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- W2383899002 abstract "Flow-routing algorithm is the mostly common algorithm for drainage networks extraction from DEM(Digital Elevation Model),however,if there are flat surfaces in DEM,it would produce parallel flows,and it would broke the river connection because of depressions.In this paper,an improved flow-routing algorithm is proposed,it includes four steps.It scans all the data grids of the landscape and labels the peaks,the depressions and the flats at first;in the second step,it labels the basins by expanding depressions;in the third step,it traces the valley lines from the low grids on the outside border of peak regions,connects the valleys and basins to construct the raw networks;in the fourth step,it calculates the flow accumulation based on the length of valley lines and the linkage of the valleys and basins,it discards those valleys and basins with low accumulation value,after that,the algorithm can obtain the final networks.Because the method labels the flats and the basins at the beginning,so it doesn′t need to trace the flows in these regions,and avoids producing parallel flows or broken flows.It just traces the valley lines from hilltops and calculates the flow accumulation at the linked point of the drainage networks,it doesn′t need to trace and compute for all the girds,so this method can be fast." @default.
- W2383899002 created "2016-06-24" @default.
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- W2383899002 date "2010-01-01" @default.
- W2383899002 modified "2023-09-23" @default.
- W2383899002 title "A Fast Algorithm for Drainage Networks Extraction from Digital Elevation Model" @default.
- W2383899002 hasPublicationYear "2010" @default.
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