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青藏高原冰川湖泊补给关系自动提取方法

已有 427 次阅读 2017-9-12 12:59 |个人分类:科研进展|系统分类:论文交流

这个工作是我指导硕士生,和我青藏所工作的师姐合作,利用数字地形分析中流向提取算法结合有向无环图搜索算法,设计实现了一套提取青藏高原冰川湖泊补给关系的自动化方法,刚在线发表在International Journal of Digital Earth上。青藏所的合作者还在对方法应用结果进行后续分析、检查,希望后续发布数据产品。这个方法也适合于提取类似的其他多种补给关系。


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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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