Thermal scanner measurement of canopy temperatures to estimate evapotranspiration

Heilman, J.L. and Kanemasu, E.T. and Rosenberg, N.J. and Blad , B.L. (1976) Thermal scanner measurement of canopy temperatures to estimate evapotranspiration. Remote Sensing of Environment, 5 (1). pp. 137-145.

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Temperatures of soybean (Glycine max L.), sorghum (Sorghum bicolor L.), and millet (Panicum miliaceum L.), measured with a thermalscanner flown at altitudes of 610 and 1220 m, were used in a resistance form of the energy-balance equation to estimateevapotranspiration (ET). Atmospheric attenuation produced errors of 1 to 6 °C in the scannermeasurements. Errors from neglecting emissivity corrections were less than 1.0 °C. A correction procedure relating temperature error to atmospheric precipitable water was applied to the scannermeasurements. Estimates of ET using the corrected temperatures differed from lysimetric measurements by -0.40 to 0.1 7 ly/min. It was found that accurately extrapolating scannermeasurements to ground level was essential for estimating ET.

Item Type: Article
Author Affiliation: Evapotranspiration laboratory, Agronomy Department, Kansasa State University, Manhattan, Kansasa Agriculture Meteorology section, Dept. of Agriculture Engineering, University of Nebraska, Nebraska
Subjects: Atmosperic Science > Climatology
Crop Improvement
Divisions: General
Depositing User: Library ICRISAT-InfoSAT
Date Deposited: 12 Apr 2012 09:31
Last Modified: 12 Apr 2012 09:31
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