An overview of Merrick's LiDAR Technology and Geospatial Services at the 4th annual SAME Technical Forum.

1. Presentation to:
November 12, 2009
4th Annual SAME Technical Forum
Colorado School of Mines Student Center
LiDAR Technology and
Geospatial Services

2. Merrick & Company
 Corporate Headquarters: Aurora, Colorado
 Founded in 1955, incorporated in 1959
 Primary Services:
• Architecture
• Civil Engineering
• Facilities Engineering
• GeoSpatial Solutions (GSS)
• Process Engineering
 > 450 employees at 9 national & 2 int’l offices
 FY09 Revenue = $102M
 Ownership: Private (employee-owned)

3. What is LiDAR?
Why use LiDAR?
Examples of LiDAR Data
LiDAR Processing Software
LiDAR Products and
Applications
Types of LiDAR Collections
Multi-Sensor Fusion
The future of LiDAR and
Geospatial Services
Agenda

4. What is LiDAR?
Light Detection And Ranging
 An ultra efficient technology used to collect
three dimensional elevation data from
ground or aerial based acquisitions
 The technology of using pulses of laser
(light) striking the surfaces of the earth
and measuring the time of pulse return
 Used for very rapid collections of highly
accurate XYZ digital map data
 LiDAR acquisition system includes:
 Laser emitter and detector - both occur at a rapid
rate (hundreds of thousands a time per second)
 Scanning system to distribute the laser shots
across the ground or target, typically in a
somewhat evenly dispersed pattern
 GPS (Global Positioning System) for XYZ
 IMU (Inertial Measurement Unit) for ΩΦΚ

5. LiDAR
LiDAR
Cost effective method for
collecting millions to
billions of elevation points
Technology includes:
Airborne GPS
Inertial Measurement Unit
Limited ground control
Pulsed laser detection
technology

6. LiDAR
LiDAR
Cost effective method for
collecting millions to
billions of elevation points
Technology includes:
Airborne GPS
Inertial Measurement Unit
Limited ground control
Pulsed laser detection
technology

7. LiDAR
Cost effective method for
collecting millions to
billions of elevation points
Technology includes:
Airborne GPS
Inertial Measurement Unit
Limited ground control
Pulsed laser detection
technology
LiDAR

8. How LiDAR Works
1. Laser pulse leaves plane
How points are created:

9. 1. Laser pulse leaves plane
2. Pulse reflects off objects
How points are created:
How LiDAR Works

10. 1. Laser pulse leaves plane
2. Pulse reflects off objects
3. Return pulses collected
How points are created:
How LiDAR Works

11. 1. Laser pulse leaves plane
2. Pulse reflects off objects
3. Return pulses collected
5. Returns processed with
GPS and IMU information to
form very accurate XYZ data
How points are created:
4. Time of laser shot “trip”
is calculated and converted
into range (i.e. distance)
How LiDAR Works

12. Benefits of LiDAR
Traditional
photogrammetric
collection
Angle of incidence
Leaf-off preferred
Few ground points in
obscured areas
Different contour
accuracy specification
(1/2 tree stand height)
Stereo
model
Stereo
model
Ground points collected

13. Laser
swath
Laser
swath
Ground points collected
LiDAR Collection
Advantages
Angle of incidence
Leaf-off not required
Ground points in stand
areas
Above ground feature
returns also collected for
additional applications
Benefits of LiDAR

14. LiDAR System Equipment
 LiDAR
 Merrick uses three types:
 ALS40 (52 KHz per sec)
 ALS50 (85 KHz per sec)
 ALS50-II+ (150 KHz per sec)
 Swath width capable of up to 75 degrees
 Capable of scanning up to 70 times per second
 Includes an IMU (inertial measurement unit)
 Altitudes up to 6,100 meters AGL
 Flight navigation system
 Aircraft
 GPS

15. LiDAR System Configurations
With Merrick’s Digital Aerial
Camera System (DACS)
With multi-sensor payload

16. Uses For LiDAR Data
Floodplain management
Topographic surveys
Hydrological modeling
Viewshed analysis
All facets of 3D planning
Pre or post construction
visibility analysis
Cell tower placement
Forest management
Powerline corridor
obstruction management
Supply surface to orthorectify imagery to and
make as accurate as possible
Ground elevation measurements which will be
used to generate contour deliverables
Building, tree, or any other vertical feature
model with accurate elevation
3D data for modeling purposes to be used by
police, fire, emergency management, defense,
etc.
Slope, erosion, landslide, etc. prediction
modeling and analysis
Building, vegetation, powerline, roadway, etc.
inventory and assessment

17.  Better than:
 Free DEM data
 Photogrametrically compiled DTM data
 Faster collection than ground crew survey
data
 Cheaper than other competing forms of
DEM collection
 No film to loose or damage
 Accuracy (+/- 0.25’ or better)
 Vegetation Penetration
 Can collect in between trees better than
stereo models
 Collects ancillary data about trees,
buildings, powerlines, etc.
 Acquisition Efficiencies
 Collects millions/billions of XYZ data
 Not constrained by typical sun angle
window for imagery collection
 possibility of multiple shifts throughout
24-hr day
 avoids daytime weather issues
 avoid air traffic in congested areas
 More detail (resolution) than any other
type of collection
Why use LiDAR?
17,677 Square Miles of
LiDAR @ 1.4 m GSD

