introduction to static lidar scanning
TRANSCRIPT
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Introduction to StaticLiDAR Scanning
Presented By: Anthony Falbo P.L.S.
September 2020
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LiDAR Scanning Overview
• Scanning background
• Applications
• Strengths
• Weaknesses
• Scanning Examples
Fisher Associates
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LiDAR = light detecting and ranging
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Types of Scanners
• Airborne
Aerial Platform LiDAR
• Terrestrial:
Mobile Ground LiDAR
Used by autonomous vehicles
Cars/boats
Static LiDAR
Set up on tripod
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Airborne Scanners
Gmv.cast.uark.edu
Mobile Terrestrial Scanners
Techcrunch.com
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Static Terrestrial Scanners
Researchgate.net
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Applications
• Land Surveying/Civil Engineering
• Geological/Ecological Monitoring
• City Planning
• Architecture
• Archaeology
• Crime Scene Preservation (Forensic)
• Video Gaming
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Land Survey & Engineering • Structure or Site monitoring
• Retaining walls
• Pavement
• Bridges
• As-Built Surveys
• Historical Preservation
• Interior and exterior of structures
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Geological & Ecological Monitoring• Mining
• Monitor unlined tunnel
• Monitor for support structure deformation
• Analyze hard to reach rock structures
• Slope monitoring
• Measure leaf density of vegetation
• Capture existing stream bank conditions
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Survey Control
• Establish survey control Network of control points – known coordinates
• Can provide different coordinate systems depending on need
Tied to survey control by spheres and checkered scan targets
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Workflow (cont.)
Office
• Process and adjust point cloud
• Classify the point data
Most scan processing software automatically classifies or moves like points to specific feature layers
Before Classification with image overlay.
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Workflow (cont.)• Further review of layers is required
• Create classification layers and classify as necessary
After classification
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Fisher Scanning Examples• Marcy Pedestrian Bridge Forensic Survey
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Fisher Scanning Examples (cont.)• Calspan Helium Tank As-Built Survey
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Fisher Scanning Examples (cont.)• Thurston Avenue Bridge Topographic Survey
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Scanning Examples (cont.)• Exposed Slide Scan
(by others)
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Strengths
• Assurance
Scan data is adjusted to survey control after scans are registered
• Safety
Capture valuable data in areas where field crews may not be able to reach
Elevated platforms, confined spaces, busy roadways, etc.
• Thorough
Generally, no bad shots on break lines or missed features
• Superior to traditional surveying for volume surveys
Gets all bulges and voids
More accurate with dense point clouds.
• Reduces 2nd trips
Point data extends beyond area of interest (data in the can)
Able to pick additional features from point cloud
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Weaknesses
• Reflective Surfaces
• Snow
• Rain
• Vegetation
• More labor intensive in the office, although, the time balances out.
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Questions?
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Sources
• http://floridalaserscanning.com/3d-laser-scanning/how-does-laser-scanning-work/
• https://www.spar3d.com/news/related-new-technologies/time-of-flight-vs-phase-based-laser-scanners-right-tool-for-the-job/
• https://www.researchgate.net/figure/Basic-types-of-terrestrial-3D-laser-scanners-TLS-a-brief-overview-A-Faro-Focus_fig3_322096576
• https://www.pobonline.com/articles/101884-lidar-use-rising-among-surveyors?page=2