Evaluation of different approaches for estimating and mapping crop water status in cotton with thermal imaging

Canopy temperature has long been recognized as an indicator of plant water status, therefore, a high-resolution thermal imaging system was used to map crop water status. Potential approaches for estimating crop water status from digital infrared images of the canopy were evaluated. The effect of tim...

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Bibliographic Details
Published in:Precision agriculture 2010-02, Vol.11 (1), p.27-41
Main Authors: Alchanatis, V, Cohen, Y, Cohen, S, Moller, M, Sprinstin, M, Meron, M, Tsipris, J, Saranga, Y, Sela, E
Format: Article
Language:English
Subjects:
Accuracy
Agricultural production
Agriculture
Analysis
Atmospheric Sciences
Biomedical and Life Sciences
Canopies
Chemistry and Earth Sciences
Computer Science
Cotton
Crops
Energy balance
Estimating techniques
Heat detection
Irrigation
Leaves
Life Sciences
Loam soils
Physics
Remote sensing
Remote Sensing/Photogrammetry
Sensors
Soil Science & Conservation
Statistics for Engineering
Studies
Temperature
Temperature measurement
Vegetation
Water
Water potential
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Summary:Canopy temperature has long been recognized as an indicator of plant water status, therefore, a high-resolution thermal imaging system was used to map crop water status. Potential approaches for estimating crop water status from digital infrared images of the canopy were evaluated. The effect of time of day on leaf temperature measurements was studied: midday was found to be the optimal time for thermal image acquisition. Comparison between theoretical and empirical approaches for estimating leaf water potential showed that empirical temperature baselines were better than those obtained from energy balance equations. Finally, the effects of angle of view and spatial resolution of the thermal images were evaluated: water status was mapped by using angular thermal images. In spite of the different viewing angles and spatial resolution, the map provided a good representation of the measured leaf water potential.
ISSN:1385-2256
1573-1618
DOI:10.1007/s11119-009-9111-7