A manual for analysis of hemispherical canopy photography
A manual for analysis of hemispherical canopy photography
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半球形冠层摄影分析手册
DOI：
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发表时间：
1989
期刊：
影响因子：
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通讯作者：
P. Rich
中科院分区：
文献类型：
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作者：
P. Rich
半球形树冠摄影涉及通过半球形（鱼眼）透镜从植物树冠下指向上方拍摄照片。由此产生的照片可以进行分析，以确定冠层开口的几何形状，并计算潜在的光穿透。本手册是CANOPY程序的综合指南，CANOPY是一个用于半球形冠层摄影图像分析的公共领域微机程序。包括理论，研究应用，现场方法，硬件设置和操作，软件设置和操作的讨论。CANOPY能够对底片进行视频数字化，实时显示正像，交互式确定区分树叶和树冠开口的阈值，编辑曝光不良的照片，快速计算树冠几何形状的各种测量值和潜在透光指数，并方便输出结果。一系列的实用程序允许用户指定的理论或经验分布的直射阳光和漫射天窗为一个给定的网站。_章
Hemispherical canopy photography involves taking photographs through a hemispherical (fisheye) lens pointed upward from beneath a plant canopy. The resulting photographs can be analyzed to determine the geometry of canopy openings and to calculate potential light penetration. This manual serves as a comprehensive guide to the program CANOPY, a public domain microcomputer program for image analysis of hemispherical canopy photography. Included are discussions of theory, research applications, field methodology, hardware setup and operation, and software setup and operation. CANOPY enables video digitization of negatives, real-time display of positive images, interactive determination of a threshold to distinguish foliage from canopy openings, editing of photographs with poor exposure, rapid calculation of various measures of canopy geometry and indices of potential light penetration, and convenient output of results. A series of utility programs allow user specification of theoretical or empirical distributions of direct sunlight and diffuse skylight for a given site. _____________________________________ CHAPTER