Tarbiat Modares University (TMU) ECOPERSIA 2322-2700 5 3 2017 09 01 Extraction of Individual Tree Parameters by Using Terrestrial Laser Scanner Data in Hyricanian Forest 1837 1847 17207 EN Iman Pazhouhan Ph.D. Student, Department of Forestry, Faculty of Natural Resources, Tarbiat Modares University, Noor, Iran Akbar Najafi Associate Professor, Department of Forestry, Faculty of Natural Resources, Tarbiat Modares University, Noor, Iran Abolghasem Kamkar Rouhani Associate Professor, Faculty of Mining, Petroleum and Geophysics, Shahrood University of Technology, Shahrood, Iran Javad Vahidi Assistant Professor, Department of Mathematics, Iran University of Science and Technology, Tehran, Iran Journal Article <strong>Background: </strong>In this study for the first time terrestrial laser scanning survey was implemented on upland Hyrcanian forest, through which a and new method was applied to automatically extract DBH and tree position as a necessary step for height calculation and fitting the clustering as a circle.<br> <strong>Materials and Methods:</strong> Tree height extracted by fixing a cylinder around the trees center. The accuracies of these methods were investigated by field measurement. Among 4 shapes fitting algorithm, Monte Carlo had more suitable result to fitting circle in each height above the ground.<br> <strong>Results: </strong>Tree detection rates were 85% for <em>Carpinus betulus</em> and 87% for <em>Diyospyrus lotus</em> with respect to field measurement. R² and RMSE for DBH measurement were 0.98, 2.06 cm for <em>Carpinus betulus</em> and 0.98, 1.26 cm for <em>Diyospyrus lotus.</em> Value of R² and RMSE for height measurement were 0.96, 3.37 meters and 0.93, 3.02 meters for <em>Carpinus betulus</em> and <em>Diyospyrus lotus, </em>respectively<em>.</em><strong> </strong><br> <strong>Conclusions:</strong> The accuracy of DBH by TLS is very suitable, and about the height of trees we extracted underestimated value in comparison to field measurement and that we need to develop more effective algorithms in order to reach more accurate measurement of trees’ height in Hyrcanian forest. https://ecopersia.modares.ac.ir/article_17207_d4151b70cc2dec1acf2b370c56e8baf4.pdf