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中国农学通报 ›› 2021, Vol. 37 ›› Issue (29): 84-91.doi: 10.11924/j.issn.1000-6850.casb2020-0820

所属专题: 玉米

• 资源·环境·生态·土壤·气象 • 上一篇    下一篇

基于农田实景图像的玉米覆盖度估算模型

张东东1(), 周刊社1, 戴睿1, 袁雷1, 王佳锐2, 边多1()   

  1. 1西藏自治区气候中心,拉萨 850000
    2农业农村部规划设计研究院,北京 100125
  • 收稿日期:2020-12-21 修回日期:2021-02-05 出版日期:2021-10-15 发布日期:2021-10-29
  • 通讯作者: 边多
  • 作者简介:张东东,男,1990年出生,河南南阳人,硕士,研究方向:生态农业气象。通信地址:850000 西藏拉萨城关区林廓北路2号 西藏自治区气候中心,Tel:0891-6361095,E-mail: dongdongzhang@zju.edu.cn
  • 基金资助:
    第二次青藏高原综合科学考察研究项目“西藏中西部湖泊群变化及川藏铁路工程区域气候预测技术系统”(2019QZKK0105);西藏自治区重点研发计划项目“气候变化背景下西藏高原季节划分及农业气候资源时空变化特征研究”(XZ202001ZY0023N)

The Estimation Model of Fractional Vegetation Cover of Maize Based on the Real Image of Farmland

Zhang Dongdong1(), Zhou Kanshe1, Dai Rui1, Yuan Lei1, Wang Jiarui2, Bian Duo1()   

  1. 1Tibet Climate Center, Lhasa 850000
    2Chinese Academy of Agricultural Engineering Planning & Design, Beijing 100125
  • Received:2020-12-21 Revised:2021-02-05 Online:2021-10-15 Published:2021-10-29
  • Contact: Bian Duo

摘要:

为实时、准确地获取玉米覆盖度,为玉米长势监测提供科学依据,以农田小气候实景站采集的玉米图像为数据源,利用图像处理技术对玉米图像进行分析处理,结合9种图像颜色指数(NDI、ExG、ExR、ExG-ExR、R-G、G-B、VEG、CIVE、(G-B)/|R-G|),构建了基于图像颜色指数的玉米覆盖度估算模型。结果表明:利用图像颜色指数可以有效估算玉米覆盖度,除颜色指数(G-B)/|R-G|外,其他8种颜色指数估算玉米覆盖度的精度均较高,其中,以VEG为变量的玉米覆盖度估算模型精度最高,预测结果的R2为0.993,RMSE和MAE均最小,分别为0.0270、0.0223。该方法可以有效、快速的提取玉米覆盖度。

关键词: 玉米, 覆盖度, 数字照片, 颜色指数, 估算模型

Abstract:

To acquire the fractional vegetation cover (FVC) of maize on real-time, which could provide a scientific basis for maize growth monitoring, we took the image shot by the digital camera installed in automatic weather observation station as data sources, built FVC estimation models using 9 color vegetation indices of images (NDI, ExG, ExR, ExG-ExR, R-G, G-B, VEG, CIVE and (G-B)/|R-G|) extracted by employing image processing technologies. The results showed that these indices could estimate the FVC of maize effectively with high accuracy except the (G-B)/|R-G|, the vegetative (VEG) was the optimal color vegetation index for estimation of maize FVC. The model with VEG as variable had the highest estimation accuracy for maize FVC, with the highest coefficient of determination (R2), and lowest root mean square error (RMSE) and mean absolute error (MAE) of 0.993, 0.0270 and 0.0223, respectively. The method could be applied to the extraction of crop FVC effectively.

Key words: maize, fractional vegetation cover, digital image, color vegetation index, estimation model

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