Journal of Environmental Impact Assessment (환경영향평가)

Korean Society of Environmental Impact Assessment (한국환경영향평가학회)
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Calibration of NDVI Error at Shadow Areas with GRABS : Focused on Cheong City

GRABS 이용한 그림자 영역에서의 정규식생지수의 오차보정 : 청주시를 대상으로

  • Ban, Yong-Un (Dept. of Urban Engineering, Chungbuk National University) ;
  • Na, Sang-Il (Dept. of Agricultural and Rural Engineering, Chungbuk National University) ;
  • Lee, Tae-Ho (Dept. of Urban Engineering, Chungbuk National University)
  • Received : 2010.05.06
  • Accepted : 2010.06.02
  • Published : 2010.06.30
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Abstract

This study has intended to analyze the nature of the errors that occur as a result of shadows during the process of NDVI calculation using high-resolution satellite images of Cheongju City, in order to calibrate such errors, and to verify the results. This study has calibrated the shadow errors by utilizing the relationship between the Greenness above Bare Soil (GRABS) calculated through Tasseled-Cap transformation and the original NDVI. To verify the accuracy of the results, this study has compared the shadow area extracted by the difference between before and after calibration of NDVI, with the original shadow area. The NDVI value converged on the value of -1.0, representing water, because shadow areas could not accept the reflection value from each band. However, after performing Tasseled-Cap transformation, the NDVI of shadow areas that had converged on -1.0 prior to calibration had increased to a level similar to the NDVI of neighboring areas. In addition, the average NDVI in general had increased from -0.08 to -0.01. Finally, the shadow area drawn out was almost matched to the original one, meaning that the NDVI calibration method employed turned out to be highly accurate in extracting shadow areas.

Keywords

References

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