Research Papers

Mapping potato crop height and leaf area index through vegetation indices using remote sensing in Cyprus

[+] Author Affiliations
George Papadavid

Cyprus University Of Technology, Department of Civil Engineering and Geomatics, Remote Sensing Laboratory, Limassol, Cyprus

Agricultural Research Institute of Cyprus, Athalassa, Nicosia, 1516 Cyprus

Diofantos Hadjimitsis

Cyprus University Of Technology, Department of Civil Engineering and Geomatics, Remote Sensing Laboratory, Limassol, Cyprus

Leonidas Toulios

NAGREF, Larissa, Greece

Silas Michaelides

Meteorological Service of Cyprus, Nicosia, Cyprus

J. Appl. Remote Sens. 5(1), 053526 (June 01, 2011). doi:10.1117/1.3596388
History: Received January 12, 2011; Revised May 09, 2011; Accepted May 10, 2011; Published June 01, 2011; Online June 01, 2011
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This paper aims to model leaf area index (LAI) and crop height to spectral vegetation indices (VI), such as normalized difference vegetation index (NDVI) and soil adjusted vegetation index (SAVI), and weighted difference vegetation index (WDVI). The intended purpose is to create empirical statistical models to support evapotranspiration algorithms applied under the current conditions in the island of Cyprus. Indeed, a traditionally agricultural area was selected in the Mandria Village in the Paphos District area in Cyprus, where one of the island's main exported crops, potatoes, are cultivated. A GER-1500 field spectroradiometer was used in this study in order to retrieve the necessary spectrum data of the different crops for estimating the VI’s. A field campaign was undertaken with spectral measurements of LAI and crop height using the Sun-Scan canopy analyzer, acquired simultaneously with the spectroradiometric measurements between March and April of 2008 and 2009. Regarding the measurements, the phenological cycle of potatoes was followed. Several regression models have been applied to relate LAI/crop height and the three indices. It was found that the best fitted vegetation index to both LAI and crop height was WDVI. When LAI was regressed against WDVI for potatoes, the determination coefficient (R2) was 0.72, while for crop height R2 reached 0.78. Two Landsat TM-5 images acquired simultaneously during the spectroradiometric and LAI and crop height measurements are used to validate the proposed regression model. From the whole analysis it was found that the modeled results are very close to real values. This fact enables the specific empirical models to be used in the future for hydrological purposes.

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© 2011 Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation

George Papadavid ; Diofantos Hadjimitsis ; Leonidas Toulios and Silas Michaelides
"Mapping potato crop height and leaf area index through vegetation indices using remote sensing in Cyprus", J. Appl. Remote Sens. 5(1), 053526 (June 01, 2011). ; http://dx.doi.org/10.1117/1.3596388


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