数字地形模型及地形特征解析

道路和森林开发形式自动化设计其根本的一步,就是如何在选择的对象区域上制作数字地形模型。本文对建立数字地形模型的常用方法(方格网法)进行了解析和介绍。其中提出了依据不同比例尺的地形图来确定方格网密度的对应关系。这样建立的地形模型所表达的地面是诸多双曲抛物面的集合体。在此基础上利用数字地形模型对影响地形特征的几个因素:标高、倾斜、起伏量、谷密度进行定量分析,确定其具体计算方法,并找出他们同地形指数的相关性,据此选择适当的森林开发形式。

DIGITAL TERRAIN MODEL AND TERRAIN FEATURE ANALYSIS

The important step of automatization in road design and forestry development is how to make the digital terrain model according to the specific territory. Common method (source grid method) is analysed and introduced, and relation between square grid method and topographic map with different scale was presented. Then, the quantitative analysis was made to the factors such as elevation,slope, relief energy and valley density which directly affect terrain feature. The relation between factors and terrain index is found. Suitable forest development form should be chosen.