| 摘要: |
| 以烟草冠层为例,使用面向对象技术,设计虚拟传感器,以改进蒙特卡罗光线跟踪模型,获得冠层中任意位置的截光率,进而定量分析各参数对模拟结果的影响。试验结果表明:1)初始光线投放密度和冠层结构精度对模型计算结果影响较大;2)在其他参数条件不变时,增加模型跟踪深度,增大天空散射源分布密度将提高模型计算精度。最后,对比了相同时段同一烟草冠层的田间实验和模型计算得到的光合有效辐射三维空间分布,决定系数(R2)达0.98。该研究结果可为蒙特卡罗光线跟踪模型在作物冠层光分布模拟应用中提供参考依据。 |
| 关键词: 光合有效辐射 冠层光分布 光线跟踪 三维计算机图形 虚拟植物 |
| DOI：10.11841/j.issn.1007-4333.2013.06.012 |
| 投稿时间：2013-05-07 |
| 基金项目:中国烟草总公司云南省公司项目(2011YN08); 中国烟草总公司项目(110201102008) |
|
| Parameters in the model of canopy light distributionwith ray tracing approach |
|
HUANG Fan, LAO Cai-lian, XIAO Cui-xia
|
| (College of Information and Electrical Engineering, China Agricultural University, Beijing 100083, China) |
| Abstract: |
| The simulation in distribution of photosynthetically active radiation within plant canopy has a great significance in studying physiological and ecological processes of plant.Monte-Carlo Ray-tracing(MCRT) model is one of the most effective models which are based on computer science to simulate the distribution in virtual plant canopy.The settings of parameters in MCRT model are the key point to improve the reliability of simulation.In order to get the optimal parameters,we designed a kind of virtual sensor to get the interception ratio for validating the simulated 3D PAR distribution with MCRT approach.In this paper,we utilized MCRT model to simulate the distribution of photosynthetically active radiation within tobacco canopy for quantify the impacts of parameters on simulations.Finally,we compared the results between field measurements and simulations to verify the feasibility of MCRT model.The result of this research provided with a reference for MCRTs application in simulating the three-dimensional light distribution in crop canopy. |
| Key words: photosynthetically active radiation canopy light distribution ray tracing three dimensional computer graphic virtual plant |
