叶冠的热点效应的模型

叶冠的热点效应的模型

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Initial contribute: 2018-12-04

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Affiliation:  
岳天祥编著
Email:  
yue@lreis.ac.cn
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Method-focused categoriesProcess-perspectiveBiological process calculation

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Chinese {{currentDetailLanguage}} Chinese

叶冠的热点效应的模型

 

(1)    Kuusk1985)提出了一个叶冠的接合概率的表达式:

 

 

式中,是冠层中厚度处沿方向的间隙概率;而分别是方向的天顶角和方位角;下标分别定义了光照方向和视角方向;是热点因子,可用下面的公式进行计算。

 

式中,Ross-NilsonG-函数(单位面积叶片在方向上的投影);是区域中的叶面积密度;称为交叉相关函数,这里是叶片的平均线度。

(2)    利用几何光学原理,结合概率的一般表达式也可以表示为(Jupp and Strahler1991):

式中,是在区域中叶片的单面平均面积;是中心在区域的叶沿方向投影到区域中的平均面积,被称为重叠函数,是同一片叶子沿两个方向(即光照方向和视角方向)的投影的重叠的平均面积,在重叠函数的圆盘模型中,,是圆盘的直径。

 

共同的叶片的两个投影集的重叠面积可表示为:

式中,

是参数。

 

(3)    叶片形状对整个冠层的热点效应的影响:整个冠层的交叉相关函数可表示为:

式中,

 

参考文献:

QinWXiang Y:对叶冠的热点效应的模型研究及叶片形状的影响。Remote Sensing of Environment1994,50

How to Cite

《资源环境数学模型手册》 (2018). 叶冠的热点效应的模型, Model Item, OpenGMS, https://geomodeling.njnu.edu.cn/modelItem/97d4a324-dba5-4c4e-b539-beb8410b6748
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Last modifier : 
Mingyuan Li
Last modify time : 
2020-12-21
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Contributor

Initial contribute: 2018-12-04

Co-contributor(s)

Authorship

Affiliation:  
岳天祥编著
Email:  
yue@lreis.ac.cn
Homepage:  
View
Is authorship not correct? Feedback

History

Last modifier : 
Mingyuan Li
Last modify time : 
2020-12-21
Modify times : 
View History

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