29

18. 6.3mm
Scan Time (H:M:S)@ XXmm Point spacing from 10m Topcon GLS-2000
10m point spacing 50mm 00:00:20
10m point spacing 12.5mm 00:01:49
10m point spacing 6.3mm 00:07:44
10m point spacing 3.1mm 00:58:29

19. 3.1mm
Scan Time (H:M:S)@ XXmm Point spacing from 10m Topcon GLS-2000
10m point spacing 50mm 00:00:20
10m point spacing 12.5mm 00:01:49
10m point spacing 6.3mm 00:07:44
10m point spacing 3.1mm 00:58:29

20. Minimum Point Spacing at 10m Topcon GLS-2000
Distance (mm) 3.10

21. Setup Over Survey Station & Back Sight Topcon GLS-2000
Yes / No Yes

22. Typical Raw Data File Size (mb) Topcon GLS-2000
10m point spacing 50mm 15.0
10m point spacing 12.5mm 26.0
10m point spacing 6.3mm 99.0
10m point spacing 3.1mm 2800.0

23. Measurement Method (Y/N) Topcon GLS-2000
Phase Based
Time Of Flight
Time Of Flight (Pulse based) Yes

24. Camera Features Topcon GLS-2000
Pixel size(mb) 5
HDR Capability (Y/N) No
360 Panoramic (Y/N) Yes
360 Capture Time (H:M:S) 00:01:10
Live Camera Feed (Y/N) Yes

25. Range Topcon GLS-2000
Minimum Distance (M) 1m
Maximum Distance (M) 350m

26. Single Point Accuracy @ Various distances Topcon GLS-2000
Upto 50m (+/- Xmm) 3.50
50m-100m (+/- Xmm) 3.50
100m-150m (+/- Xmm) 3.50
150m+ (+/- Xmm) 3.50

27. Accuracy-Real World 1mm

28. Angular Accuracy (seconds of arc) Topcon GLS-2000
Horizontal (+/-) 6
Vertical (+/-) 6

29. Environment Operating Temperature Topcon GLS-2000
Min degs C -5
Max degs C 45

30. Beam Divergence (Spot Size) in mm of Laser @ Topcon GLS-2000
10m
20m 4.1
150m 11.2

31. WI-FI Topcon GLS-2000
Scanner Control (Y/N) No
Live Data Transfer (Y/N) No

32. Direct Data Storage method Topcon GLS-2000
Hard Drive (GB) 0
USB (Y/N) No
SD Card (Y/N) Yes

33. Data Transfer Method From Scanner (Yes/No) Topcon GLS-2000
Wi-Fi No
3G/4G No
Bluetooth No
USB No
SD Card Yes
Cable No

34. Battery Life Topcon GLS-2000
Typical Usage (hr) 4
External Battery Capability Topcon GLS-2000
Yes/No Yes

35. Class of Laser Topcon GLS-2000
Class 1 + 3R
Know what class laser is suitable and safe for your site
A Class 1M laser is safe for all conditions of use
except when passed through magnifying optics
A Class 3R laser is considered safe if handled
carefully, with restricted beam viewing. With a
class 3R laser, the MPE can be exceeded, but
with a low risk of injury. Visible continuous lasers
in Class 3R are limited to 5 mW
Source: http://en.wikipedia.org/wiki/Laser_safety
Laser Visible to Naked Eye Topcon GLS-2000
Yes/No No
A Class 1 laser is safe under all conditions of
normal use. This means the maximum
permissible exposure (MPE) cannot be exceeded
when viewing a laser with the naked eye

36. Levelling of Instrument Method Topcon GLS-2000
None
Inclinometer
Dual Axis Compensator X

37. On-board Preview Topcon GLS-2000
Yes/No Yes

38. Weight
Scanner only (Kg) 9.3
Scanner + Tribrach + Battery (Kg) 10
Scanner in Travel Case (Kg) 15
PhysicalData TopconGLS-2000
Size
Scanner W (mm) 293
Scanner D (mm) 152
Scanner H (mm) 412
Travel Case W (mm) 540
Travel Case D (mm) 400
Travel Case H (mm) 290

39. Object
Interest
Of
Image courtesy of
Registration

40. Image courtesy of
Registration

41. 1. Scans Performed
2. Scans stitched from matching geometry
Cloud to Cloud

42. Survey Control Station Based
1. Targets & scanner placed over survey stations
2. Scans Performed
3. Scan already registered – no processing

43. Target Based
1. Targets placed
2. Scans Performed
3. Scan Registered via targets
Target examples

44. Sphere Based
1. Spheres placed
2. Scans Performed
3. Scan Registered via spheres

45. P1
P2
P3
Manual Pick Point Based
1. Targets placed
2. Scans Performedd
3. Manually identify common points
4. Scan Registered via targets

46. Subjective + Cost

47. Scanner Accessories Software Hardware People
To Scan Up