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This article in AJ

  1. Vol. 71 No. 3, p. 515-518
     
    Received: Jan 24, 1978


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doi:10.2134/agronj1979.00021962007100030034x

Effect of Surface Winds on the Spectral Signatures of Crops1

  1. V. R. Rao2,
  2. E. J. Brach3 and
  3. A. R. Mack4

Abstract

Abstract

Spectral interpretation of quantitative measurement of the reflected radiation from plants by remote sensing requires consideration of the environmental conditions and structural aspects of the plant under which the measurements were made. Depending on wind speed and direction, it was found that for certain plants, such as cereal crops, radiance fluctuated 10 to 20% more in the 450 to 650 nm than in the 650 to 750 nm range. Wind speeds up to 32 km/hr caused increasingly greater fluctuation for cereal crops than for clipped sod and bare soil. A calibrated grey reference scale showed little effect of wind within the range of speeds observed in this study.

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