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HYPERSPECTRAL CHARACTERISTICS OF CORN PLANTS UNDER DIFFERENT CHLOROPHYLL LEVELS

机译：不同叶绿素水平下玉米植株的超光谱特征

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摘要

Remote sensing of chlorophyll level in corn at V6 growth stage based on spectral measurements has been limited by soil background, changes in cloud cover, and solar angles. Chlorophyll levels at V6 growth stage are a strong indicator of nitrogen status. This article suggests a solution based on an understanding of the hyperspectral characteristics of corn plants at different chlorophyll levels. Hyperspectral characteristics of corn plants with variable chlorophyll levels, under variable cloud cover, and with variable solar angles are presented. The chlorophyll levels were measured using the Minolta 502 chlorophyll meter. Investigation has found that spectral reflectance response patterns (SRRPs) of corn plants at the same chlorophyll level, acquired during cloud cover changes, still show consistent spectral pattern characteristics. The same characteristics were observed for SRRPs acquired as solar angles changed between 0950 and 1450 h. The results suggest that the SRRPs can be used to develop a robust model for predicting chlorophyll in corn at V6 growth stage. Furthermore, a strong correlation was obtained between chlorophyll readings (in SPAD units) and the near infrared/green (NIR/G) ratio (r 2 = 0.94, root mean square error = 1.44 SPAD units) at constant solar irradiance
机译：基于光谱测量的V6生长阶段玉米叶绿素水平的遥感受到土壤背景，云量变化和太阳角度的限制。 V6生长阶段的叶绿素水平是氮状况的有力指标。本文提出了一种基于对不同叶绿素水平下的玉米植物高光谱特征的理解的解决方案。介绍了具有可变叶绿素水平，可变云量和可变太阳角的玉米植物的高光谱特征。使用Minolta 502叶绿素仪测量叶绿素水平。调查发现，在云量变化期间获得的相同叶绿素水平的玉米植株的光谱反射响应模式（SRRP）仍显示出一致的光谱模式特征。对于随太阳角在0950和1450 h之间变化而获得的SRRP，观察到相同的特性。结果表明，SRRPs可用于建立一个稳健的模型，以预测V6生育期玉米中的叶绿素。此外，在以下温度下，叶绿素读数（以SPAD为单位）与近红外/绿色（NIR / G）比（r 2 = 0.94，均方根误差= 1.44 SPAD单位）之间具有很强的相关性。恒定的太阳辐照度

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  • 来源
    《Transactions of the ASABE》 |2002年第3期|p.815-823|共9页
  • 作者

    S. D. Tumbo; D. G. Wagner; P. H. Heinemann;

  • 作者单位

    Siza D. Tumbo , ASAE Member , Graduate Student;

    David G. Wagner , ASAE Member , Assistant Professor;

    and Paul H. Heinemann , ASAE Member Engineer , Professo Department of Agricultural and Biological Engineering, Pennsylvania State University, University Park, Pennsylvania. Corresponding author : David G. Wagner, Dept. of Agricultural and Biological Engineering, 225 Agricultural Engineering Building, Pennsylvania State University, University Park, PA 16802-1909;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Chlorophyll; Nitrogen; Spectral reflectance; Solar angles; Cloud cover;

    机译：叶绿素氮;光谱反射率太阳角云盖;

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