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A Double Swath Configuration for Improving Throughput and Accuracy of Trait Estimate from UAV Images

Multispectral observations from unmanned aerial vehicles (UAVs) are currently used for precision agriculture and crop phenotyping applications to monitor a series of traits allowing the characterization of the vegetation status. However, the limited autonomy of UAVs makes the completion of flights d...

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Detalles Bibliográficos
Autores principales: Li, Wenjuan, Comar, Alexis, Weiss, Marie, Jay, Sylvain, Colombeau, Gallian, Lopez-Lozano, Raul, Madec, Simon, Baret, Frédéric
Formato: Online Artículo Texto
Lenguaje:English
Publicado: AAAS 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8672205/
https://www.ncbi.nlm.nih.gov/pubmed/34957414
http://dx.doi.org/10.34133/2021/9892647
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author Li, Wenjuan
Comar, Alexis
Weiss, Marie
Jay, Sylvain
Colombeau, Gallian
Lopez-Lozano, Raul
Madec, Simon
Baret, Frédéric
author_facet Li, Wenjuan
Comar, Alexis
Weiss, Marie
Jay, Sylvain
Colombeau, Gallian
Lopez-Lozano, Raul
Madec, Simon
Baret, Frédéric
author_sort Li, Wenjuan
collection PubMed
description Multispectral observations from unmanned aerial vehicles (UAVs) are currently used for precision agriculture and crop phenotyping applications to monitor a series of traits allowing the characterization of the vegetation status. However, the limited autonomy of UAVs makes the completion of flights difficult when sampling large areas. Increasing the throughput of data acquisition while not degrading the ground sample distance (GSD) is, therefore, a critical issue to be solved. We propose here a new image acquisition configuration based on the combination of two focal length (f) optics: an optics with f = 4.2 mm is added to the standard f = 8 mm (SS: single swath) of the multispectral camera (DS: double swath, double of the standard one). Two flights were completed consecutively in 2018 over a maize field using the AIRPHEN multispectral camera at 52 m altitude. The DS flight plan was designed to get 80% overlap with the 4.2 mm optics, while the SS one was designed to get 80% overlap with the 8 mm optics. As a result, the time required to cover the same area is halved for the DS as compared to the SS. The georeferencing accuracy was improved for the DS configuration, particularly for the Z dimension due to the larger view angles available with the small focal length optics. Application to plant height estimates demonstrates that the DS configuration provides similar results as the SS one. However, for both the DS and SS configurations, degrading the quality level used to generate the 3D point cloud significantly decreases the plant height estimates.
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spelling pubmed-86722052021-12-23 A Double Swath Configuration for Improving Throughput and Accuracy of Trait Estimate from UAV Images Li, Wenjuan Comar, Alexis Weiss, Marie Jay, Sylvain Colombeau, Gallian Lopez-Lozano, Raul Madec, Simon Baret, Frédéric Plant Phenomics Research Article Multispectral observations from unmanned aerial vehicles (UAVs) are currently used for precision agriculture and crop phenotyping applications to monitor a series of traits allowing the characterization of the vegetation status. However, the limited autonomy of UAVs makes the completion of flights difficult when sampling large areas. Increasing the throughput of data acquisition while not degrading the ground sample distance (GSD) is, therefore, a critical issue to be solved. We propose here a new image acquisition configuration based on the combination of two focal length (f) optics: an optics with f = 4.2 mm is added to the standard f = 8 mm (SS: single swath) of the multispectral camera (DS: double swath, double of the standard one). Two flights were completed consecutively in 2018 over a maize field using the AIRPHEN multispectral camera at 52 m altitude. The DS flight plan was designed to get 80% overlap with the 4.2 mm optics, while the SS one was designed to get 80% overlap with the 8 mm optics. As a result, the time required to cover the same area is halved for the DS as compared to the SS. The georeferencing accuracy was improved for the DS configuration, particularly for the Z dimension due to the larger view angles available with the small focal length optics. Application to plant height estimates demonstrates that the DS configuration provides similar results as the SS one. However, for both the DS and SS configurations, degrading the quality level used to generate the 3D point cloud significantly decreases the plant height estimates. AAAS 2021-12-06 /pmc/articles/PMC8672205/ /pubmed/34957414 http://dx.doi.org/10.34133/2021/9892647 Text en Copyright © 2021 Wenjuan Li et al. https://creativecommons.org/licenses/by/4.0/Exclusive Licensee Nanjing Agricultural University. Distributed under a Creative Commons Attribution License (CC BY 4.0).
spellingShingle Research Article
Li, Wenjuan
Comar, Alexis
Weiss, Marie
Jay, Sylvain
Colombeau, Gallian
Lopez-Lozano, Raul
Madec, Simon
Baret, Frédéric
A Double Swath Configuration for Improving Throughput and Accuracy of Trait Estimate from UAV Images
title A Double Swath Configuration for Improving Throughput and Accuracy of Trait Estimate from UAV Images
title_full A Double Swath Configuration for Improving Throughput and Accuracy of Trait Estimate from UAV Images
title_fullStr A Double Swath Configuration for Improving Throughput and Accuracy of Trait Estimate from UAV Images
title_full_unstemmed A Double Swath Configuration for Improving Throughput and Accuracy of Trait Estimate from UAV Images
title_short A Double Swath Configuration for Improving Throughput and Accuracy of Trait Estimate from UAV Images
title_sort double swath configuration for improving throughput and accuracy of trait estimate from uav images
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8672205/
https://www.ncbi.nlm.nih.gov/pubmed/34957414
http://dx.doi.org/10.34133/2021/9892647
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