LiDAR Technologies at AGRG
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The document summarizes a presentation given by students to their professor on LiDAR technologies used by the Applied Geomatics Research Group (AGRG) for coastal erosion monitoring. It discusses the Optech ILRIS and MDL Dynascan 250S LiDAR systems used by AGRG, including an overview of their specifications and how they were used in scans at the Cape John field site.
LiDAR Technologies at AGRG
- 1. AGRG LiDAR Technologies Cape John Research Site By Daniel Vanasse, Rachel McKenna and Sammy Barnard For: Dr. Tim Webster AGRG 2014
- 2. Topics of Discussion • Introduction–Dan • ILRIS Overview – Dan • Dynascan Overview – Dan • Dynascan Calibration – Rachel • Dynascan Post-Processing – Sammy • CloudCompare with the ILRIS and Dynascan - Rachel • GLS Topcon Laser scanner- Rachel • Conclusion – Sam • Q & A
- 3. Optech’s ILRIS 3D Scanner Costal Erosion Research Assisted with 3D scan of shoreline at Cape John Post-processed data: -geocoded point cloud -converted ASCII files to las files -generated las datasets and grid rasters -created profile views for visual interpretation
- 4. MDL’s Dynascan 250S MDL’s Dynascan S250 Mobile Laser Scanning System Participated in training seminar Aided in the set-up of two vehicle types: Van & ATV -mounting the pod -RTK GPS Created a ‘Coles Notes’ version of the user manual Assisted with the first coastal erosion scans at Cape John
- 5. Optech ILRIS Overview • Owned by the AGRG • Full 3D aspect of coastline surface area • Has a 40 degree by 40 degree field of view • Spatial resolution on the order of a point every 1-5 cm spacing and a vertical precision of 2-cm. Photo: Mapping Coastal Sections using full 3D Digital Laser Scanning Technology to Monitor the Effects of Climate Change
- 6. MDL’s Dynascan S250 General Specifications: Owned by the AGRG Land Vehicle and Marine Vessel LiDAR Single or Multibeam (bathymetric) Laser Scanner Class 1 Eye Safe (FDA / IEC) Maximum range 250m Accuracy of ± 1 cm @ 50m Range resolution 1 cm Scanner FOV 360° Scanner rate 20 Hz (1200rpm) Pulse measurement rate 36 Hz Photo: mdl-laser.com
- 7. MDL’s Dynascan S250 Environment Operates in -10° to +50° C Water and dust resistant Power and Dimensions Power: 12 to 17 volts DC 30W Weight: 11 kgs Size: L595mm x W240mm x H255mm Attitude Accuracy: Azimuth: 0.1° Roll: 0.03° Pitch: 0.03 ° Image: Dynascan Manual RT3005G V_10
- 8. MDL’s Dynascan 250S Horizontal Position Accuracy (RMS) Choice of GNSS receivers RTK accuracy up to 1cm (horizontal)
- 9. AGRG Research The Applied Geomatics Research Group has been monitoring coastal erosion throughout Nova Scotia since the fall of 2010 3 test sites selected include the three shores of Nova Scotia: • Northumberland Strait • Bay of Fundy • Atlantic Ocean Image: Mapping Coastal Sections using full 3D Digital Laser Scanning Technology to Monitor the Effects of Climate Change
- 10. Cape John Field Camp May 15th & 16th Duties included: Set up RTK GPS Assisted with ILRIS bank scans Assembled Dynascan on ATV and record scans. Grilled delicious burgers & sausages
- 11. Inside our tent
- 20. Cape John Background Info Three distinct geomorphic types exist at Cape John (sand dune, bedrock cliff & glacial till) Pictured on the right is an example of the glacial till found at Cape John Note the red driveway markers.
- 21. Cape John Background Info Figure 17 Example from the time-lapse camera system. Top photo is normal “spring” high tide. Bottom photo is the storm surge from Sept. 10, 2010 (1. 41 m). Nova Scotia’s coastlines are dependent on storm surge events Erosion of the coastlines are affected by: - storm water levels - wind direction and waves - local bathymetry - relief, orientation and composition Photo: Mapping Coastal Sections using full 3D Digital Laser Scanning Technology to Monitor the Effects of Climate Change
- 22. How does LiDAR tie into this?
- 24. Optech ILRIS Overview • ILRIS does not directly geocode scans • Minimum of 4 targets are placed in each scan • Each target’s location is measured using RTK GPS
- 26. Optech ILRIS Overview • Target are located in the point cloud • Used as control points with GPS coordinates • Georeferenced point clouds can produce detailed elevation grids • Used for change detection and visualization.
- 27. Optech ILRIS Overview • ILRIS does not directly geocode scans • Minimum of 4 targets are placed in each scan • Each target’s location is measured using RTK GPS
- 28. Optech ILRIS Overview Point cloud representing elevation of Ilris scans with transect lines.
- 29. Optech ILRIS Overview Elevation raster and transect lines in ArcMap.
