3-d scanning for corridor mapping & right of way usage presented by: martin r. stoughton, pls...
TRANSCRIPT
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3-D Scanning for Corridor Mapping & Right of Way Usage
Presented by:
Martin R. Stoughton, PLS
910-520-1655
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Early Data Collection Techniques- How we got here
Timeline of LiDAR Technology
Terminology of LiDAR Technology
Mobile Mapping and AirBorne LiDAR Systems– Limitations of Mobile Mapping– Advantages of Mobile Mapping– Sample Right of Way Project– Other LiDAR Applications– Data Extraction and Software Applications
Quick Outline
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Ancient Past- The Groma
Roman line of sight surveying instrument for straight roads or right angle construction
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Distant Past Lewis & Clark Expedition
Compass and Chain surveys
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Mid 19th Century
Railroads Mapped with Transits and Levels
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Early PhotogrammetryProfessor Thaddeus Lowe ascending in the Intrepid to observe the Battle of Fair Oaks
Earliest known Aerial Photo: 1860 Downtown Boston
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Timeline of Technology
1904: “Telemobiloscope” (first form of RADAR sensor) developed by Christian Huelsmeyer.
1917: Albert Einstein first theorized about the process that makes lasers possible.
1960: Operable laser invented by Theodore Maiman.
1960: The first navigation satellite TRANSIT IB is launched for use by the U.S. Navy to accurately locate ballistic missile submarines and ships.
1969: Scientist measure the distance between the earth and moon.
1978: The first GPS Block I satellite is launched. Block I comprised of 10 developmental satellites launched from 1978 through 1989.
1983: President Ronald Reagan declassifies NAVSTAR; GPS becomes available to civilians.
1990: NAVSTAR GPS becomes operational.
1990s: LiDAR sensors capable of up to 25,000 pulses per second commercially available.
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Terminology
LiDAR Light Detection And Ranging
MTLS Mobile Terrestrial Laser Scanning
MMS Mobile Mapping System
3dLS 3d Laser Scanning
LAS LiDAR native file format
Point Cloud All XYZ points captured with LiDAR sensor
Classified Point Cloud Point Cloud classified, typically includes (at minimum) Ground and Other
Intensity Strength of reflectivity of returning pulse, recorded as a numerical value and converted to 8-bit image
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Mobile LiDAR Platforms Mobile LiDAR Platforms
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Mobile Mapping Mobile Mapping SystemSystem
Mobile Mapping Mobile Mapping SystemSystem
LiDAR Sensors
• 2 GPS units
• Inertial Measurement Unit (IMU)
• Distance Measurement Instrument (DMI)
• 2 Digital Cameras
• 2 LiDAR Scanners
• Each collecting 200,000 points per second
• Mounted to collect all data in a single pass
• 360 degree field of view
IMU
GPS Antenna
DMI
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Aerial LiDAR Platforms
Reigl 680i LiDAR
Onboard GPS
Inertial Measurement Unit
Lidar Sensor
•Intensity
•Multiple Return
Ground based GPS
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Gimbal Video
TASE 150TASE stabilized camera gimbals are designed to support the aerial oil/gas pipeline and electrical transmission and distribution inspection mission. Pipeline and power line owners rely on airborne imaging to identify and document issues along their property right-of-way.
Using high-quality daylight and thermal imagery, TASE gimbals provide a reliable asset for airborne inspection of pipeline & power lines for early detection of failure points, right-of-way monitoring, vegetation management, supplementing LiDAR operations, storm response and recovery, as well as pipeline leaks or oil spills.
Conductor from 524 ft away
Short Wave Infrared (SWIR)
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• Line-of-Sight
• Traffic
• Topography
• Weather Considerations
• Rain
• Fog
• Standing Water
• Sky-line Visibility
• Urban Canyons
• Steep Terrain
Limitations of Mobile Scanning
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Advantages of Mobile Scanning
• Safety
• Schedule
• Survey Grade Accuracy
• Data extracted with calibrated photos
• Cost Effective because more efficient data collection equates to cost saving
• “Scan in the Can” lends to future data extraction without further field visits
• Video & Imagery
• Deliverables in standard formats
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Data Collection Field to Finish
3 Phases
Phase 1 – Field Collection and Initial Processing
Phase 2 – Post Process to Project Datum
Phase 3 – Extraction and Mapping
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Software Programs
Phase 1 – Field Collection
PosView
Lynx Survey
PosPac
DashMap
DiskExtract
ImageExtract
QT Modeler
Decode32
LynxView
PhotoLapse 3
GPS Software
Phase 2 – Post Processing
Microstation
TerraScan
TerraMatch
TerraPhoto
CorpsCon 6.0
UltraEdit
Phase 3 – Extraction/Mapping
Cyclone
TopoDOT
Virtual Geomatics
TerraSolid
ESRI
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Project WorkflowRaw Data to LAS Files
Final LAS Files
Phase II
Ground Scan-to-Scan Corrections
Phase I
Known Tie Line Corrections
Tiles – Raw
In Local Project DatumTiles – Raw
In State Plane Grid
Initial Process to UTM Coordinate
(Source Files)
Raw Data(20 GB)
If Local
System
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Purpose of Project
Provide on-site positional references of the corridor boundary for future railroad engineering and planning.
Encourage use of edge of corridor monumentation for safety reasons, in lieu of track centerline.
To establish permanent railroad corridor monumentation, thereby reducing track shift errors associated with future improvements.
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Railroad Corridor
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Extracting Centerline Data
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Extracting Centerline Data
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Extracting Centerline Data
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ROW Encroachments
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ROW Monumentation
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Mobile Scanning – Rail Corridors
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Sample ApplicationsSample ApplicationsSample ApplicationsSample Applications
Survey Grade Accuracy Engineering topographic surveys As-built surveys Structures and bridge clearance surveys Deformation surveys Forensic surveys
Mapping Grade Accuracy Corridor study and planning surveys Asset inventory and managementEnvironmental SurveysSight distance analysisEarthwork SurveysUrban mappingCoastal zone erosion analysis
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Utility LocationUtility Location
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Asset Inventory
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RoadwaysRoadways
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Beach ProjectsBeach Projects
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BridgesBridges
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RailroadsRailroads
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Software Application to Simulate Flood
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Data ExtractionGIS Application
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Data ExtractionRoadway Application
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Data ExtractionSign Inventory
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Data ExtractionSign Inventory
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Data ExtractionUtility Inventory
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3D Scanning (As-built Surveys)
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Example CAD Deliverables
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Questions & Answers