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Tree Number Estimation with the Use of Vhr Natural Colour Orthophotos Over a Heterogeneous Landscape in Northern Greece : Volume Xl-7/W3, Issue 1 (29/04/2015)

By Stournara, P.

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Book Id: WPLBN0004015965
Format Type: PDF Article :
File Size: Pages 4
Reproduction Date: 2015

Title: Tree Number Estimation with the Use of Vhr Natural Colour Orthophotos Over a Heterogeneous Landscape in Northern Greece : Volume Xl-7/W3, Issue 1 (29/04/2015)  
Author: Stournara, P.
Volume: Vol. XL-7/W3, Issue 1
Language: English
Subject: Science, Isprs, International
Collections: Periodicals: Journal and Magazine Collection, Copernicus Publications
Historic
Publication Date:
2015
Publisher: Copernicus Publications, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Tsioukas, V., Doxani, G., Tsakiri-Strati, M., Siachalou, S., Stournara, P., & Mallinis, G. (2015). Tree Number Estimation with the Use of Vhr Natural Colour Orthophotos Over a Heterogeneous Landscape in Northern Greece : Volume Xl-7/W3, Issue 1 (29/04/2015). Retrieved from http://worldebooklibrary.com/


Description
Description: Aristotle University of Thessaloniki (AUTH), School of Rural and Surveying Engineering, Thessaloniki, Greece. Spatial explicit knowledge regarding the quantity and the spatial distribution of forest parameters is crucial for sustainable forest management, as well as in fulfilling national reporting needs in the framework of international treaties (i.e. Kyoto Protocol, FAO, EFFIS etc). Especially, tree number which can be used for assessing forest tree density (tree number/ha), is among the most important and laboursome parameters to be measured in the field. The aim of this study is to estimate tree number based on the use of nationwide, freely available, very high spatial resolution orthophotos acquired from Greek National Cadastre and Mapping Agency during the 2007-2009 period. The study area is the University Forest of Taxiarchis, which is located in central Halkidiki, Northern Greece. The dominant species of the forest includes both broadleaves (oak, beech) and coniferous species (Black pine, Calabrian pine), which are found in both pure and mixed stands. Tree crown detection was tested on natural color orthophoto bands in several plots. The principal components and intensity-hue-saturation transformations were also applied in order to enhance tree detection accuracy. Local maxima technique was utilized for tree crown detection. Accuracy results were evaluated based on field plot data available from the official forest management plan of the area completed in 2011. Overall, the detection accuracy exceeded 50% which is deemed satisfactory considering also the heterogeneity of the Mediterranean landscape and the limited spectral resolution of the remote sensing data available.

Summary
Tree number estimation with the use of VHR natural colour orthophotos over a heterogeneous landscape in northern Greece


 

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