| 光谱学与光谱分析 |
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| Crop Geometry Identification Based on Inversion of Semiempirical BRDF Models |
| ZHAO Chun-jiang1, HUANG Wen-jiang1,2*, MU Xu-han2, WANG Jin-di2, WANG Ji-hua1 |
1. National Engineering Research Center for Information Technology in Agriculture, Beijing 100097, China
2. State Key Laboratory of Remote Sensing Science, School of Geography, Beijing Normal University, Beijing 100875, China |
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Abstract With the rapid development of remote sensing technology, the application of remote sensing has extended from single view angle to multi-view angles. It was studied for the qualitative and quantitative effect of average leaf angle (ALA) on crop canopy reflected spectrum. Effect of ALA on canopy reflected spectrum can not be ignored with inversion of leaf area index (LAI) and monitoring of crop growth condition by remote sensing technology. Investigations of the effect of erective and horizontal varieties were conducted by bidirectional canopy reflected spectrum and semiempirical bidirectional reflectance distribution function (BRDF) models. The sensitive analysis was done based on the weight for the volumetric kernel (fvol), the weight for the geometric kernel (fgeo), and the weight for constant corresponding to isotropic reflectance (fiso) at red band (680 nm) and near infrared band (800 nm). By combining the weights of the red and near-infrared bands, the semiempirical models can obtain structural information by retrieving biophysical parameters from the physical BRDF model and a number of bidirectional observations. So, it will allow an on-site and non-sampling mode of crop ALA identification, which is useful for using remote sensing for crop growth monitoring and for improving the LAI inversion accuracy, and it will help the farmers in guiding the fertilizer and irrigation management in the farmland without a priori knowledge.
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Received: 2008-06-18
Accepted: 2008-09-26
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Corresponding Authors:
HUANG Wen-jiang
E-mail: yellowstar0618@163.com
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