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Article

Mapping Cynodon Dactylon Infesting Cover Crops with an Automatic Decision Tree-OBIA Procedure and UAV Imagery for Precision Viticulture

1
Department of Crop Protection, Institute for Sustainable Agriculture (IAS), Spanish National Research Council (CSIC), 14004 Córdoba, Spain
2
Plant Protection Department, Institute of Agricultural Sciences (ICA), Spanish National Research Council (CSIC), 28006 Madrid, Spain
3
Grupo de Malherbología y Ecología vegetal, Dpto HBJ. ETSEA. Agrotecnio, Universitat de Lleida, 25198 Lleida, Spain
*
Author to whom correspondence should be addressed.
Remote Sens. 2020, 12(1), 56; https://doi.org/10.3390/rs12010056
Received: 1 November 2019 / Revised: 13 December 2019 / Accepted: 18 December 2019 / Published: 21 December 2019
(This article belongs to the Special Issue Remote Sensing in Viticulture)
The establishment and management of cover crops are common practices widely used in irrigated viticulture around the world, as they bring great benefits not only to protect and improve the soil, but also to control vine vigor and improve the yield quality, among others. However, these benefits are often reduced when cover crops are infested by Cynodon dactylon (bermudagrass), which impacts crop production due to its competition for water and nutrients and causes important economic losses for the winegrowers. Therefore, the discrimination of Cynodon dactylon in cover crops would enable site-specific control to be applied and thus drastically mitigate damage to the vineyard. In this context, this research proposes a novel, automatic and robust image analysis algorithm for the quick and accurate mapping of Cynodon dactylon growing in vineyard cover crops. The algorithm was developed using aerial images taken with an Unmanned Aerial Vehicle (UAV) and combined decision tree (DT) and object-based image analysis (OBIA) approaches. The relevance of this work consisted in dealing with the constraint caused by the spectral similarity of these complex scenarios formed by vines, cover crops, Cynodon dactylon, and bare soil. The incorporation of height information from the Digital Surface Model and several features selected by machine learning tools in the DT-OBIA algorithm solved this spectral similarity limitation and allowed the precise design of Cynodon dactylon maps. Another contribution of this work is the short time needed to apply the full process from UAV flights to image analysis, which can enable useful maps to be created on demand (within two days of the farmer´s request) and is thus timely for controlling Cynodon dactylon in the herbicide application window. Therefore, this combination of UAV imagery and a DT-OBIA algorithm would allow winegrowers to apply site-specific control of Cynodon dactylon and maintain cover crop-based management systems and their consequent benefits in the vineyards, and also comply with the European legal framework for the sustainable use of agricultural inputs and implementation of integrated crop management. View Full-Text
Keywords: site-specific weed management; object-based image analysis (OBIA); bermudagrass; vineyard; vegetation mapping; unmanned aerial vehicle; machine learning site-specific weed management; object-based image analysis (OBIA); bermudagrass; vineyard; vegetation mapping; unmanned aerial vehicle; machine learning
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MDPI and ACS Style

de Castro, A.I.; Peña, J.M.; Torres-Sánchez, J.; Jiménez-Brenes, F.M.; Valencia-Gredilla, F.; Recasens, J.; López-Granados, F. Mapping Cynodon Dactylon Infesting Cover Crops with an Automatic Decision Tree-OBIA Procedure and UAV Imagery for Precision Viticulture. Remote Sens. 2020, 12, 56. https://doi.org/10.3390/rs12010056

AMA Style

de Castro AI, Peña JM, Torres-Sánchez J, Jiménez-Brenes FM, Valencia-Gredilla F, Recasens J, López-Granados F. Mapping Cynodon Dactylon Infesting Cover Crops with an Automatic Decision Tree-OBIA Procedure and UAV Imagery for Precision Viticulture. Remote Sensing. 2020; 12(1):56. https://doi.org/10.3390/rs12010056

Chicago/Turabian Style

de Castro, Ana I., José M. Peña, Jorge Torres-Sánchez, Francisco M. Jiménez-Brenes, Francisco Valencia-Gredilla, Jordi Recasens, and Francisca López-Granados. 2020. "Mapping Cynodon Dactylon Infesting Cover Crops with an Automatic Decision Tree-OBIA Procedure and UAV Imagery for Precision Viticulture" Remote Sensing 12, no. 1: 56. https://doi.org/10.3390/rs12010056

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