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Airborne LiDAR – Traditional Nadir Versus Oblique Perspectives
- 1. www.merrick.com Traditional Nadir Versus Oblique Perspectives Presented to: AGIC Presented on: August 31, 2022 Presented by: Matt Bethel, GISP Director of Operations and Technology with Merrick & Company Airborne LiDAR www.merrick.com
- 2. Historical Nadir Lidar Perspective Exaggerated along track to show scan pattern
- 3. Advancements In LiDAR Scanning Dual Sensors Single Sensor, Dual Scanners Single Sensor, Dual Output Laser, Single Scanner Goals: • Higher usable pulse rate • Better point distribution
- 4. Advancements In LiDAR Scanning Intentionally not to scale to show scan pattern
- 5. Advancements In LiDAR Scanning Intentionally not to scale to show scan pattern
- 6. 6 If nadir airborne LiDAR scanning works well, why consider oblique oriented collection?
- 8. Forward Facing Oblique Collection Perspective
- 9. Rear Facing Oblique Collection Perspective
- 10. Forward and Rear Facing Oblique Collections Perspective
- 11. Nadir and Oblique LiDAR Scanner Types Content courtesy of Riegl USA 2022
- 12. Latest Generation Survey Grade Airborne LiDAR Scanner Types Sensor Manufacturer Single Nadir Scanner Palmer Scanner Multiple Oblique Scanners Fixed Wing Aircraft Teledyne Optech Galaxy T2000 CZMIL SupeNova Galaxy G2 Riegl VQ-780 II-S VQ-580 II VQ-480 II VQ-880-G II VQ-1560 II-S Leica Geosystems TerrainMapper-2 Leica SPL-100 Chiroptera-5 VeriDaaS / L3Harris Geiger Model LiDAR / IntelliEarth Helicopter and / or Unmanned Aircraft Teledyne Optech CL-90 CL-360 Riegl VUX-1LR VUX-1UAV miniVUX-1LR miniVUX-3UAV VUX-240 miniVUX-1DL VQ-840-G VUX-120
- 13. Palmer Conical LiDAR Scanner Video courtesy of L3Harris Corporation - Geiger-mode LiDAR Tech Talk ILMF 2015
- 14. Project Boundary Project Boundary 1 2 1 2 1 2 4 2 4 2 1 2 3 2 3 2 3 2 1 2 4 6 4 6 4 6 4 2 Single Coverage Flight Plan Double Coverage Flight Plan (>50% sidelap) LiDAR Sidelap Options N D
- 15. Foliage Penetration From a Dual Oblique, 55% Sidelap, Fixed Wing LiDAR Flight
- 16. Point Density Comparisons Content courtesy of Riegl USA 2022 Graphic courtesy of Leica Geosystem
- 17. Data examples from a site flown with all three types of LiDAR scanners • Single nadir scanner • Palmer conical scanner flown with double pass configuration (>50% sidelap) • Dual oblique flown with double pass configuration (>50% sidelap) Single and dual oblique scanners will be shown for comparison
- 22. Single Nadir LiDAR Shadowing
- 23. Palmer Conical LiDAR Shadowing
- 24. Single Oblique LiDAR Shadowing
- 25. Dual Oblique Single Pass LiDAR Shadowing
- 26. Dual Oblique Double Pass LiDAR Shadowing
- 27. Nadir LiDAR Above Ground Feature Modelling
- 28. Palmer Conical LiDAR Above Ground Feature Modelling
- 29. Dual Oblique LiDAR Above Ground Feature Modelling
- 30. Power Line and Tower Modelling Nadir LiDAR Palmer Scanner LiDAR Dual Oblique LiDAR
- 31. Nadir LiDAR Above Ground Feature Modelling
- 32. Palmer Conical LiDAR Above Ground Feature Modelling
- 33. Dual Oblique LiDAR Above Ground Feature Modelling
- 34. Scanner Type Summary Nadir airborne scanning lidar Cross hatched, semi-oblique airborne scanning lidar Palmer scanning oblique airborne lidar Great for Not ideal for Great for Not ideal for Great for Not ideal for Open ground modelling Modelling the sides of above ground features Open ground modelling Bathymetric applications Open ground modelling Ground modelling in narrow urban canyons Foliage penetration Bathymetric applications Modelling the sides of above ground features Modelling the sides of above ground features Foliage penetration (depends on tree type) Ground modelling in narrow urban canyons Ground modelling in narrow urban canyons Bathymetric applications Dense foliage penetration Foliage penetration (depends on tree type) Increasing point density with two laser and/or detectors
- 35. Thank You • Matt Bethel • Director of Operations and Technology • Merrick & Company • http://www.merrick.com/Geospatial • [email protected]