- 30. Optech ILRIS Overview Raster grids of Ilris scan Note the white areas – no data
- 31. Cape John Glacial Till Bank All Profiles December 2010 – May 2014 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 CGVD28(m) Distance (m) ILRIS LiDAR Bank Profile 1 - Cape John, Nova Scotia Dec16_10 Jan4_11 June5_12 Aug30_13 May15_14
- 32. Cape John Glacial Till Bank All Profiles December 2010 – May 2014 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 CGVD28m Distance (m) ILRIS LiDAR Bank Profile 2 - Cape John, Nova Scotia Dec16_10 Jan4_11 Jun5_12 Aug30_13 May15_14
- 33. Cape John Water Level Record An example of a storm surge event December 21,2010
- 34. Cape John Glacial Till Bank December 21,2010 Storm Event Profiles 0 1 2 3 4 5 6 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 CGVD28(m) Distance (m) Storm Surge Event Profile 1 - Cape John, Nova Scotia Dec16_10 Jan4_11
- 35. Cape John Glacial Till Bank December 21,2010 Storm Event Profiles 0.0 1.0 2.0 3.0 4.0 5.0 6.0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 CGVD28(m) Distance (m) Storm Surge Event Profile 2 - Cape John, Nova Scotia Dec16_10 Jan4_11
- 36. Cape John Glacial Till Bank August 30, 2013 to May 15, 2014 0.0 1.0 2.0 3.0 4.0 5.0 6.0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 CGVD28(m) Distance (m) ILRIS LiDAR Bank Profile 1 - Cape John, Nova Scotia Aug30_13 May15_14
- 37. Cape John Glacial Till Bank August 30, 2013 to May 15, 2014 0.0 1.0 2.0 3.0 4.0 5.0 6.0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 ILRIS LiDAR Bank Profile 2 - Cape John, Nova Scotia Aug30_13 May15_14
- 38. Cape John Glacial Till Bank 5 Year Span December 2010 to May 2014 0.0 1.0 2.0 3.0 4.0 5.0 6.0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 CGVD28(m) Separtion (m) 5 Year Span Profile 1 - Cape John, Nova Scotia Dec16_10 May15_14
- 39. Cape John Glacial Till Bank 5 Year Span December 2010 to May 2014 0.0 1.0 2.0 3.0 4.0 5.0 6.0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 CGVD28(m) 5 Year Span Profile 2 - Cape John, Nova Scotia Dec16_10 May15_14
- 41. Dynascan S250 Mounting The carrier rack for the van The carrier rack for the ATV
- 48. Dynascan S250 Mounting Each rack holds the Dynascan pod with four bolts. Each rack has bolt on the opposite end for the forward antenna.
- 50. Dynascan S250 IMU RT 3000 ``an advanced, precision Inertial and GPS Navigation systems for measuring motion, position and orientation.`` Oxford Technical Solutions RT Config Wizard sets the parametres for the IMU Key parametres; 1. Secondary antenna position and separation distance 2. Initialisation speed Image: oxts.com
- 51. Dynascan S250 IMU Parameters 1. Secondary Antenna -Ensure the position is selected as “Ahead” -Separation is the distance between the GPS pod antenna and the forward mounted GPS antenna.
- 52. Dynascan 250S RT Configuration Dynascan Pod GPS antenna Forward mounted GPS antenna
- 53. Dynascan S250 IMU Parameters 2. Initialisation Speed The value is set for straight line speed to initialise the heading. m/s kph 1 3.6 2 7.2 3 10.8 4 14.4 5 18 10 36
- 54. Dynascan S250 Operations run in real-time with RTK corrections received Post processing is an option
- 56. Dynascan S250 Initialisation & Warm-Up Phase Once RT Config parametres are set the vehicle must be driven for approximately 15 minutes to warm-up the IMU. Important considerations: • Drive in a straight line until initialisation speed is reached • Speed up and slow down • Make figure 8`s and various turns • Never go in reverse
- 58. Dynascan S250 Enginuity The Performance window indicates how well the IMU is performing. • RTK receiving status • Position Update • Velocity Update • Attitude Update • Will only populate after the initialisation speed has been reached Considerations: • Velocity • Sig
- 59. Dynascan S250 Qinsy Open Qinsy to begin recording data • Setup • Select template (coordinate system - NAD83 UTM20
- 60. Dynascan S250 Qinsy • Go Online and create a new job for your survey
- 61. Dynascan S250 Qinsy Online Windows
Editor's Notes
- #6: Owned by the AGRG Full 3D aspect of coastline surface area Has a 40 degree by 40 degree field of view Spatial resolution on the order of a point every 1-5 cm spacing and a vertical precision of 2-cm.
- #27: Target are located in the point cloud Used as control points with GPS coordinates A first order polynomial transformation is used to convert the point cloud data to UTM NAD83 zone 20 horizontal coordinates and the elevations are referenced to CGVD28.