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In this research, we present the methods to extract waters from LANDSAT MSS date and to represent the extracted information. In the extraction process, it is defficult to detect small parts of waters ...such as rivers which are narrower than a pixel width of image data. In order to solve this problem, we divide the detection process into primary extraction process and the secondary extraction process: the primary one detects large scaled parts like seas, lakes, wide rivers, and the secondary one infers narrow rivers, based on the information extracted by the former. After the waters are extracted, they are represented in a graph structure, in which nodes correspond to sources, junctions, and mouths of rivers, and branches correspond to river cources and coast lines. Each node or branch bears its geographical attributes. This paper gives detailed presentation of our methods.続きを見る
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