Evaluation of palm trees water availability using remote thermal imaging

Y. Cohen; V. Alchanatis; A. Levi; V. Soroker; A. Prigojin; Y. Cohen

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Evaluation of palm trees water availability using remote thermal imaging

In: Precision agriculture '09

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Y. Cohen

Y. Cohen
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V. Alchanatis

V. Alchanatis
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A. Levi

A. Levi
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V. Soroker

V. Soroker
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A. Prigojin

A. Prigojin
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Y. Cohen

Y. Cohen
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Type:: Chapter

Pages:: 159–166

DOI:: https://doi.org/10.1163/9789086866649_020

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Abstract

Thermal images of date palm trees (Phoenix dactylifera L., cv. Medjool) under two irrigation levels (commercial and 80% deficit) were acquired from an elevated stage reaching about 5m above the trees canopy. Leaf temperature of single trees canopy was extracted from the thermal images. The temperature of the commercial irrigation level was lower than that of the water stressed palms by 2-3 degrees. Based on these results airborne thermal images were acquired over a number of palm orchards along the Jordan valley. In 4 of the orchards, two irrigation levels were applied (commercial and 80% deficit). The thermal images were processed to map the canopy temperature of the palm trees. First, palm trees canopy was extracted mainly from soil. A watershed image processing algorithm was employed to find the low temperature sinks that represent the canopy. Then, binary image was transformed to polygons of canopy outlines. A random set of trees (polygons) was selected from each plot, allowing for a minimal distance between the selected trees (calculated by the semivariogram of the original thermal image). Statistical analysis of the temperature of the randomly selected sets revealed that the canopy temperature in the reduced irrigated plots was significantly higher than that of the commercially irrigated one. The results of this work indicate the potential use of airborne thermal images to assess the water availability of individual date palm for site specific irrigation management.

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Precision agriculture '09

E-Book ISBN:: 9789086866649

Publisher:: Wageningen Academic

Print Publication Date:: 01 Jan 2009

Subjects
- Life Sciences
  - General
  - Agriculture & Environment

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Evaluation of palm trees water availability using remote thermal imaging

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Precision agriculture '09

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