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| Estimating the crop leaf area index using hyperspectral remote sensing |
| LIU Ke, ZHOU Qing-bo, WU Wen-bin, XIA Tian, TANG Hua-jun |
1、Key Laboratory of Agri-Informatics, Ministry of Agriculture, Beijing 100081, P.R.China
2、Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China
3、College of Urban & Environmental Sciences, Central China Normal University, Wuhan 430079, P.R.China |
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摘要 The leaf area index (LAI) is an important vegetation parameter, which is used widely in many applications. Remote sensing techniques are known to be effective but inexpensive methods for estimating the LAI of crop canopies. During the last two decades, hyperspectral remote sensing has been employed increasingly for crop LAI estimation, which requires unique technical procedures compared with conventional multispectral data, such as denoising and dimension reduction. Thus, we provide a comprehensive and intensive overview of crop LAI estimation based on hyperspectral remote sensing techniques. First, we compare hyperspectral data and multispectral data by highlighting their potential and limitations in LAI estimation. Second, we categorize the approaches used for crop LAI estimation based on hyperspectral data into three types: approaches based on statistical models, physical models (i.e., canopy reflectance models), and hybrid inversions. We summarize and evaluate the theoretical basis and different methods employed by these approaches (e.g., the characteristic parameters of LAI, regression methods for constructing statistical predictive models, commonly applied physical models, and inversion strategies for physical models). Thus, numerous models and inversion strategies are organized in a clear conceptual framework. Moreover, we highlight the technical difficulties that may hinder crop LAI estimation, such as the “curse of dimensionality” and the ill-posed problem. Finally, we discuss the prospects for future research based on the previous studies described in this review.
Abstract The leaf area index (LAI) is an important vegetation parameter, which is used widely in many applications. Remote sensing techniques are known to be effective but inexpensive methods for estimating the LAI of crop canopies. During the last two decades, hyperspectral remote sensing has been employed increasingly for crop LAI estimation, which requires unique technical procedures compared with conventional multispectral data, such as denoising and dimension reduction. Thus, we provide a comprehensive and intensive overview of crop LAI estimation based on hyperspectral remote sensing techniques. First, we compare hyperspectral data and multispectral data by highlighting their potential and limitations in LAI estimation. Second, we categorize the approaches used for crop LAI estimation based on hyperspectral data into three types: approaches based on statistical models, physical models (i.e., canopy reflectance models), and hybrid inversions. We summarize and evaluate the theoretical basis and different methods employed by these approaches (e.g., the characteristic parameters of LAI, regression methods for constructing statistical predictive models, commonly applied physical models, and inversion strategies for physical models). Thus, numerous models and inversion strategies are organized in a clear conceptual framework. Moreover, we highlight the technical difficulties that may hinder crop LAI estimation, such as the “curse of dimensionality” and the ill-posed problem. Finally, we discuss the prospects for future research based on the previous studies described in this review.
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Received: 27 November 2014
Accepted:
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| Fund: This work is partially financed by the National High-Tech R&D Program of China (2012AA12A304) and the National Natural Science Foundation of China (41271112 and 41201089). |
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Corresponding Authors:
ZHOU Qing-bo, Tel: +86-10-82106237,E-mail: zhouqingbo@caas.cn; TANG Hua-jun, Tel: +86-10-82105070, E-mail: tanghuajun@caas.cn
E-mail: zhouqingbo@caas.cn;tanghuajun@caas.cn
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| About author: LIU Ke, Tel: +86-17780637083, E-mail: billc_st@163.com; |
Cite this article:
LIU Ke, ZHOU Qing-bo, WU Wen-bin, XIA Tian, TANG Hua-jun.
2016.
Estimating the crop leaf area index using hyperspectral remote sensing. Journal of Integrative Agriculture, 15(2): 475-491.
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