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Combining spatial and spectral information to estimate chlorophyll contents of crop leaves with a field imaging spectroscopy system

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Abstract

Imaging spectroscopy is widely used in weed recognition, pest monitoring, agricultural product quality control and other precision agricultural fields. In the present study, an in-house-designed/developed field imaging spectroscopy system (FISS, 380–870 nm) was used to obtain the imaging spectra of soybean leaves at 344 wavelengths. The spatial and spectral information including the entropy, mean reflectivity and standard deviation of the leaf images at different wavelengths were extracted; the chlorophyll content was retrieved using multiple linear regression (MLR) together with the spatial information and spectral information, and the results were compared with the results derived with the Analytical Spectral Devices (ASD, FieldSpecFR spectrometer, Analytical Spectral Devices Inc., USA) data that were generated using conventional single sensor spectrometers. The results demonstrated that the entropy, standard deviation and other features of the image were very good indicators of the leaf chlorophyll content, confirming the idea that spatial information can be used to retrieve chlorophyll content, with an accuracy equivalent to that of spectral information, and can provide information that spectral reflectivity cannot provide. Thus, integrating spatial information and spectral information can greatly improve the chlorophyll content retrieval accuracy and reduce the estimation errors by 20 %. Due to the unique measurement method and image-spectrum-in-one feature, the field imaging spectroscopy system (FISS) data can be conveniently used to achieve accurate chlorophyll content retrieval, and the retrieval error was reduced by 30–45 % compared with that for the ASD data. FISS data and the proposed method of integrating both spectral and spatial information of imaging spectroscopy have potential advantages in quantitative spectral analysis applied in agricultural biochemistry related fields.

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Acknowledgments

This research was supported by the Natural Science Foundation of Jiang Su Province of China (BK20141091), The National Key Research and Development Plan (2016YFC0502401) and Jiangsu Government Scholarship for Overseas Studies.We thank the anonymous reviewers and editor for their constructive comments and suggestions on our manuscript. Their comments help greatly to improve the quality of this paper.

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Authors and Affiliations

  1. School of Geography and Remote Sensing, Nanjing University of Information Science and Technology, Nanjing, 210044, China

    Bo Liu

  2. Ministry of Environmental Protection, Nanjing Institute of Environmental Sciences, Nanjing, 210042, China

    Wenjing Shen

  3. Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, 410125, China

    Yue-min Yue

  4. Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, 100094, China

    Ru Li, Qingxi Tong & Bing Zhang

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  1. Bo Liu
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  2. Wenjing Shen
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  3. Yue-min Yue
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  4. Ru Li
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  5. Qingxi Tong
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  6. Bing Zhang
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Correspondence to Bing Zhang.

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Liu, B., Shen, W., Yue, Ym. et al. Combining spatial and spectral information to estimate chlorophyll contents of crop leaves with a field imaging spectroscopy system. Precision Agric 18, 491–506 (2017). https://doi.org/10.1007/s11119-016-9466-5

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  • DOI: https://doi.org/10.1007/s11119-016-9466-5

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