基于ANUDEM与山脊抬升的DEM简化

为在DEM简化过程中充分保留地形骨架信息,提出一种基于ANUDEM与山脊抬升的DEM简化方法。利用ANUDEM插值法获得顾及水文要素的DEM简化表面,并对简化DEM实施山脊抬升,从而得到顾及地形骨架的简化表面。实验表明,在简化DEM中实施山脊抬升能够更大程度地增强简化表面山体结构的保留程度,且随着地形简化程度的降低,山脊抬升法的作用也逐渐增大。

DEM generalization based on ANUDEM and ridgeline uplift method

In order to maintain the skeletons of terrain surface during the process of grid‐based DEM generalization ,a new method ,which is based on ANUDEM and ridgeline uplift ,is proposed .Firstly ,the critical feature points ,the hydrologic features ,and the ridgelines are calculated .Secondly ,the interpolation method of ANUDEM is used to obtain the generalized drainage‐constrained DEM .Thirdly ,for retaining the structure of mountains during the process of generalization ,the ridgeline uplift method is used .Finally ,the generalized skeleton‐constrained grid‐based DEM is generated .The results show that the new method can improve the ridgeline matching rates to some degree ,and with the decrease of the generalized degree ,the efficiency of ridgeline uplift method increases .