Technology Application |
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THE EXTRACTION OF WATERBODY INFORMATION BASED
ON THE SPECTRAL ANGLE |
JIANG Teng-Long, ZHAO Shu-He, XIAO Peng-Feng, CHEN Shu-Xin |
Department of Geographic Information Science| Nanjing University| Nanjing 210093| China |
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Abstract The waterbody information extraction method based on the spectral angle is proposed in this paper.
Nanjing was chosen as the study area and the Landsat ETM+ image (band 1~5, 7) was regarded as the test data. The
acquisition date of the image was July 17,2001 and the size of the image was 2048 columns by 2048 rows pixels. The
spectral characteristics of different ground objects in different bands were analyzed and four spectral angles (band
2~5) were calculated. Then the vegetation was separated using the differences of spectral angles in band 4. The
result of the separation of water information from shade was also quite well. Finally, the residential area was
separated easily using the differences of reflectance in band 4 and band 5.
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Keywords
Synthetic aperture radar (SAR)
Image integration
Uranium resource
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Issue Date: 12 June 2009
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