• Save
Survey Grade LiDAR Technologies for Transportation Engineering
Upcoming SlideShare
Loading in...5
×
 

Survey Grade LiDAR Technologies for Transportation Engineering

on

  • 1,195 views

This presentation was given during the 2013 Annual Civil Engineering Conference by Tim Stagg of AeroMetric. It covers system/sensor configurations, application advantages/disadvantages, analysis from ...

This presentation was given during the 2013 Annual Civil Engineering Conference by Tim Stagg of AeroMetric. It covers system/sensor configurations, application advantages/disadvantages, analysis from sensor data, feature extraction/deliverables, and client pains in relation to survey grade LiDAR technologies for transportation engineering.

Statistics

Views

Total Views
1,195
Views on SlideShare
569
Embed Views
626

Actions

Likes
0
Downloads
1
Comments
0

5 Embeds 626

http://quantumspatial.com 398
http://www.aerometric.com 214
http://staging.aerometric.com 11
http://feeds.feedburner.com 2
http://webcache.googleusercontent.com 1

Accessibility

Categories

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment
  • Shows how data is capturedShows some of the shadowing deficiencies of the system on the image to the right (Notice only the red area is captured, due to the building block the view at certain angles)
  • Don’t get stuck in the weeds on this slide, here are the take away’sSurvey grade .1 – .2 Vertical, twice that for horizontal (this is good enough for most all projects the DOT will want to do)If they want better we can cut that in half but a the cost of more control and digital levels (Basically defeats a lot of the advantage of using the system)Digital imagery is 1.5 times the pixel imagery, if we should 1” pixels the horizontal is 1.5”

Survey Grade LiDAR Technologies for Transportation Engineering Survey Grade LiDAR Technologies for Transportation Engineering Presentation Transcript

  • WELCOME TO THE ASCE 143RD ANNUAL CIVIL ENGINEERING CONFERENCE Survey Grade LiDAR Technologies for Transportation Engineering
  • Overview • • • • • • System / Sensor Configurations Application Advantages/Disadvantages Analysis from Sensor Data Feature Extraction / Deliverables Client Pains Questions
  • System/Sensor Configurations • Mobile Systems • Helicopter Systems
  • Mobile System Mounting Can be mounted on most platforms easily •SUV •Truck •Rail Car •ATV •Boat Only requires 12 volt power – marine battery- lasts about 7 to 10 hours with out charge.
  • Mobile Sensor Configuration GPS and Inertial Sensors LiDAR Sensor DMI Calibrated Digital Cameras
  • Mobile Mapper System Configurations Minimize laser shadowing-optimize field of view (FOV) • Sensor will see everything behind the vehicle • Sensor will see ~45° in front of vehicle • Full 360° area coverage
  • HAMS LiDAR High Accuracy Mapping System Helicopter or Fixed Wing Trimble AP50 Inertial POS system Equivalent 610 IMU Phase One IXI 80mp Camera – 55mm lens 800 feet – 1in pixel Reigl 480i LiDAR Sensor – 550khz 800 feet – Approx. 32ppm single pass Accuracy – 1 to 2 cm vertically
  • System Advantages/ Disadvantages
  • System accuracies and expected point resolutions • Fixed Wing – Can achieve 5 to 9.25cm vertical 1 to 80 points per meter • Helicopter – 1 to 3 cm vertical accuracy – 40 to 150 points per meter • Mobile – 1 cm or better depending on control – 1000 to 4000 points per meter
  • Mobile System Considerations • GPS receivers are set approximately 16 to 20 miles apart (no more than 8 to 10 miles from receiver to MMS unit) • End data will only be as accurate as the control targets established • For high accuracy vertical projects, digital levels must be established on the targets • Target spacing should average 800’ between point pairs • Targets must be placed within sensor view, i.e. “Roadway”
  • HAM System Considerations • Target spacing should average 1500’ between point pairs • Targets can be placed anywhere within project corridor
  • Application Advantages/Disadvantages • • • • • Multiple Mission Capability Rich datasets Survey coverage limits Accuracies Future data usage
  • Mobile LiDAR Advantages Over Conventional Survey
  • Advantage of Helicopter for Shadowed Vertical Features
  • Advantage of Mobile for Vertical Features
  • HAM Imagery
  • Mobile Mapping Imagery
  • Multiple Data Sources • A high resolution, geo-coded digital imagery is collected with every survey • Use LiDAR and digital photography together to generate true color point clouds automatically from scan data
  • Analysis from Sensor Data
  • Bridge Decking Analysis
  • Pot Hole Detection Cross Section 11” x 21” Pot Hole 2.1 Inches Deep I-55, Hinds County, Mississippi
  • Pavement Joint Failures Joint Failure I-95, Brevard County, Florida
  • Clearance Analysis Vertical Clearance 17.56-Feet Vertical Clearance 22.60-Feet Vertical Clearance 22.43-Feet
  • Slope Analysis Point to Point Slope (Water Flow) • • • • Red – Less than 1% Slope Yellow – 1 - 2% Slope Green – 2 - 4% Slope Cyan – 4 - 20% Slope
  • Slope Analysis Steel Plate Pavement Ruts
  • Slope Analysis
  • Classification of LiDAR Point Cloud
  • Elevation by Intensity Color
  • Feature Extraction
  • Traditional Vector Mapping
  • Asset Mapping
  • Points and Line Work
  • 3D modeling of Bridges
  • Point Cloud Rendering/Modeling
  • Feature Collection – Rail Road Corridor
  • Processed Intensity Image
  • Intensity Image fused with RGB Values
  • Point Cloud data fused with RGB Values
  • Client Pains • • • • Large File Sizes Rich Data Sets Difficulty with work Flow Issues Software always lags behind Hardware
  • Software Solutions • Dashboards for analysis in 3D environment • Point Cloud Software for transportation data • Asset Management Software
  • THANK YOU FOR ATTENDING THE ASCE 143RD ANNUAL CIVIL ENGINEERING CONFERENCE WE LOOK FORWARD TO SEEING YOU NEXT YEAR IN PANAMA! Tim Stagg - AeroMetric Vice President, Transportation Solutions Phone: (410) 310-9534 Email: tstagg@aerometric.com