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Towards an Optimized Method of Olive Tree Crown Volume Measurement

Accurate crown characterization of large isolated olive trees is vital for adjusting spray doses in three-dimensional crop agriculture. Among the many methodologies available, laser sensors have proved to be the most reliable and accurate. However, their operation is time consuming and requires spec...

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Autores principales: Miranda-Fuentes, Antonio, Llorens, Jordi, Gamarra-Diezma, Juan L., Gil-Ribes, Jesús A., Gil, Emilio
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4367379/
https://www.ncbi.nlm.nih.gov/pubmed/25658396
http://dx.doi.org/10.3390/s150203671
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author Miranda-Fuentes, Antonio
Llorens, Jordi
Gamarra-Diezma, Juan L.
Gil-Ribes, Jesús A.
Gil, Emilio
author_facet Miranda-Fuentes, Antonio
Llorens, Jordi
Gamarra-Diezma, Juan L.
Gil-Ribes, Jesús A.
Gil, Emilio
author_sort Miranda-Fuentes, Antonio
collection PubMed
description Accurate crown characterization of large isolated olive trees is vital for adjusting spray doses in three-dimensional crop agriculture. Among the many methodologies available, laser sensors have proved to be the most reliable and accurate. However, their operation is time consuming and requires specialist knowledge and so a simpler crown characterization method is required. To this end, three methods were evaluated and compared with LiDAR measurements to determine their accuracy: Vertical Crown Projected Area method (VCPA), Ellipsoid Volume method (V(E)) and Tree Silhouette Volume method (V(TS)). Trials were performed in three different kinds of olive tree plantations: intensive, adapted one-trunked traditional and traditional. In total, 55 trees were characterized. Results show that all three methods are appropriate to estimate the crown volume, reaching high coefficients of determination: R(2) = 0.783, 0.843 and 0.824 for VCPA, V(E) and V(TS), respectively. However, discrepancies arise when evaluating tree plantations separately, especially for traditional trees. Here, correlations between LiDAR volume and other parameters showed that the Mean Vector calculated for VCPA method showed the highest correlation for traditional trees, thus its use in traditional plantations is highly recommended.
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spelling pubmed-43673792015-04-30 Towards an Optimized Method of Olive Tree Crown Volume Measurement Miranda-Fuentes, Antonio Llorens, Jordi Gamarra-Diezma, Juan L. Gil-Ribes, Jesús A. Gil, Emilio Sensors (Basel) Article Accurate crown characterization of large isolated olive trees is vital for adjusting spray doses in three-dimensional crop agriculture. Among the many methodologies available, laser sensors have proved to be the most reliable and accurate. However, their operation is time consuming and requires specialist knowledge and so a simpler crown characterization method is required. To this end, three methods were evaluated and compared with LiDAR measurements to determine their accuracy: Vertical Crown Projected Area method (VCPA), Ellipsoid Volume method (V(E)) and Tree Silhouette Volume method (V(TS)). Trials were performed in three different kinds of olive tree plantations: intensive, adapted one-trunked traditional and traditional. In total, 55 trees were characterized. Results show that all three methods are appropriate to estimate the crown volume, reaching high coefficients of determination: R(2) = 0.783, 0.843 and 0.824 for VCPA, V(E) and V(TS), respectively. However, discrepancies arise when evaluating tree plantations separately, especially for traditional trees. Here, correlations between LiDAR volume and other parameters showed that the Mean Vector calculated for VCPA method showed the highest correlation for traditional trees, thus its use in traditional plantations is highly recommended. MDPI 2015-02-04 /pmc/articles/PMC4367379/ /pubmed/25658396 http://dx.doi.org/10.3390/s150203671 Text en © 2015 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Miranda-Fuentes, Antonio
Llorens, Jordi
Gamarra-Diezma, Juan L.
Gil-Ribes, Jesús A.
Gil, Emilio
Towards an Optimized Method of Olive Tree Crown Volume Measurement
title Towards an Optimized Method of Olive Tree Crown Volume Measurement
title_full Towards an Optimized Method of Olive Tree Crown Volume Measurement
title_fullStr Towards an Optimized Method of Olive Tree Crown Volume Measurement
title_full_unstemmed Towards an Optimized Method of Olive Tree Crown Volume Measurement
title_short Towards an Optimized Method of Olive Tree Crown Volume Measurement
title_sort towards an optimized method of olive tree crown volume measurement
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4367379/
https://www.ncbi.nlm.nih.gov/pubmed/25658396
http://dx.doi.org/10.3390/s150203671
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