《数字高程模型（DEM）的建立方法与精度评定》毕业学术论文.doc

西南林学院本科毕业（设计）论文 题目：数字高程模型（DEM）的建立方法与精度评定 教学院系资源学院专业地理信息系统 评阅人 数字高程模型（DEM）的建立方法与精度评定 摘 要 数字高程模型（ Digital Elevation Model，DEM）是对地球表面地形地貌的一种离散的数字表达，是地理信息系统、遥感、虚拟现实、数字化战场等领域赖以进行三维空间数据处理与地形分析的核心数据，是国家地理信息的基础数据之一。因此，如何有效的建立 DEM以及如何评价 DEM精度，成为 DEM研究的热点之一，DEM的建立和精度评定具有十分重要的理论意义和应用价值。 本文系统阐述了基于等高线数据建立高质量 DEM的理论和方法，分析并比较了国内外建立 DEM的方法。采用 ArcGIS9.2软件实现了等高线数据构建不规则三角网（ TIN）。同时，基于 VB6.0编程实现了 TIN的建立。在 DEM的研究中，DEM精度关系到 DEM的生产者与使用者，人们总是希望 DEM能够完全准确、客观地反映地球表面的起伏变化。论文也探讨了 DEM精度评定的方法，运用等高线回放方法和检查点法结合实例进行了分析，昀后总结全文并提出展望。 关键词：数字高程模型（ DEM）不规则三角网（ TIN）格网 DEM 精度等高线 Methods of Building DEM and Accuracy Assessment Abstract Digital Elevation Model is a kind of discrete digital expression to the terrain relief of the earth surface. As the most important spatial information in geographical database, DEM plays a more and more important role in many areas，such as GIS, RS, VR, digital battlefield and so on. Therefore, how to produce high quality DEM and how to evaluate the accuracy of DEM become hotspots in the research of DEM, They are very important in theoritics and valuable in use. The paper have discussed the theories and methods on how to produce high quality DEM data based on terrain feature from digital contour lines. Then we compared some popular methods of building DEM at home and abroad and tried to build the Triangulated Irregular Network model from contour lines using the software of ArcGIS9.2.we also built TIN using the Visual Basic6.0. In the research of DEM, its accuracy influences the producers and users, hence people always hope DEM can reflect the fluctuantion of the earth surface exactly and objectively. Meanwhile, the paper assessed the precision of the DEM data by contour lines overlay and observe points. At last, the paper summarized research productions and development direction. Keywords：DEM (Digital Elevation Model); (Triangulated Irregular Network) TIN; Grid DEM; accuracy ;contour line 目录 1 绪论.......................................................................