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LiDAR Introduction @ #DataWeekend
LiDAR Introduction @ #DataWeekend
LiDAR Introduction @ #DataWeekend
LiDAR Introduction @ #DataWeekend
LiDAR Introduction @ #DataWeekend
LiDAR Introduction @ #DataWeekend
LiDAR Introduction @ #DataWeekend
LiDAR Introduction @ #DataWeekend
LiDAR Introduction @ #DataWeekend
LiDAR Introduction @ #DataWeekend
LiDAR Introduction @ #DataWeekend
LiDAR Introduction @ #DataWeekend
LiDAR Introduction @ #DataWeekend
LiDAR Introduction @ #DataWeekend
LiDAR Introduction @ #DataWeekend
LiDAR Introduction @ #DataWeekend
LiDAR Introduction @ #DataWeekend
LiDAR Introduction @ #DataWeekend
LiDAR Introduction @ #DataWeekend
LiDAR Introduction @ #DataWeekend
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LiDAR Introduction @ #DataWeekend

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https://registrano.com/events/dataweekend-07/

https://registrano.com/events/dataweekend-07/

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  • 1. LIDAR技術與應用介紹 © LIDAR Tech. Co.,Ltd., 2013 LiDAR技術與應用介紹 徐偉城 2013-10-05
  • 2. LIDAR技術與應用介紹 © LIDAR Tech. Co.,Ltd., 2013 Mapping • Surface(ground, water) -> Airborne -> Spaceborne • Sketch -> Analog -> Digital • Digital Map – Vector(Google Map地圖) – Raster(Google Map衛星) – 3D (Google Earth) – … 2
  • 3. LIDAR技術與應用介紹 © LIDAR Tech. Co.,Ltd., 2013 Elevations on Map • Features(point, line, polygon) – Color, Shadow, … • Contour • DTM(Digital Terrain Model, Digital Topography Model) – DEM(Digital Elevation Model) – DSM(Digital Surface Model) – DBM(Digital Building Model) – … 3
  • 4. LIDAR技術與應用介紹 © LIDAR Tech. Co.,Ltd., 2013 DTM for Digital Map • DTM Quality – Resolution(grid size) – Precision – Efficiency • Methods of DTM – Ground survey – Stereo Image processing(Photogrammetry, Satellite) – Synthetic Aperture Radar(SAR) – LiDAR • Airborne LiDAR provides high quality DTM 4
  • 5. LIDAR技術與應用介紹 © LIDAR Tech. Co.,Ltd., 2013 DEM Comparison 5 5m grid1m grid
  • 6. LIDAR技術與應用介紹 © LIDAR Tech. Co.,Ltd., 2013 What is LiDAR • LiDAR(Light Detection And Ranging, Lidar, 光達) – Laser – Range Finder – Scanner • Various type of LiDAR(Laser Scanner) – Handheld: 3D Scanner – Desk:3D Scanner & Printer – Ground:Terrestrial LiDAR – Mobile Mapping System(car, ship, …) – UAV & Airborne LiDAR – Satellite LiDAR – *Atmosphere LiDAR 6
  • 7. LIDAR技術與應用介紹 © LIDAR Tech. Co.,Ltd., 2013 LiDAR on Different Platforms • Ground • Car • Ship • UAV • Airborne 7
  • 8. LIDAR技術與應用介紹 © LIDAR Tech. Co.,Ltd., 2013 GPS Satellite GPS Satellite GPS X Z Y IMU Roll Heading Pitch GPS Base Station EDMI Aircraft position (lat , lon , el) GPS Aircraft orientation (roll , pitch , heading) IMU Range and angle EDMI + = (E , N , h …) Point cloud Components of Airborne LiDAR POS(position and orientaion system)
  • 9. LIDAR技術與應用介紹 © LIDAR Tech. Co.,Ltd., 2013 Airborne LiDAR Characteristics • Dense Point – 1 pt/m2 to 10pt/m2 (sometimes higher) – Multiple Returns with Intensities – Full Waveform • Accurate – Penetrate Vegetation – Vertical:5~15cm – Horizontal:15~50cm (depend on fly height) • High Efficiency – High efficiency of data acquisition and processing – Fewer GCPs – Filtering without measuring • Standard Data Format – Las file (by ASPRS)
  • 10. LIDAR技術與應用介紹 © LIDAR Tech. Co.,Ltd., 2013 Different Point Density density=10 pts/m2 density=1 pts/m2density=2 pts/m2 density=5 pts/m2
  • 11. LIDAR技術與應用介紹 © LIDAR Tech. Co.,Ltd., 2013 Data Acquisition Trajectory Strip adjustment Aerial Photo Combined Separation Satellite Lock/Elevation
  • 12. LIDAR技術與應用介紹 © LIDAR Tech. Co.,Ltd., 2013 Ground Points Filtering 12 Automatic classify and manual editing Correct Error (canopy) Error (mountain ridge)
  • 13. LIDAR技術與應用介紹 © LIDAR Tech. Co.,Ltd., 2013 P.13 Flight lines Intensity Classes Echos Elevation Waveform Attributes of Point Cloud
  • 14. LIDAR技術與應用介紹 © LIDAR Tech. Co.,Ltd., 2013 DEM/DSM Products 14 DEM DSM
  • 15. LIDAR技術與應用介紹 © LIDAR Tech. Co.,Ltd., 2013 DEM/DSM Products DSM shaded reliefDEM shaded relief
  • 16. LIDAR技術與應用介紹 © LIDAR Tech. Co.,Ltd., 2013 Laser Footprint Start Pulse Range and Intensity Measurement Range1 Range2 Range3 Intensity 1 Intensity 3 Intensity 2 Discrete & Full Waveform LiDAR LiDAR Returns(Leica, 2004,2010) Full Waveform Digitizer T1 , I1 Tn , In Laser – Wave length:1064 nm – Power:2~4 watt – Beam Divergence:0.25 ~0.8 mrad – Pulse Rate:50~200 kHz – Classification:Class IV
  • 17. LIDAR技術與應用介紹 © LIDAR Tech. Co.,Ltd., 2013 Advantages of Full Waveform LiDAR 17 Discrete Las Full Waveform Las
  • 18. LIDAR技術與應用介紹 © LIDAR Tech. Co.,Ltd., 2013 空載光達產製數值高程模型技術 介紹
  • 19. LIDAR技術與應用介紹 © LIDAR Tech. Co.,Ltd., 2013 About LIDAR Technology Co. Ltd. • Earth Observations Spaceborne, Airborne & Terrestrial Data Acquisition – Photogrammetry and LiDAR – Hyper-spectrum and Thermal Image • Geo-informations Value-added products and applications – Image Mapping and Interpretation – Various DEM/DSM Products (90m, 30m, 10m, 5m, 1m, 0.1m) – Historical Image and Topography Services • Location Based Services RS/GIS/GPS Development & Consultant Service – 3D Building Model – Disaster Applications – Augmented Reality
  • 20. LIDAR技術與應用介紹 © LIDAR Tech. Co.,Ltd., 2013 P.20 Thank you TEL: 886-3-6589495 MAIL: ianhsu@lidar.com.tw 台北101大樓點雲剖面圖 台北101大樓模型(Google Earth)

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