融合重力模拟机制和地表几何形态的DEM地形分析矢量方法研究

项目名称： 融合重力模拟机制和地表几何形态的DEM地形分析矢量方法研究

项目编号： No.41301507

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 天文学、地球科学

项目作者： 晋蓓

作者单位： 西北农林科技大学

项目金额： 25万元

中文摘要： 针对DEM地形分析方法的结构依赖性、尺度依赖性、算法依赖性和高程敏感性等问题，本研究拟建立定性与定量描述相结合的指标体系，深入剖析地形分析解译算法的误差及其传播机理，在兼顾局部保真、全局高效的原则下，解决格网DEM和等高线的有机耦合问题，研究融合地形参数的重力模拟机制和地形表面的几何形态特征的新型DEM解译算法，讨论该方法的基本要素及其与结果间的响应机制，构建DEM地形分析矢量方法的理论体系。该方法通用于常用的DEM数据结构，能够准确计算出大部分的地形参数，能更准确地表达了适于以矢量结构描述的地形参数，在保留格网DEM的重力模拟机制的同时，较好地运用了等高线对地形几何形态的描述，具有一定的弱尺度依赖性和低误差敏感性。该方法将数字地形分析的算法设计由地形参数的重力模拟推向地形参数的重力模拟与地形曲面的几何形态结合的层面，是数字地形分析研究的有益探索，提升DEM地形分析方法的通用性和准确性。

中文关键词： 数字地形分析；数字高程模型；等高线；坡度；坡向

英文摘要： In view of the existing problems in Digital Terrain Analysis (DTA)which contains the dependence of data structure, scale and interpretation algorithms and the sensitivity of elevation error, this research intends to establish evaluation index system which combines qualitative and quantitative description to do in-depth analysis of errors and its propagation mechanism of interpretation algorithm of DTA. Furthermore, the study integrates grid DEM and contour with consideration of both local fidelity and global efficient to focus on a list of novel interpretation algorithms that integrated of gravity simulation mechanism and terrain geometric form, and to discuss the basic elements and the response mechanism to its results. Finally, the theoretical system of vector method of DTA will be constructed.Not only can this method be applied to grid DEM, it can also be applied to TIN and contour, which are three of the most common data structures. The method is able to accurately calculate and express terrain parameters that are suitable for vector structure. And it also retains the mechanism of gravity simulation and utilize the contour in description of terrain surface. So it is a promising method because of its weak dependence of DEM scale and low sensitivity of elevation error. This method will push the design of inte

英文关键词： Digital Terrain Analysis；Digital Elevation Model；Contour；slope；aspect