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Airborne LiDAR for forest mapping

Airborne LiDAR for forest mapping. Poate Degei1, Fabian Enßle², Wolf Forstreuter 1 Barbara Koch² 1 SPC/SOPAC GIS/RS ²Department of Remote Sensing and Landscape Information Systems - FeLIS fabian.enssle@felis.uni-freiburg.de. Outline. Introduction to Airborne Laser Scanning (ALS)

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Airborne LiDAR for forest mapping

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  1. Airborne LiDAR for forest mapping Poate Degei1, Fabian Enßle², Wolf Forstreuter1 Barbara Koch² 1SPC/SOPAC GIS/RS ²Department of Remote Sensing and Landscape Information Systems - FeLIS fabian.enssle@felis.uni-freiburg.de

  2. Outline • Introduction to Airborne Laser Scanning (ALS) • ALS data recorded at Nadi • Various capabilities of LiDAR data • TreesVIS software • Summary & Conclusion 27.11.2012 – 30.11.2012 Pacific GIS/RS User Conference

  3. Airborne Laserscanning (ALS) • ALS is an active remote sensing technique • Laser scanner can be mounted on airplanes, • helicopters or UAV’s • Laser scanner technology has several advantages • 3D mapping of vegetation • Laser penetrates thru canopy • Principals and data will be described in next slides Source: http://www.riegl.com 27.11.2012 – 30.11.2012 Pacific GIS/RS User Conference

  4. Airborne Laserscanning (ALS) C. Brenner ISPRS Summer school 2006 • Easting Northing Elevation Intensity • 3462486.09 5483534.20 93.74 32 • 3462484.77 5483533.61 93.97 35 • 3462483.42 5483533.01 93.50 74 • 3462482.08 5483532.41 93.50 25 • 3462480.75 5483531.82 93.48 55 • 3462479.44 5483531.23 93.87 94 • 3462478.12 5483530.64 94.02 107 • 3462477.01 5483530.14 97.74 28 • 3462475.51 5483529.47 94.89 58 • 3462474.22 5483528.89 95.49 78 • 3462472.91 5483528.30 95.78 32 • 3462471.57 5483527.71 95.77 25 • 3462470.43 5483527.19 98.49 18 • 3462468.92 5483526.52 95.90 41 Tsoulis 2006 Lillesand et al. 2008 27.11.2012 – 30.11.2012 Pacific GIS/RS User Conference

  5. Airborne Laserscanning (ALS) 27.11.2012 – 30.11.2012 Pacific GIS/RS User Conference

  6. ALS dataflight in Nadiarea First ALS data recorded in VitiLevu • Financed by World Bank • May, 2012 • Island Hoppers helicopter • Light Detection & Ranging • equipment • A subset is used in next slides Demonstration area 27.11.2012 – 30.11.2012 Pacific GIS/RS User Conference

  7. Airborne Laserscanning (ALS) Bird view A B Look from Mark B towards A Cross section between mark A and mark B (depth 5m) 27.11.2012 – 30.11.2012 Pacific GIS/RS User Conference

  8. Airborne Laserscanning (ALS) Calculationof Digital Terrain Models (DTM) 27.11.2012 – 30.11.2012 Pacific GIS/RS User Conference

  9. Airborne Laserscanning (ALS) Calculationof Digital Surface Models (DSM) 27.11.2012 – 30.11.2012 Pacific GIS/RS User Conference

  10. Airborne Laserscanning (ALS) normalized DSM (nDSM) • Height of objects • Vegetation • Buildings 27.11.2012 – 30.11.2012 Pacific GIS/RS User Conference

  11. Airborne Laserscanning (ALS) Inclination (surfaceslope) calculation • Precise DTM‘s important • Accessibility to forests • Environmental modeling • Soil erosion • Water drainage 27.11.2012 – 30.11.2012 Pacific GIS/RS User Conference

  12. Airborne Laserscanning (ALS) Assessment ofmultilayerstructurewithinthevegetation Wang et al. 2007 FeLis Double layer forest stand Single layer forest stand with trees of mixed height 27.11.2012 – 30.11.2012 Pacific GIS/RS User Conference

  13. Airborne Laserscanning (ALS) • Assessment ofcanopyclosureandheight • Forest segmentation • By height • Canopy closure • Species composition Example from a German forest (by Christoph Straub) 27.11.2012 – 30.11.2012 Pacific GIS/RS User Conference

  14. TreesVIS – Software skills 3D real-time visualisation • Data processed with TreesVIS • Developed at Dep. of Remote Sensing; University Freiburg • Special prices for research andstudents Processing and filtering of raw data CalculationofDSM, DTM, nDSM True orthophotocalculation Combining TLS and ALS data Modules forobjectextraction Laser flight simulation 27.11.2012 – 30.11.2012 Pacific GIS/RS User Conference

  15. Summary & Conclusion • Variouscapabilities of LiDAR technology • 3D point information • Precise Digital Surface Models • Precise Digital Terrain Models even under forest canopy • Data is useful for multiple purposes • Forest mapping • Environmental and Disaster modeling/mapping • Urban area mapping (houses, transmission lines) • Data acquisition is expensive, but of high value due to its use for multiple purposes 27.11.2012 – 30.11.2012 Pacific GIS/RS User Conference

  16. Thank you for your attention Vinaka Vakalevu The authors are greatful to: • The ReCoverconsortiumwithinthe FP7 programme (no. 263075) http://www.vtt.fi/sites/recover/?lang=en 27.11.2012 – 30.11.2012 Pacific GIS/RS User Conference

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