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针对从DEM中提取河流水系时出现的平行伪河道及河道裁弯取直现象,以湖北省阳新县为例,应用AGREE算法输入数字化真实河流水系对DEM进行调整,并对比调整前后的模拟河流与矢量化的真实河流。结果表明,调整后的模拟河流与真实河流的吻合度更高,且消除了平行伪河道及裁弯取直现象。可见AGREE算法可解决从DEM中提取河流水系时的平行伪河道及河道裁弯取直问题,但需结合不同研究区的特点设定合适的参数。
Aiming at the phenomenon of parallel pseudo-river and straight-line bending of straight river when extracting river water system from DEM, taking the case of Yangxin County in Hubei Province as an example, the DEM was adjusted by AGREE algorithm and compared with that before and after adjustment Vectorized real river. The results show that the adjusted simulated river is more coincidental with the real river and the parallel pseudo-river is eliminated and the straightening of the curved river is eliminated. It can be seen that the AGREE algorithm can solve the problem of parallel pseudo-river and river bend when extracting river water system from DEM. However, it is necessary to set appropriate parameters according to the characteristics of different study areas.