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Dendrochronological analysis of large tropical trees: a new approach combining photogrammetry, image processing and GIS tools
Latte, Nicolas; Bauwens, Sébastien; Bonnet, Stéphanie et al.
20149th International Conference on Dendrochronology
 

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Keywords :
tropical trees; tree-ring research; technological developments
Abstract :
[en] Tree-ring analysis of tropical trees is especially time-consuming for the largest trees. Because of large dimensions and irregular shapes, the tree-ring measurements are generally achieved (semi-)manually directly from wood samples. The aim of this study is to present a new approach of tree-ring measurements combining photogrammetry, image processing and GIS tools that is appropriate for very large wood samples. Disks are sawed from felled trees above buttress. Small diameters holes are drilled to the disk surface to be later used as control points. Images are taken with an off-the-shelf camera and assembled with PhotoScan in order to produce an orthoimage of the green disk surface. After drying, disks are sanded (grain 80-400) and scanned with a flatbed scanner (A3 size) at high resolution (1200-2400 dpi). The scans are then mosaicked together with Autopano into one single image. Based on the control points of the green orthoimage, the ‘dry’ image is georeferenced and rectified. Using a GIS environment, tree-rings are delimited and ring widths and/or areas measured. Disks are entirely digitalized into high resolution images (0.02-0.04mm per pixel) offering a wide range of analysis possibilities. The image-based procedure reduces cost of disk handling and transportation, facilitates data processing and transfer and, is adaptable to any type of wood samples.
Research center :
Unit of Forest and Nature Management (Gembloux Agro-Bio Tech)
Disciplines :
Environmental sciences & ecology
Author, co-author :
Latte, Nicolas ;  Université de Liège - ULiège > Forêts, Nature et Paysage > Gestion des ressources forestières et des milieux naturels
Bauwens, Sébastien  ;  Université de Liège - ULiège > Forêts, Nature et Paysage > Laboratoire de Foresterie des régions trop. et subtropicales
Bonnet, Stéphanie ;  Université de Liège - ULiège > Forêts, Nature et Paysage > Gestion des ressources forestières et des milieux naturels
Lejeune, Philippe ;  Université de Liège - ULiège > Forêts, Nature et Paysage > Gestion des ressources forestières et des milieux naturels
Fayolle, Adeline  ;  Université de Liège - ULiège > Forêts, Nature et Paysage > Gestion des ressources forestières et des milieux naturels
Language :
English
Title :
Dendrochronological analysis of large tropical trees: a new approach combining photogrammetry, image processing and GIS tools
Publication date :
17 January 2014
Event name :
9th International Conference on Dendrochronology
Event place :
Melbourne (Convention and Exhibition Centre), Australia
Event date :
from 13-01-2014 to 17-01-2014
Audience :
International
Available on ORBi :
since 29 January 2014

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