نتایج جستجو برای: tree height
تعداد نتایج: 265995 فیلتر نتایج به سال:
One of the most important issues in forest biometrics is the use of allometric functions to estimate the tree height by using diameter-height models. Measuring the total height of trees is usually a complex and time-consuming process. In allometric functions, the diameter is measured directly but the height of the tree is an estimate of an allometric model, which will be more accurate if the cr...
A study on evaluation of sapota genotypes collected from different parts of India was carried out at the Department of Fruit Crops, Horticultural College and Research Institute, Periyakulam during the year 2008-2009. Observation on quantitative traits viz., tree height (m), canopy spread (m), number of fruits/tree, mean fruit weight (g) and yield of fruits/tree (kg) were recorded. In addition, ...
In this paper, a method to evaluate queries in document databases is proposed. The main idea of this method is a new top-down algorithm for tree-inclusion. In fact, a path-oriented query can be considered as a pattern tree while an XML document can be considered as a target tree. To evaluate a query S against a document T, we will check whether S is included in T. For a query S, our algorithm n...
Tree detection and tree crown delineation from Airborne LiDAR has been focusing mostly on utilizing the canopy height model (CHM). This paper presents a method for individual tree crown delineation based on densities of high points (DHP) from the high resolution Airborne LiDAR. The DHP method relies on the fact that the density of received laser pulses above a certain height is high at the cent...
Tree is a best data structure for data storage and retrieval of data whenever it could be accommodated in the memory. At the same time, this is true only when the tree is height-balanced and lesser depth from the root. In this paper, we propose a sorting based new algorithm to construct the Balanced search tree from Binary Search Tree with minimum of one rotation for the given elements n >14. I...
The aim was to investigate the relations between diameter at breast height and maximum crown diameter, tree height and other possible independent variables available in stand databases. Altogether 76 models for estimating stem diameter at breast height and 60 models for tree age were formulated using height and maximum crown diameter as independent variables. These types of models can be utiliz...
Savannas are tropical formations in which trees and grasses coexist. According to the "honeycomb rippling model", inter-tree competition leads to an effect of trees growing and dying due to competition, which, at fine spatial scale, would resemble honeycomb rippling. The model predicts that the taller the trees, the higher the inter-tree distances and the evenness of inter-tree distances. The m...
acquisition field reference data using conventional methods due to limited and time-consuming data from a single tree in recent years, to generate reference data for forest studies using terrestrial laser scanner data, aerial laser scanner data, radar and Optics has become commonplace, and complete, accurate 3D data from a single tree or reference trees can be recorded. The detection and identi...
The present research was conducted to find the influence of some topographic factors on distribution of large-leaved lime (Tilia platyphyllos Scop.) and its natural regeneration characteristics in "Vaz" forest (northern Iran). After identification of site and preparation of topography map, selective sampling method was carried out for tree inventory in plots. The sample plots were circular in 1...
The objective of the “Tree Extraction” project organized by EuroSDR (European Spatial data Research) and ISPRS (International Society of Photogrammetry and Remote Sensing) was to evaluate the quality, accuracy, and feasibility of automatic tree extraction methods, mainly based on laser scanner data. In the final report of the project, Kaartinen and Hyyppä (2008) reported a high variation in the...
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