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Integration of speckle de-noising and image segmentation using synthetic aperture radar image for flood extent extraction

Senthilnath, J and Shenoy, Vikram H and Rajendra, Ritwik and Omkar, SN and Mani, V and Diwakar, PG (2013) Integration of speckle de-noising and image segmentation using synthetic aperture radar image for flood extent extraction. In: Journal of Earth System Science, 122 (3). pp. 559-572.

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Official URL: http://www.ias.ac.in/jess/absjun2013.htm#1

Abstract

Flood is one of the detrimental hydro-meteorological threats to mankind. This compels very efficient flood assessment models. In this paper, we propose remote sensing based flood assessment using Synthetic Aperture Radar (SAR) image because of its imperviousness to unfavourable weather conditions. However, they suffer from the speckle noise. Hence, the processing of SAR image is applied in two stages: speckle removal filters and image segmentation methods for flood mapping. The speckle noise has been reduced with the help of Lee, Frost and Gamma MAP filters. A performance comparison of these speckle removal filters is presented. From the results obtained, we deduce that the Gamma MAP is reliable. The selected Gamma MAP filtered image is segmented using Gray Level Co-occurrence Matrix (GLCM) and Mean Shift Segmentation (MSS). The GLCM is a texture analysis method that separates the image pixels into water and non-water groups based on their spectral feature whereas MSS is a gradient ascent method, here segmentation is carried out using spectral and spatial information. As test case, Kosi river flood is considered in our study. From the segmentation result of both these methods are comprehensively analysed and concluded that the MSS is efficient for flood mapping.

Item Type: Journal Article
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Additional Information: Copyright of this article belongs to Indian Academy of Sciences.
Keywords: Synthetic Aperture Radar; Flood Assessment; Speckle Filters; Gray Level Co-Occurrence Matrix; Mean Shift Segmentation
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering (Formerly, Aeronautical Engineering)
Date Deposited: 20 Aug 2013 11:49
Last Modified: 20 Aug 2013 11:49
URI: http://eprints.iisc.ernet.in/id/eprint/46981

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