本科学生毕业论文
DEM模型的数据结构及生成
    黑 龙 江 工 程 学 院
    二○一二年六月
The Graduation Thesis for Bachelor's Degree
DEM Model Data Structure and Generate
         
Heilongjiang Institute of Technology
2012-06·Harbin

摘    要
数字高程模型(Digilal Elevation 数据结构与算法论文Model)简称DEM,作为三维地理信息系统的基础数据，越来越广泛应用于各种地理分析当中。DEM是一个具有光谱特征的连续的栅格图像数据,在坡度、坡向分析、高程分带、地形阴影、彩地势、地形校正处理等地形分析中,都是以DEM为基础进行的。
DEM的建立是模型应用的基础，可采用直接建立方法和间接建立方法。探讨DEM的转换方法，有助于解决三维GIS中不同地形数据格式的转换问题，促进三维GIS空间模型的研究发展，进一步增强三维GIS软件的可用性。
论文在数字高程模型的基础上,着重讨论了规则格网模型的数据结构和应用以及利用离散点模型转换生成DEM的方法，主要研究离散点模型向规则格网(GRID)转换的基本思路,讨论了在建模过程中所遇到问题的解决方法，最后通过调用不规则采样点的数据,利用VB语言编程实现规则格网的生成
关键词：数字高程模型；离散点；规则格网；数据结构
ABSTRACT
Digital elevation model (Digital Elevation Model) referred to DEM, 3D Geographic Information System as the basis of data, more and more widely used among a variety of geographic analysis. DEM is a continuous spectrum of characteristics of image data grid, in the slope, slope analysis, elevation banding, terrain shadow, color terrain, terrain correction, such as terrain analysis, are based on the DEM.
DEM created is the base of the model application, which can adopt the direct and indirect establishing methods. Study on DEM transformation method is helpful to solve the three-dimensional GIS data formats of different landforms in the transformation problem, promote the development of study on three-dimensional GIS spatial model and further enhance the availability of three-dimensional GIS software.
Thesis on the basis of the model, focused on the DEM structure of the data model and application of the GRID generation contour map algorithm, include described using the discrete points generated DEM model transformation method, major studyed the discrete points conversion to the regular grid (GRID) .Finally, by calling the irregular data sampling points, using VB programming language generation Grid
Key words: Digital Elevation Model；Discrete Points； Regular Grid；Data Structure

               
附录B    38