Identifying individual trees and delineating their canopy structures from the forest point cloud data acquired by an airborne LiDAR (Light Detection And Ranging) has significant implications in forestry inventory. Once accurately identified, tree structural attributes such as tree height, crown diameter, canopy based height and diameter at breast height can be derived. This paper focuses on a n...

breeding based on selection indices is an effective method for improving complex traits such as yield. to assess the efficiency of different selection methods, 50 genotypes of tall fescue (festuca arundinace) were evaluated under two moisture conditions including full irrigation (normal environment) and deficit irrigation (stress environment). the experiment was conducted according to a randomi...

The requirements for up-to-date tree data in city parks and forests are increasing, and an important question is how to keep the digital databases current for various applications. Traditional map-updating procedures, such as visual interpretation of digital aerial images or field measurements using tachymeters, are either inaccurate or expensive. Recently, the development of laser-scanning tec...

Allometric equations for the estimation of tree volume and aboveground biomass in a tropical humid forest were developed based on direct measurements of 19 individuals of seven tree species in Northern Costa Rica. The volume and the biomass of the stems represented about two-thirds of the total volume and total aboveground biomass, respectively. The average stem volume varied between 4 and 11 M...

Inventory on Plantation Monitoring Assessment (PMA) Eucalyptus pellita at the aged of 30 months, measuring total height (h) and diameter breast (dbh). Height measurements were done using Vertex. Measuring a tree whose crown has started to close (overlap) requires more time find highest point tree, it is necessary overcome with tool that estimator model through relationship between (h-dbh). The ...

The diameter at breast height (DBH) and location of trees are important factors when surveying forest resources ecological functions. In this study, a device mainly comprising self-made DBH-measuring instrument positioning base station was used. hardware consisted two devices to simultaneously measure the DBH within sample plot. Specifically, is acquired by processing angle data with an algorit...

In this paper, 3-D laser scanning imaging system was introduced to forestry measurement for data collection. Then the paper discussed the method for stand volume measure and crown measure by the new equipment. There are three methods to measure the stand volumes: using cylindricals and truncated cones to model the tree stem, collecting the point clouds of the tree stem to produce the surface of...

this study aims at assessing the impact of land use change (from forest areas to forest parks) on some silvicultural characteristics of stands under recreational land use in boloran natural forest park, kuhdasht. for this purpose, three zones including non-recreation, extensive recreation and intensive recreation regions were chosen. in each zone 30 sample plots in a systematic random design (1...