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http://dx.doi.org/10.7780/kjrs.2009.25.4.383

Investigation of Intertidal Zone using TerraSAR-X  

Park, Jeong-Won (Department of Earth System Sciences, Yonsei University)
Lee, Yoon-Kyung (Department of Earth System Sciences, Yonsei University)
Won, Joong-Sun (Department of Earth System Sciences, Yonsei University)
Publication Information
Korean Journal of Remote Sensing / v.25, no.4, 2009 , pp. 383-389 More about this Journal
Abstract
The main objective of the research is a feasibility study on the intertidal zone using a X-band radar satellite, TerraSAR-X. The TerraSAR-X data have been acquired in the west coast of Korea where large tidal flats, Ganghwa and Yeongjong tidal flats, are developed. Investigations include: 1) waterline and backscattering characteristics of the high resolution X-band images in tidal flats; 2) polarimetric signature of halophytes (or salt marsh plants), specifically Suaeda japonica; and 3) phase and coherence of interferometric pairs. Waterlines from TerraSAR-X data satisfy the requirement of horizontal accuracy of 60 m that corresponds to 20 cm in average height difference while current other spaceborne SAR systems could not meet the requirement. HH-polarization was the best for extraction of waterline, and its geometric position is reliable due to the short wavelength and accurate orbit control of the TerraSAR-X. A halophyte or salt marsh plant, Suaeda japonica, is an indicator of local sea level change. From X-band ground radar measurements, a dual polarization of VV/VH-pol. is anticipated to be the best for detection of the plant with about 9 dB difference at 35 degree incidence angle. However, TerraSAR-X HH/TV dual polarization was turned to be more effective for salt marsh monitoring. The HH-HV value was the maximum of about 7.9 dB at 31.6 degree incidence angle, which is fairly consistent with the results of X-band ground radar measurement. The boundary of salt marsh is effectively traceable specifically by TerraSAR-X cross-polarization data. While interferometric phase is not coherent within normal tidal flat, areas of salt marsh where the landization is preceded show coherent interferometric phases regardless of seasons or tide conditions. Although TerraSAR-X interferometry may not be effective to directly measure height or changes in tidal flat surface, TanDEM-X or other future X-band SAR tandem missions within one-day interval would be useful for mapping tidal flat topography.
Keywords
TerraSAR-X; synthetic aperture radar (SAR); tidal flat; waterline DEM; Hylophytes monitoring; radar interferometry (InSAR);
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Times Cited By KSCI : 2  (Citation Analysis)
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1 우한준, 제종길, 2002. 강화 남부 갯벌의 퇴적환경 변화, Ocean and Polar Research, 24(4): 331- 343   DOI
2 Valenzuela, G. R., 1978. Theories for the interaction of electromagnetic and oceanic waves - A review, Boundary-Layer Meteorology, 13(1): 61- 85   DOI
3 Kim, D.-J., W. Moon, S.-E. Park, J.-E. Kim, and H.-S. Lee, 2007. Dependence of wterline mpping on radar frequency used for SAR images in intertidal areas, IEEE Geoscience and Remote Sensing Letters, 4(2): 269-273   DOI   ScienceOn
4 Hong, S.-H., H.-S. Jung, and J.-S. Won, 2006. Extraction of ground control points (GCPs) from synthetic aperture radar images and SRTM DEM, International Journal of Remote Sensing, 27(18): 3813-3829   DOI   ScienceOn
5 국립공원관리공단, 1998. 태안해안국립공원의 해안습지 및 비교대상지 조사
6 한국해양연구원, 1998. 갯벌의 효율적인 이용과 보존을 위한 연구
7 Ryu, J. H., C.-H. Kim, Y.-K. Lee, J.-S. Won, S.-S. Chun, and S. Lee, 2008. Detecting the intertidal morphologic change using satellite data, Estuarine, Coastal and Shelf Science, 78: 623-632   DOI   ScienceOn
8 Hagg, W. and M. Sties, 1994. Efficient speckle filtering of SAR images, Proc. of 1994 IEEE International Geoscience and Remote Sensing Symposium, Pasadena, CA, USA, Aug. 8-12, 1994, 4: 2140-2142
9 박정원, 홍상훈, 원중선, 2008. TerraSAR-X를 이용한 지상기준점 추출, 대한원격탐사학회지, 24(4): 299-307   과학기술학회마을   DOI