The terrain elevation points in the objective world are not continuous,but in a certain range it has the law,so an analysis of the terrain block based on the idea is proposed.The city area according to the terrain as boundary conditions is divided in-to block type of several typical,respectively is the road,water,buildings.In view of the different type,construction techniques are used to study the DEM.This paper creates elevation encryption model on the road elevation point encryption.By contrasting experi-ment,results show that our network requires that the model generates encryption elevation point meet,and it is helpful to the city of DEM to improve the accuracy,and the model is also suitable for water,for buildings.A set of convenient construction of DEM meth-od is put forward in this paper.To establish a good city DEM and further analysis of hydrological to solve the flooding problem in the city,some suggestions and methods are provided.%客观世界中地形地貌的高程点并不是连续的,但是在一定范围内,却是具有规律的,提出一种基于地形线划块分析的思路,将城市区域按照地形线作为边界条件划分典型的区块类型,以水系为例研究其DEM的构建方法,创建了高程加密模型,对道路高程点进行加密,通过实验结果表明该模型生成的加密高程点满足我们的构网要求,对城市DEM精度的提升有很大的帮助,同时该模型还适用于水系,提出了一套方便快捷构建DEM的方法.对建立好的城市DEM,进行进一步的水文分析,对城市中的内涝积水问题的解决,提供了一些建议和方法[1].
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