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Water 2013, 5(3), 1036-1051; doi:10.3390/w5031036
Article

Wetland Monitoring Using the Curvelet-Based Change Detection Method on Polarimetric SAR Imagery

1,*  and 2
Received: 25 April 2013 / Revised: 3 June 2013 / Accepted: 1 July 2013 / Published: 11 July 2013
(This article belongs to the Special Issue Advances in Remote Sensing of Flooding)
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Abstract

One fundamental task in wetland monitoring is the regular mapping of (temporarily) flooded areas especially beneath vegetation. Due to the independence of weather and illumination conditions, Synthetic Aperture Radar (SAR) sensors could provide a suitable data base. Using polarimetric modes enables the identification of flooded vegetation by means of the typical double-bounce scattering. In this paper three decomposition techniques—Cloude-Pottier, Freeman-Durden, and Normalized Kennaugh elements—are compared to each other in terms of identifying the flooding extent as well as its temporal change. The image comparison along the time series is performed with the help of the Curvelet-based Change Detection Method. The results indicate that the decomposition algorithm has a strong impact on the robustness and reliability of the change detection. The Normalized Kennaugh elements turn out to be the optimal representation for Curvelet-based change detection processing. Furthermore, the co-polarized channels (same transmit and receive polarization in horizontal (HH) and vertical (VV) direction respectively) appear to be sufficient for wetland monitoring so that dual-co-polarized imaging modes could be an alternative to conventional quad-polarized acquisitions.
Keywords: change detection; Curvelets; flood monitoring; flooded vegetation; image enhancement; polarimetric decomposition; polarimetry; Synthetic Aperture Radar; wetlands change detection; Curvelets; flood monitoring; flooded vegetation; image enhancement; polarimetric decomposition; polarimetry; Synthetic Aperture Radar; wetlands
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.

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Schmitt, A.; Brisco, B. Wetland Monitoring Using the Curvelet-Based Change Detection Method on Polarimetric SAR Imagery. Water 2013, 5, 1036-1051.

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