The Inversion of the Nilson-Kuusk Canopy Reflectance Model, a Test Case
The Inversion of the Nilson-Kuusk Canopy Reflectance Model, a Test Case
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DOI：
10.1109/igarss.1991.579476
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发表时间：
1991-06
期刊：
影响因子：
--
通讯作者：
A. Kuusk
中科院分区：
文献类型：
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作者：
A. Kuusk
Goel-Strebel程序用于Nilson-Kuusk冠层反射率（CR）模型的反演。利用野外测角仪对大麦和三叶草的冠层定向反射率进行了高分辨率的测量。CR测量伴随着模型输入参数的测量。因此，模型计算和测量的CR角分布之间的对应关系，以及叶冠层参数的测定的反演程序的能力进行了同时测试。测量覆盖了冠层的营养生长期。反演结果对大多数参数来说是合理的，在某些情况下也是好的。大麦和三叶草的结构参数的相关系数分别为0.7-0.9和0.6-0.9。大麦叶片光学参数的平均误差为1-3%，三叶草为3-5%。在三叶草估计中，Lsss的成功结果是由于三叶草林分的丛生和测角仪测量的空间平均不足。
The Goel-Strebel procedure is used for the inversion of the Nilson-Kuusk canopy reflectance (CR) model. High resolution measurements of barley and clover canopy directional reflectance in the red spectral region during the vegetative growth were carried out with a field goniometer. The CR measurements were accompanied with the measurements of model input parameters. Thus, the correspondence between model calculations and the measured CR angular distribution, and also the capability of the inversion procedure for the determination of leaf canopy parameters are simultaneously tested. The measurements covered the vegetative growth period of canopies. The results of inversion may be rated as reasonable for most parameters, and as good in some cases. The correlation between the measured and the estimated structural parameters is 0.7-0.9 for barley and 0.6-0.9 for clover. The mean errors of the estimated leaf optical parameters are 1-3% for barley and 3-5% for clover. Lsss successful iesults in clover estimates are due to tha clumping of a clover stand and insufficient spatial averaging of goniometer measurements.