NDLI: The use of satellite imagery for monitoring coastal environment in Taiwan

Content Provider	IEEE Xplore Digital Library
Author	Chen, C.F. Chen, K.S. Chang, L.Y. Chen, A.J.
Copyright Year	1997
Description	Author affiliation: Center for Space & Remote Sensing Res., Nat. Central Univ., Chung-Li, Taiwan (Chen, C.F.)
Abstract	The authors use satellite remote sensing imagery data to monitor the near-shore environment in the coastal area. In particular, the use of ERS 1/2 SAR data to detect oil slicks near shore is described. Because the presence of oil slicks on the sea surface increases the surface tension of sea water, the surface wave motion is significantly depressed or eliminated. This effect will relatively lower the sea surface roughness, and accordingly, will decrease the radar backscattered energy. These damping effects are now well understood and it is such effects that enable the oil slicks to be discernible from the radar image. In this study, the authors are concerned with the digital techniques that effectively delineates the oil slicks pattern from SAR image. Directly using SAR images to detect the oil slicks, however, is not fully straightforward because of complex process of SAR imaging mechanism and the existing of inherent multiplicative speckle noise. The technique the authors develop is based on the fact that the oil slicks on the image gray value surface is a concave area. In order to correctly identify these concave areas and suppress the effect of speckle noise, an image pyramid with multiresolution layers is generated sequentially from the original image. Then a top-down approach, which applies both first and second order derivative operators, Difference of Gaussian (DoG) and Laplace of Gaussian (LoG), to the image pyramid, is used to detect oil patches. Two ERS-1 SAR images acquired over Taiwan water area on August 5, 1994 and September 5, 1994 were used for testing.
Starting Page	1424
Ending Page	1426
File Size	346555
Page Count	3
File Format	PDF
ISBN	0780338367
DOI	10.1109/IGARSS.1997.606466
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-08-03
Publisher Place	Singapore
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Satellites Sea measurements Petroleum Remote monitoring Sea surface Radar detection Surface waves Rough surfaces Surface roughness Radar imaging
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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