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http://dx.doi.org/10.7848/ksgpc.2012.30.2.163

Shadow Extraction of Urban Area using Building Edge Buffer in Quickbird Image  

Yeom, Jun-Ho (서울대학교 건설환경공학부)
Chang, An-Jin (서울대학교 건설환경공학부)
Kim, Yong-Il (서울대학교 건설환경공학부)
Publication Information
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography / v.30, no.2, 2012 , pp. 163-171 More about this Journal
Abstract
High resolution satellite images have been used for building and road system analysis, landscape analysis, and ecological assessment for several years. However, in high resolution satellite images, shadows are necessarily cast by manmade objects such as buildings and over-pass bridges. This paper develops the shadow extraction procedures in urban area including various land-use classes, and the extracted shadow areas are evaluated by a manually digitized shadow map. For the shadow extraction, the Canny edge operator and the dilation filter are applied to make building edge buffer area. Also, the object-based segmentation was performed using Gram-Schmitt fusion image, and spectral and spatial parameters are calculated from the segmentation results. Finally, we proposed appropriate parameters and extraction rules for the shadow extraction. The accuracy of the shadow extraction results from the various assessment indices is 80% to 90%.
Keywords
Shadow extraction; Building edge buffer; Quickbird; High resolution satellite image;
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Times Cited By KSCI : 1  (Citation Analysis)
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