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Remote Sens. 2017, 9(11), 1151; doi:10.3390/rs9111151

Fusion Approaches for Land Cover Map Production Using High Resolution Image Time Series without Reference Data of the Corresponding Period

1
CESBIO (Centre d’Etudes Spatiales de la BIOsphere), Université de Toulouse, CNES/CNRS/IRD/UPS, 18 avenue Edouard Belin, 31401 Toulouse CEDEX 9, France
2
CNES (Centre National d’Etudes Spatiales), 18 avenue Edouard Belin, 31401 Toulouse CEDEX 9, France
*
Author to whom correspondence should be addressed.
Received: 10 October 2017 / Revised: 30 October 2017 / Accepted: 7 November 2017 / Published: 9 November 2017
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Abstract

Optical sensor time series images allow one to produce land cover maps at a large scale. The supervised classification algorithms have been shown to be the best to produce maps automatically with good accuracy. The main drawback of these methods is the need for reference data, the collection of which can introduce important production delays. Therefore, the maps are often available too late for some applications. Domain adaptation methods seem to be efficient for using past data for land cover map production. According to this idea, the main goal of this study is to propose several simple past data fusion schemes to override the current land cover map production delays. A single classifier approach and three voting rules are considered to produce maps without reference data of the corresponding period. These four approaches reach an overall accuracy of around 80% with a 17-class nomenclature using Formosat-2 image time series. A study of the impact of the number of past periods used is also done. It shows that the overall accuracy increases with the number of periods used. The proposed methods require at least two or three previous years to be used. View Full-Text
Keywords: land cover; satellite image time series; random forests; domain adaptation; classification fusion land cover; satellite image time series; random forests; domain adaptation; classification fusion
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Tardy, B.; Inglada, J.; Michel, J. Fusion Approaches for Land Cover Map Production Using High Resolution Image Time Series without Reference Data of the Corresponding Period. Remote Sens. 2017, 9, 1151.

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