Analysis of forest light environments part I. Computerized estimation of solar radiation from hemispherical canopy photographs
Analysis of forest light environments part I. Computerized estimation of solar radiation from hemispherical canopy photographs
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森林光环境分析第一部分：半球形冠层照片太阳辐射的计算机化估计
DOI：
10.1016/0168-1923(89)90018-x
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发表时间：
1989
影响因子：
6.2
通讯作者：
ALAN P. Smith
中科院分区：
文献类型：
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作者：
P. Becker;David Erhart;ALAN P. Smith
本文介绍和评价了一个半自动半球冠层照片分析的微机系统。图像由摄像机从胶片上传送到数字化仪上进行处理。我们的程序根据安德森的方法计算扩散和直接的站点因子（无阻碍辐射的比例）。这些因素是用来估计绝对量的辐射水平，subcrown表面从测量值或估计值在开放。计算的其他指数包括在整个图像和太阳带，基数八分圆，和20个同心环加上潜在的日斑持续时间的频率直方图中的比例开放的树冠。一个小时可以处理20张照片。该计划旨在进行大规模的研究，将植物生物学和分布或动物行为与辐射制度相关联，其中几周或更长的时间尺度是有意义的。不同操作者对每日平均全球辐射的估计的一致性和准确性使得能够进行有意义的站点间比较。
A microcomputer based system for the semi-automatic analysis of hemispherical canopy photos is described and evaluated. Images are transferred from film by a video camera to a digitizer for processing. Our program calculates diffuse and direct site factors (proportions of unobstructed radiation) according to Anderson's methods. These factors are used to estimate absolute amounts of radiation on a horizontal, subcanopy surface from measured or estimated values in the open. Additional indices calculated include the proportion of open canopy in the entire image and in the solar band, the cardinal octants, and 20 concentric rings plus a frequency histogram of potential sunfleck duration. About 20 photos can be processed in an hour. The program was designed for large-scale studies correlating plant biology and distribution or animal behavior with radiation regimes where time scales of several weeks or longer are of interest. Consistency and accuracy of estimates of mean daily global radiation by different operators permit meaningful intersite comparisons.
J.Biol.Chem.260-23。
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