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Open AccessArticle

Scalable Parcel-Based Crop Identification Scheme Using Sentinel-2 Data Time-Series for the Monitoring of the Common Agricultural Policy

1
Institute for Space Applications and Remote Sensing, National Observatory of Athens, I. Metaxa and Vas. Pavlou St, Penteli, 15236 Athens, Greece
2
INTIA Tecnologías e Infraestructuras Agroalimentarias, Av. Serapio Huici, 22, 31610 Villava, Spain
*
Author to whom correspondence should be addressed.
Remote Sens. 2018, 10(6), 911; https://doi.org/10.3390/rs10060911
Received: 12 March 2018 / Revised: 6 June 2018 / Accepted: 7 June 2018 / Published: 8 June 2018
(This article belongs to the Special Issue High Resolution Image Time Series for Novel Agricultural Applications)
This work investigates a Sentinel-2 based crop identification methodology for the monitoring of the Common Agricultural Policy’s (CAP) Cross Compliance (CC) and Greening obligations. In this regard, we implemented and evaluated a parcel-based supervised classification scheme to produce accurate crop type mapping in a smallholder agricultural zone in Navarra, Spain. The scheme makes use of supervised classifiers Support Vector Machines (SVMs) and Random Forest (RF) to discriminate among the various crop types, based on a large variable space of Sentinel-2 imagery and Vegetation Index (VI) time-series. The classifiers are separately applied at three different levels of crop nomenclature hierarchy, comparing their performance with respect to accuracy and execution time. SVM provides optimal performance and proves significantly superior to RF for the lowest level of the nomenclature, resulting in 0.87 Cohen’s kappa coefficient. Experiments were carried out to assess the importance of input variables, where top contributors are the Near Infrared (NIR), vegetation red-edge, and Short-Wave Infrared (SWIR) multispectral bands, and the Normalized Difference Vegetation (NDVI) and Plant Senescence Reflectance (PSRI) indices, sensed during advanced crop phenology stages. The scheme is finally applied to a Lansat-8 OLI based equivalent variable space, offering 0.70 Cohen’s kappa coefficient for the SVM classification, highlighting the superior performance of Sentinel-2 for this type of application. This is credited to Sentinel-2’s spatial, spectral, and temporal characteristics. View Full-Text
Keywords: crop identification; support vector machines; random forest; common agricultural policy; Sentinel-2 MSI; Landsat-8 OLI; feature importance; multispectral image time-series crop identification; support vector machines; random forest; common agricultural policy; Sentinel-2 MSI; Landsat-8 OLI; feature importance; multispectral image time-series
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MDPI and ACS Style

Sitokonstantinou, V.; Papoutsis, I.; Kontoes, C.; Lafarga Arnal, A.; Armesto Andrés, A.P.; Garraza Zurbano, J.A. Scalable Parcel-Based Crop Identification Scheme Using Sentinel-2 Data Time-Series for the Monitoring of the Common Agricultural Policy. Remote Sens. 2018, 10, 911.

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