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Remote Sens. 2019, 11(2), 118; https://doi.org/10.3390/rs11020118

In-Season Mapping of Irrigated Crops Using Landsat 8 and Sentinel-1 Time Series

1
Centre d’Etudes Spatiales de la Biosphère; UMR 5126, 18 avenue Edouard Belin, 31401 Toulouse Cedex 9, France
2
Airbus-Defense & Space, 31 rue des Cosmonautes, 31400 Toulouse, France
*
Author to whom correspondence should be addressed.
Received: 13 November 2018 / Revised: 21 December 2018 / Accepted: 21 December 2018 / Published: 10 January 2019
(This article belongs to the Special Issue High Resolution Image Time Series for Novel Agricultural Applications)
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Abstract

Numerous studies have reported the use of multi-spectral and multi-temporal remote sensing images to map irrigated crops. Such maps are useful for water management. The recent availability of optical and radar image time series such as the Sentinel data offers new opportunities to map land cover with high spatial and temporal resolutions. Early identification of irrigated crops is of major importance for irrigation scheduling, but the cloud coverage might significantly reduce the number of available optical images, making crop identification difficult. SAR image time series such as those provided by Sentinel-1 offer the possibility of improving early crop mapping. This paper studies the impact of the Sentinel-1 images when used jointly with optical imagery (Landsat8) and a digital elevation model of the Shuttle Radar Topography Mission (SRTM). The study site is located in a temperate zone (southwest France) with irrigated maize crops. The classifier used is the Random Forest. The combined use of the different data (radar, optical, and SRTM) improves the early classifications of the irrigated crops (k = 0.89) compared to classifications obtained using each type of data separately (k = 0.84). The use of the DEM is significant for the early stages but becomes useless once crops have reached their full development. In conclusion, compared to a “full optical” approach, the “combined” method is more robust over time as radar images permit cloudy conditions to be overcome. View Full-Text
Keywords: irrigated crops; seasonal crop mapping; satellite image time series; Sentinel-2; Landsat-8; Random Forest irrigated crops; seasonal crop mapping; satellite image time series; Sentinel-2; Landsat-8; Random Forest
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Demarez, V.; Helen, F.; Marais-Sicre, C.; Baup, F. In-Season Mapping of Irrigated Crops Using Landsat 8 and Sentinel-1 Time Series. Remote Sens. 2019, 11, 118.

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