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Study on light condition and space structure in the forest by image analyzes

图像分析研究森林光照条件和空间结构

基本信息

批准号：
07456070
负责人：
TAKEUCHI Kimio
金额：
$ 4.35万
依托单位：
Niigata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07456070/
关键词：
whole sky photograph image analysis tree size forest space structure forest light condition tree regeneration ビデオ画像写真計測樹木位置デジタル写真景観解析風景解析森林構造解析

项目摘要

Takeuchi and Tanaka researched the basic principle and the method to estimate the location, diameter and height through the whole sky photograph. Actually, in Niigata and Mie prefecture, they took whole sky photographs, and examined the measurable factors by using the computer. Concerning location, diameter and height, they found that the image analysis program developed by K.Yamamoto was applicable well. However, some problems still remain in the height measurement.Matsuzaki researched the method to estimate the space structure of forests through still photographs by common 35mm camera. By taking some measurement poles from various angles into pictures, he designed the theory to get three dimensional distance information on a piece of picture. In addition, He aimed to analyze space structure through video images and reached the new concept to calculate tree form based on the branch angles of isolated trees.Kamitani researched the relation between light condition and regeneration situation under various gap sizes, forms, directions on the test plots where artificial gap on the canopy were set in natural broad-leaved forests, and then he introduced the model formula describing the light condition on the forest floor. In addition, concerning beech and other shade tolerant species composing the canopy of beech forests, he described the dependence of survival and growth upon light level and the characteristic of light distribution under artificial gaps, and examined the regeneration possibility of these tree species under gaps.

Takeuchi和Tanaka研究了通过全天空照片估计位置、直径和高度的基本原理和方法。实际上，在新泻和三重县，他们拍摄了整个天空的照片，并使用计算机检查了可测量的因素。关于位置、直径和高度，他们发现K.Yamamoto开发的图像分析程序适用性良好。但在高度测量方面还存在一些问题，松崎研究了通过普通35 mm相机拍摄的静态照片来估计森林空间结构的方法。他设计了一种理论，通过从不同角度将一些测量杆放入图片中，在一张图片上获得三维距离信息。此外，他还通过视频图像分析了空间结构，并提出了根据孤立树木的分支角度计算树形的新概念。神谷在天然阔叶林树冠上设置人工林窗的试验地上，研究了不同林窗大小、形状、方向下光照条件与更新状况的关系，然后他介绍了描述森林地面光照条件的模型公式。此外，关于山毛榉和其他组成山毛榉林冠层的耐荫树种，他描述了生存和生长对光照水平的依赖性以及人工林隙下的光分布特征，并研究了这些树种在林隙下的再生可能性。