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http://dx.doi.org/10.7780/kjrs.2012.28.4.4

Assessment of Topographic Normalization in Jeju Island with Landsat 7 ETM+ and ASTER GDEM Data  

Hyun, Chang-Uk (Department of Earth and Atmospheric Sciences, University of Alberta)
Park, Hyeong-Dong (Department of Energy Resources Engineering, Seoul National University)
Publication Information
Korean Journal of Remote Sensing / v.28, no.4, 2012 , pp. 393-407 More about this Journal
Abstract
This study focuses on the correction of topographic effects caused by a combination of solar elevation and azimuth, and topographic relief in single optical remote sensing imagery, and by a combination of changes in position of the sun and topographic relief in comparative analysis of multi-temporal imageries. For the Jeju Island, Republic of Korea, where Mt. Halla and various cinder cones are located, a Landsat 7 ETM+ imagery and ASTER GDEM data were used to normalize the topographic effects on the imagery, using two topographic normalization methods: cosine correction assuming a Lambertian condition and assuming a non-Lambertian c-correction, with kernel sizes of $3{\times}3$, $5{\times}5$, $7{\times}7$, and $9{\times}9$ pixels. The effects of each correction method and kernel size were then evaluated. The c-correction with a kernel size of $7{\times}7$ produced the best result in the case of a land area with various land-cover types. For a land-cover type of forest extracted from an unsupervised classification result using the ISODATA method, the c-correction with a kernel size of $9{\times}9$ produced the best result, and this topographic normalization for a single land cover type yielded better compensation for topographic effects than in the case of an area with various land-cover types. In applying the relative radiometric normalization to topographically normalized three multi-temporal imageries, more invariant spectral reflectance was obtained for infrared bands and the spectral reflectance patterns were preserved in visible bands, compared with un-normalized imageries. The results show that c-correction considering the remaining reflectance energy from adjacent topography or imperfect atmospheric correction yielded superior normalization results than cosine correction. The normalization results were also improved by increasing the kernel size to compensate for vertical and horizontal errors, and for displacement between satellite imagery and ASTER GDEM.
Keywords
Topographic normalization; Landsat 7 ETM+; ASTER GDEM; Cosine correction; C-correction; Relative radiometric normalization;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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