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| Shanmugam,P.; Ahn,Yu-Hwan; Hyung Ryu,Joo. |
| The objective of the present study is to compare certain conventional satellite image processing techniques with the recently evolved linear spectral unmixing method and to ascertain the best possible technique that can identify and position of aquaculture farms accurately in and around the Younggwang coastal region of Korea. Various conventional techniques existed to extract such information are spectral enhancement and classification. However, these techniques performed on the Landsat-TM imagery do not seem to yield accurate information about the aquaculture farms, and instead lead to misinterpretation and misclassification. A large discrepancy between the actual and extracted information results from spectral confusion and inadequate spatial resolution... |
| Tipo: Journal article |
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| Ano: 2004 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300038 |
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| Hwan Ahn,Yu; Shanmugam,P; Hyung Ryu,Joo. |
| This paper describes methods for the correction of the atmospheric effects in the Landsat VIS/NIR imagery in relation to the retrieval of meaningful information about the ocean color, especially from Case-2 waters around Korean peninsula. Three atmospheric correction (AC) methods implemented and examined, using the TOA radiance or reflectance data, are 6S radiative transfer model, spectral shape matching (SSMM) and path-extraction methods. The results show that overall shape and magnitude of radiance or reflectance spectra of the atmospherically corrected Landsat VIS/NIR imagery by SSMM appears to have very good agreement with the in-situ spectra collected for clear and turbid waters, while path-extraction over turbid waters though often reproduces in-situ... |
| Tipo: Journal article |
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| Ano: 2004 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200002 |
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| Hyung Ryu,Joo; Hwan Ahn,Yu; Shanmugam,P.. |
| Striking patterns of suspended sediments created by a complex interplay of physical, chemical, biological and geological processes in the East China Sea (ECS) and Yellow Sea (YS) have been investigated using SeaWiFS ocean color imagery. The structure of these patterns can reveal a great deal about the processes underlying their formation. Sea surface temperature (SST) analyzed from the Advanced Very High Resolution Radiometer (AVHRR) thermal infrared data and in-situ were used to elucidate the physical factors responsible for the evolution of such patterns in the inner and outer selves areas, whilst concomitant patterns of suspended sediment were tracked from the Sea-viewing Wide Field-of-view Sensor (SeaWiFS) ocean color imagery. A careful analysis of... |
| Tipo: Journal article |
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| Ano: 2004 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300036 |
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