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Géza Király 1 , Gábor Brolly 1

Airborne Laser Scanning (ALS) data processing and its usage for forest cover and forest stand parameter estimation. Géza Király 1 , Gábor Brolly 1. 1 University of West Hungary Faculty of Forestry Department of Surveying and Remote Sensing H-9400 SOPRON, Bajcsy-Zs u. 4. Methodology 1.

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Géza Király 1 , Gábor Brolly 1

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  1. Airborne Laser Scanning (ALS) data processingand its usage for forest cover and forest stand parameter estimation Géza Király1, Gábor Brolly1 1University of West Hungary Faculty of ForestryDepartment of Surveying and Remote Sensing H-9400 SOPRON, Bajcsy-Zs u. 4.

  2. Methodology 1. • Planning the survey and getting the permission • Execution of the survey • Pre-processing • Filtering • Relative orientation • Absolute orientation • Processing • Digital Surface Model (DSM) • Digital Terrain Model (DTM) • normalised Digital Surface Model (nDSM) RS In Forest Protection and Inventory, Novy Smokovec

  3. Methodology 2. • Forest parameters extraction • Area-based methods • Stand heights • Crown closure • Stem density • Individual tree based methods • Number of single trees • Single tree heights • Crown projection area • Processing of imagery data RS In Forest Protection and Inventory, NovySmokovec

  4. INMEIN project (HUSK/1101/1.2.1/0141)Execution of the survey: 2013.09.08. RS In Forest Protection and Inventory, Novy Smokovec

  5. File (‚Adatlap’) – MH GEOSZ RS In Forest Protection and Inventory, Novy Smokovec

  6. ExecutionPoint density (0 – 40 points/m2) RS In Forest Protection and Inventory, NovySmokovec

  7. Image-based forest cover • ~1900 images have been captured parallel • True-colour images (RGB) • ~10 cm resolution • Mono- and stereo-photogrammetric evaluation RS In Forest Protection and Inventory, NovySmokovec

  8. Relative orientation RS In Forest Protection and Inventory, Novy Smokovec

  9. Digital Elevation Models Digital Surface ModelDSM Digital Terrain ModelDTM Normalised Digital Surface Model – nDSM • Fitting parabola method Adaptive TIN method nDSM = DSM-DTM RS In Forest Protection and Inventory, Novy Smokovec

  10. Digital Surface Model (DSM) • Functional model • Tree height • Single crowns • Semi-continuous surface • Properties • Highest points of the crowns • Smooth surfaces inside the crowns • Drop down to the ground between the crowns • Polynomial Approximation • Approximation • Local point filtering • Maximum 2nd order surfaces RS In Forest Protection and Inventory, NovySmokovec

  11. Digital Terrain Model (DTM) RS In Forest Protection and Inventory, Novy Smokovec

  12. Normalised Digital Surface Model (nDSM) and its detail RS In Forest Protection and Inventory, Novy Smokovec

  13. Normalised Digital Surface Model, Canopy Height Model (nDSM – CHM) where: V: Volume of the stand (m3) Fc: form number for crown projection area Gc: Sum of crown projection area (m2) H: average stand height (m) RS In Forest Protection and Inventory, Novy Smokovec

  14. Segmentation of the crowns • Inverse watershed modelling • Jenson and Domingue 1988 • Gougeon 1995 • Hyyppä, Inkinen 1999 • Sinkpoints -> tip • Watershed -> crown RS In Forest Protection and Inventory, Novy Smokovec

  15. ResultsForest stand height • Distribution of the relative heights of the points • 90% perc: • 29.25 m (39 m/34 m) • Delineation of sub-stands RS In Forest Protection and Inventory, Novy Smokovec

  16. ResultsCrown-closure RS In Forest Protection and Inventory, Novy Smokovec

  17. ResultsDelineation of sub-stands RS In Forest Protection and Inventory, Novy Smokovec

  18. ResultsNumber of trees • Old stand: • 383 (227) • Reforestation: • 582 (100) RS In Forest Protection and Inventory, Novy Smokovec

  19. ResultsVolume RS In Forest Protection and Inventory, Novy Smokovec

  20. Reference measurements • 2014.04.03 • Kisbodak • 18P • 19C • 19E • National Forest Inventory method • Terrestrial Laser Scanning • Field Survey (ERTI) RS In Forest Protection and Inventory, NovySmokovec

  21. Further tasks • Reference data collection and processing • Form-number determination for poplar stands • Combination of Laser Scanning data with imagery data for improving automatic forest cover maps and forest parameters determination RS In Forest Protection and Inventory, NovySmokovec

  22. Acknowledgements: INMEIN - HUSK/1101/1.2.1/0141 Thanks for Your Attention!Further info: kiraly.geza@emk.nyme.hu RS In Forest Protection and Inventory, Novy Smokovec

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