18. LiDAR compared to a USGS DEM
30m USGS DEM of Story, WY
Data courtesy of USDA-NRCS

19. LiDAR compared to a USGS DEM
LiDAR DEM of Story, WY
Data courtesy of USDA-NRCS

20. San Diego

21. San Francisco

22. Golden Gate Bridge

23. Imagery – Classification - Elevation

24. • Color by:
- Elevation
- Intensity
- Classification
- Flightline
LiDAR Color Visualization

25. • View by:
- Point cloud
- 2D orthographic
- 3D perspective
- TIN rendered
LiDAR Viewing Capabilities

26. • Orthographic
display and a
cross section
window
simultaneously
• The cross section
can be switched to
a line profile view
LiDAR Cross Section & Profiling

27. • Auto classification
(a.k.a. batch
filtering) is used to
separate the ground
from the above
ground features
• Manual editing is
used to clean up
anything that the
automated
processes did not do
correctly
LiDAR Auto Classification

28. LiDAR Vegetation Penetration

29. LiDAR Vegetation Penetration Data Examples

30. LiDAR Vegetation Penetration Data Examples
Above ground features
Ground (bare earth)
Both

31. 3D Breakline Example
TIN surface with no breaklines TIN surface with breaklines

32. Orthophoto / Contours Breakline Example

33. Hydrological Modeling from LiDAR
1. Orthophoto
2. LiDAR TIN
3. LiDAR bare
earth
4. LiDAR
hillshade
5. Hydrological
model

34. • Contour display tool
- Renders with point,
TIN, and/or ortho
display in 2D or 3D
- Selectable settings:
• Intervals
• Indexes
• Minimum contour
lengths
• Contour by
flightlines
• Classifications to
use for contour
generation
• Contours can be exported
to CAD, GIS, etc.
LiDAR Contour Capabilities

35. Highly Accurate Contour Maps

36. LiDAR Automated Building Classification
• Automated building
classification will filter
out structures from other
canopy or above ground
features
• The tool works with a
from and to classification
• The result can be viewed
in point or TIN form,
with an ortho
background, and in 2D
orthographic or 3D
perspective views

37. Floodplain Mapping
LiDAR DEM
± 1’
10m DEM
± 7’
Above
Uncertain
Below
Images Courtesy of Puget Sound LiDAR Consortium

38. Vegetation Mapping
Area shown is part of the Special Recreation Management Area Near Elko, NV
Source: BLM Nevada State Office.

39. Watershed Analysis

40. Feature Classification

41. Powerline Analysis

42. Railroads

43. Classified LiDAR and Bathymetry
Classified LiDAR:
•Green – above ground
•Tan – bare earth
•Blue – points in water
•Blue line - Thalweg
Seamless Bare-earth LiDAR
and bathymetric data

44. 3D Image Draped Over LiDAR

45. Helicopter LiDAR

46. Mobile LiDAR

47. Terrestrial LiDAR

48. Multi-Sensor Suite
EO Imager
Merrick & Company DACS II
 7216 x 5472 pixel array, Visible
 Field-of-View: 34° degrees
 Ground Resolution @ 2500 ft AGL: 0.07 m
Source: USA
Hyperspectral Imager
AISA Eagle, Hawk, Dual
 Spectral Range: 400-2400 nm (2.9 nm FWHM)
 Field-of-view: 40° degrees
 Ground Resolution @ 2500 ft AGL: 0.60 m
 Includes algorithms to facilitate target
detection and identification
Source: Finland
3D Imaging Laser
Leica ALS50-II+ Airborne LiDAR
 Ground Resolution @ 2500 ft
AGL: 1.31 m
 Scan Angle Range: 45° degrees
 Scan Rate: 5 – 160 scans/second
 Eye safe operation above 200 m
Source: Switzerland
Thermal Imager
ITRES TABI 320
 Spectral Range: 8-12 µm
 Field-of-View: 48°
degrees
 Ground Resolution
 @ 2500 ft AGL: 2.12 m
Source: Canada

49. Final
Derived
Raster
and/or
Vector
Products
Spatial Data
Fusion
Engine
Attribute Assignment
Vector Processing
Feature Extraction
Variable Weighting
Object Classification
Multi-Sensor Data Fusion
HSI Imagery HSI Image Classification HSI Image Spatial
Query
Thermal Imagery Thermal Image
Classification
Thermal Image Spatial
Query
EO Imagery EO Image Spatial Query
LiDAR LiDAR Auto Filter LiDAR Spatial Query (3D)
EO Image
Classification

50. The Future of LiDAR and Geospatial Services
Courtesy of Riegl USA

51. The Future of LiDAR and Geospatial Services
Courtesy of Riegl USA

52. The Future of LiDAR and Geospatial Services
2D profile
path
3D i-beam
3D modeling of i-beams with
very accurate elevations are
extracted by extruding the 2D
profile along a path.
Courtesy of Riegl USA

53. The Future of LiDAR and Geospatial Services
Courtesy of Riegl USA

54. Thank You For Your Time