Change Detection and Image Time Series Analysis 2. Группа авторов

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Название Change Detection and Image Time Series Analysis 2
Автор произведения Группа авторов
Жанр Программы
Серия
Издательство Программы
Год выпуска 0
isbn 9781119882282



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Matrices pdf Probability Density Function

      1

      Hierarchical Markov Random Fields for High Resolution Land Cover Classification of Multisensor and Multiresolution Image Time Series

       Ihsen HEDHLI1, Gabriele MOSER2, Sebastiano B. SERPICO2 and Josiane ZERUBIA3

       1Institute Intelligence and Data, Université Laval, Quebec City, Canada

       2University of Genoa, Italy

       3INRIA, Université Cote d’Azur, Nice, France

      1.1.1. The role of multisensor data in time series classification

      In this chapter, this joint fusion problem is addressed. First, an overview of the major concepts and of the recent literature in the area of remote sensing data fusion is presented (see section 1.1.3). Then, two advanced methods for the joint supervised classification of multimission image time series, including multisensor optical and Synthetic Aperture Radar (SAR) components acquired at multiple spatial resolutions, are described (see section 1.2). The two techniques address different problems of supervised classification of satellite image time series and share a common methodological formulation based on hierarchical Markov random field (MRF) models. Examples of the experimental results obtained by the proposed approaches in the application to very-high-resolution time series are also presented and discussed (see section 1.3).

      On the one hand, the use of multiresolution and multiband imagery has been previously shown to optimize the classification results in terms of accuracy and computation time. On the other hand, the integration of the temporal dimension into a classification scheme can both enhance the results in terms of reliability and capture the evolution in time of the monitored area. However, the joint problem of the fusion of several distinct data modalities (e.g. multitemporal, multiresolution and multisensor) has been much more scarcely addressed in the remote sensing literature so far.

      1.1.2. Multisensor and multiresolution classification

      Figure 1.1. Sensitivity to cloud cover and object size using different wavelength ranges. For a color version of this figure, see www.iste.co.uk/atto/change2.zip

      As illustrated in Figure 1.1, SAR and multispectral images exhibit complementary properties in terms of wavelength range (active microwave vs. passive visible and infrared), noisy behavior (often strong in SAR due to speckle, usually less critical in optical imagery), feasibility of photo-interpretation (usually easier with optical than with SAR data), impact of atmospheric conditions and cloud cover (strong for optical acquisitions and almost negligible for SAR) and sensitivity to sun-illumination (strong for optical imagery and negligible for SAR) (Landgrebe 2003; Ulaby and Long 2015). This makes the joint use of high-resolution optical and SAR imagery particularly interesting for many applications related to environmental monitoring and risk management (Serpico et al. 2012).

      Figure 1.2. Multivariate statistical modeling for optical–SAR data fusion. For a color version of this figure, see www.iste.co.uk/atto/change2.zip