Multitemporal classification of TerraSAR-X data for wetland vegetation mapping

Julie Betbeder; Sébastien Rapinel; Thomas Corpetti; Eric Pottier; Samuel Corgne; Laurence Hubert-Moy

doi:10.1117/1.JRS.8.083648

10 April 2014 Multitemporal classification of TerraSAR-X data for wetland vegetation mapping

Julie Betbeder, Sébastien Rapinel, Thomas Corpetti, Eric Pottier, Samuel Corgne, Laurence Hubert-Moy

Author Affiliations +

Journal of Applied Remote Sensing, Vol. 8, Issue 1, 083648 (April 2014). https://doi.org/10.1117/1.JRS.8.083648

Abstract

This paper is concerned with wetland vegetation mapping using multitemporal synthetic aperture radar imagery. Although wetlands play a key role in controlling flooding and nonpoint source pollution, sequestering carbon and providing an abundance of ecological services, knowledge of the flora and fauna of these environments is patchy, and understanding of their ecological functioning is still insufficient for a reliable functional assessment on areas larger than a few hectares. The aim of this paper is to evaluate multitemporal TerraSAR-X imagery to precisely map the distribution of vegetation formations considering flood duration. A series of six dual-polarization TerraSAR-X images (HH-VV) was acquired in 2012 during dry and wet seasons. One polarimetric parameter, the Shannon entropy (SE), and two intensity parameters (σ° HH and σ° VV), which vary with wetland flooding status and vegetation roughness, were first extracted. These parameters were then classified using support vector machine techniques based on a specific kernel adapted to the comparison of time-series data, K-nearest neighbors, and decision tree (DT) algorithms. The results show that the vegetation formations can be identified very accurately (kappa index=0.85) from the classification of SE temporal profiles derived from the TerraSAR-X images. They also reveal the importance of the use of polarimetric parameters instead of backscattering coefficients alone (HH or VV) or combined (HH and VV).

Citation Download Citation

Julie Betbeder, Sébastien Rapinel, Thomas Corpetti, Eric Pottier, Samuel Corgne, and Laurence Hubert-Moy "Multitemporal classification of TerraSAR-X data for wetland vegetation mapping," Journal of Applied Remote Sensing 8(1), 083648 (10 April 2014). https://doi.org/10.1117/1.JRS.8.083648

Published: 10 April 2014

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