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青藏高原冰川湖泊補給關系自動提取方法

已有 1844 次閱讀 2017-9-12 12:59 |個人分類:科研進展|系統分類:論文交流

這個工作是我指導碩士生,和我青藏所工作的師姐合作,利用數字地形分析中流向提取算法結合有向無環圖搜索算法,設計實現了一套提取青藏高原冰川湖泊補給關系的自動化方法,剛在線發表在International Journal of Digital Earth上。青藏所的合作者還在對方法應用結果進行后續分析、檢查,希望后續發布數據產品。這個方法也適合于提取類似的其他多種補給關系。


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Ai B-B, Qin C-Z*, Ye Q-H,Zhu A-X, Cogley G. An approach to extracting the surface supply relationshipsbetween glaciers and lakes on the Tibetan Plateau. International Journal of Digital Earth, 2017, 10.1080/17538947.2017.1374475.


Abstract: Surface supply relationships between glaciers and lakes are needed to analyze and understand hydrological processes at regional and global scales. However, these supply relationships still cannot be extracted efficiently by existing methods. This paper proposes an automatic and efficient approach to extracting surface supply relationships between glaciers and lakes based on meltwater flow paths. The approach includes two stages: (1) identifying direct connections between objects (i.e. glaciers and lakes) based on flow direction derived from digital terrain analysis on a gridded digital elevation model (DEM) and (2) deriving all (or user-specified) kinds of surface supply relationships based on graph search. All computation-intensive steps in this approach have been parallelized; and all steps in the proposed approach have been integrated as an automatic program. Results for the Tibetan Plateau show that given outline data for glaciers and lakes and the Shuttle Radar Topography Mission DEM, the proposed approach can automatically derive diverse surface supply relationships under user-specified restrictions on the attributes of the supply route. The parallelization in the approach effectively improves the computing efficiency. The proposed approach could also be applied to developing a detailed fundamental dataset of supply relationships between glaciers and lakes for other region or period.




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