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Title
Japanese:多時期Landsatデータ解析を用いた全球水面マスクの高解像度化 
English:The Spatial Resolution Improvement of Global Water Body Map Using Multi-Temporal Landsat Data 
Author
Japanese: 池嶋大樹, 山崎大, 吉川沙耶花, 鼎信次郎.  
English: Daiki Ikeshima, Dai Yamazaki, Sayaka Yoshikawa, Shinjiro Kanae.  
Language English 
Journal/Book name
Japanese:土木学会論文集B1（水工学） 
English:Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 
Volume, Number, Page Vol. 72    No. 4    p. I421-I426
Published date 2016 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL https://www.jstage.jst.go.jp/article/jscejhe/72/4/72_I_421/_article/-char/ja/
 
DOI http://doi.org/10.2208/jscejhe.72.I_421
Abstract Separation of permanent water body and temporal water body is essential for the grasp of global water distribution. Global 3-second Water Body Map (G3WBM) is a global scale high-resolution water body map recently-developed by the authors, which separates water body types by the idea of water frequency, using multi-temporal Landsat data. In this paper, we further improved the accuracy and computational efficiency of G3WBM algorithms, and refined the resolution from 90m to 30m. The validation against U.S. National Hydrography Dataset revealed that, although some small water bodies could not be visualized, more than 85% of permanent water bodies were classified correctly. Comparison between the water body mask constructed in this paper and G3WBM in the U.S. showed that water judgment accuracy was improved and over 2600km2 of temporal water has been newly separated from permanent water.

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