LI Wei-tao, WANG Chun, LI Peng, et al. Influences of DEM Generalization Methods on Extracting Accuracy of Hydrological Structure Information[J]. Bulletin of Soiland Water Conservation, 2012, 31(4): 168-171.
LI Wei-tao, WANG Chun, LI Peng, et al. Influences of DEM Generalization Methods on Extracting Accuracy of Hydrological Structure Information[J]. Bulletin of Soiland Water Conservation, 2012, 31(4): 168-171.DOI:
50 000 DEM of Chaohu Basin was selected as base data for this study. The extracting accuracy of hydrologic characteristics was evaluated individually for five DEM generalization methods(nearest neigh bor
bilinear interpolation
cubic convolution
structured generalization
quadric surface fitting) based on three parameters including matching error of river networks
matching error of sub-watershed and gully den-sity. The results show that the extracting accuracy of hydrological structure information based on the low resolution DEM followed a descending order of the five terrain generalization methods as: quadric surface fit-ting>structured generalization>cubic convolution>bilinearinterpolation>nearest neighbor