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Comparison of contrast improvement of extracted laver cultivation area using parameters derived from polarimetric SAR data
Author(s): Mitsunobu Sugimoto; Kazuo Ouchi; Yasuhiro Nakamura
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Paper Abstract

In this study, image contrast between extracted laver cultivation area and background water was extensively compared using various parameters that can be calculated by dual- and quad-polarization (fully-polarimetric) synthetic aperture radar (POLSAR) data. In our test site of laver cultivation in Tokyo Bay, every year starting from October, laver cultivation nets are placed at approximately 10-20 cm below the sea surface with supporting floats with laver spores attached to the nets, grow during winter, and the grown laver is harvested in next April. Through this process, the nets are sometimes placed above the sea surface to promote photosynthesis. When the nets are placed underwater, the areas become effectively shallow water, and small-scale waves, that are the principal scatterers, are damped, resulting in reduced radar backscatter. This difference from surrounding water can appear in SAR data. Each parameter derived from Pauli decomposition, eigenvalue analysis, coherence analysis, and four-component scattering power decomposition (4-CSPD) has distinctive characteristics and react to different backscatterers differently. Contrast comparison was made using those parameters using the L-band quad-polarization data acquired by Phased-Array L-band SAR (PALSAR) on board Advanced Land Observing Satellite (ALOS) and the X-band dual-polarization data acquired by TerraSAR-X, and experimental results showed that the contrast can be improved using multi-polarization data than using single-polarization data. It has also been found that entropy performs better among dual-polarization methods, and the surface scattering component calculated from 4-CSPD exhibits higher contrast than any other parameters from quad-polarization data.

Paper Details

Date Published: 21 November 2012
PDF: 10 pages
Proc. SPIE 8525, Remote Sensing of the Marine Environment II, 85250R (21 November 2012); doi: 10.1117/12.976825
Show Author Affiliations
Mitsunobu Sugimoto, National Defense Academy (Japan)
Kazuo Ouchi, National Defense Academy (Japan)
Yasuhiro Nakamura, National Defense Academy (Japan)

Published in SPIE Proceedings Vol. 8525:
Remote Sensing of the Marine Environment II
Robert J. Frouin; Naoto Ebuchi; Delu Pan; Toshiro Saino, Editor(s)

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