A new digital elevation model(DEM)upscaling method based on high accuracy surface modeling(HASM)is proposed by combining the elevation information of DEM and the valley lines extracted from DEM with different flow acc...
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A new digital elevation model(DEM)upscaling method based on high accuracy surface modeling(HASM)is proposed by combining the elevation information of DEM and the valley lines extracted from DEM with different flow accumulation *** proposed method has several advantages over traditional DEM upscaling ***,the HASM ensures the smoothness of the upscaled ***,several DEMs with different topographic details can be obtained using the same DEM grid size by incorporating the valley lines with different flow accumulation *** Jiuyuangou watershed in China’s Loess Plateau was used as a case study.A DEM with a grid size of 5 m obtained from the local surveying and mapping department was used to verify the proposed DEM upscaling *** established the surface complexity index to describe the complexity of the topographic surface and quantified the differences in the topographic features obtained from different upscaling *** results show that topography becomes more generalized as grid size and flow accumulation threshold *** a large DEM grid size,an increase in the flow accumulation threshold increases the difference in elevation values in different grids,increasing the surfacecomplexity *** study provides a new DEM upscaling method suitable for quantifying topography.
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