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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 [email protected]. Outline. Introduction to Airborne Laser Scanning (ALS) - PowerPoint PPT Presentation
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Airborne LiDAR for forest mapping
Poate Degei1, Fabian Enßle², Wolf Forstreuter1 Barbara Koch²1SPC/SOPAC GIS/RS
²Department of Remote Sensing and Landscape Information Systems - FeLIS
21.04.23
27.11.2012 – 30.11.2012 PACIFIC GIS/RS USER CONFERENCE 2
• Introduction to Airborne Laser Scanning (ALS)
• ALS data recorded at Nadi
• Various capabilities of LiDAR data
• TreesVIS software
• Summary & Conclusion
Outline
21.04.23
27.11.2012 – 30.11.2012 PACIFIC GIS/RS USER CONFERENCE 3
• 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
Airborne Laserscanning (ALS)
Source: http://www.riegl.com
21.04.23 27.11.2012 – 30.11.2012 PACIFIC GIS/RS USER CONFERENCE 4
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
LILLESAND ET AL. 2008
TSOULIS 2006
C. Brenner ISPRS Summer school 2006
Airborne Laserscanning (ALS)
21.04.23 27.11.2012 – 30.11.2012 PACIFIC GIS/RS USER CONFERENCE 5
Airborne Laserscanning (ALS)
21.04.23
27.11.2012 – 30.11.2012 PACIFIC GIS/RS USER CONFERENCE 6
First ALS data recorded in Viti Levu
ALS data flight in Nadi area
• A subset is used in next slides
• Financed by World Bank
• May, 2012
• Island Hoppers helicopter
• Light Detection & Ranging
equipment
Demonstration area
21.04.23 27.11.2012 – 30.11.2012 PACIFIC GIS/RS USER CONFERENCE 7
Bird view
A B
Look from Mark B towards A
Airborne Laserscanning (ALS)
Cross section between mark A and mark B (depth 5m)
21.04.23 27.11.2012 – 30.11.2012 PACIFIC GIS/RS USER CONFERENCE 8
Airborne Laserscanning (ALS)
Calculation of Digital Terrain Models (DTM)
21.04.23 27.11.2012 – 30.11.2012 PACIFIC GIS/RS USER CONFERENCE 9
Airborne Laserscanning (ALS)
Calculation of Digital Surface Models (DSM)
21.04.23 27.11.2012 – 30.11.2012 PACIFIC GIS/RS USER CONFERENCE 10
Airborne Laserscanning (ALS)
normalized DSM (nDSM)
• Height of objects
• Vegetation
• Buildings
21.04.23 27.11.2012 – 30.11.2012 PACIFIC GIS/RS USER CONFERENCE 11
Airborne Laserscanning (ALS)
Inclination (surface slope) calculation
• Precise DTM‘s important
• Accessibility to forests
• Environmental modeling
• Soil erosion
• Water drainage
12
Assessment of multilayer structure within the vegetation
Wang et al. 2007 FeLis Double layer forest stand
Single layer forest stand with trees of mixed height
09.11.2010 27.11.2012 – 30.11.2012 PACIFIC GIS/RS USER CONFERENCE
Airborne Laserscanning (ALS)
21.04.23 13
Assessment of canopy closure and height
Airborne Laserscanning (ALS)
27.11.2012 – 30.11.2012 PACIFIC GIS/RS USER CONFERENCE
Example from a German forest (by Christoph Straub)
• Forest segmentation
• By height
• Canopy closure
• Species composition
14
3D real-time visualisation
Calculation of DSM, DTM, nDSM
True orthophoto calculation
Processing and filtering of raw data
Modules for object extraction
Combining TLS and ALS data
Laser flight simulation
TreesVIS – Software skills
09.11.2010
• Data processed with TreesVIS
• Developed at Dep. of Remote
Sensing; University Freiburg
• Special prices for research and
students
27.11.2012 – 30.11.2012 PACIFIC GIS/RS USER CONFERENCE
21.04.23 27.11.2012 – 30.11.2012 PACIFIC GIS/RS USER CONFERENCE 15
Summary & Conclusion
Various capabilities 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
21.04.23 27.11.2012 – 30.11.2012 PACIFIC GIS/RS USER CONFERENCE 16
Thank you for your attention
The authors are greatful to:
The ReCover consortium within the FP7 programme (no. 263075)
http://www.vtt.fi/sites/recover/?lang=en
Vinaka Vakalevu