测绘工程毕业设计.doc

文档介绍：山东科技大学毕业设计(论文) 山东科技大学摘要数字高程模型(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。在 DE M 的研究中, DEM 精度关系到 DEM 的使用者与生产者,人们总是希望 DE M 能够完全准确、客观地反映地球表面的起伏变化。因此, DEM 精度成为 DEM 研究的热点之一,具有十分重要的理论意义和应用价值。 DEM 表面内插函数的选择直接影响 DEM 质量,是数字高程模型的核心问题,它贯穿于 DEM 生产、质量控制、精度评定和分析应用的各环节, 所以数字高程模型内插方法的精度研究是非常必要的。文章主要选择了两种常用的插值方法,分别在平原、丘陵、高山、湖泊和高原几种不同复杂程度的环境下对其插值的精度使用交叉验证方法进行评估。结果表明,同样的插值方法对不同复杂程度的地形效果是不一致的,两种插值方法中以克里金插值方法的插值适用性最强,精度最高。关键词:数字高程模型插值地理信息系统山东科技大学毕业设计(论文) Abstract Digital Elevation Model isa 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 area, such as GIS , RS , VR, digital battlefield and soon. In the research of DEM , its accuracy influences the users and producers , hence people always hope DEM can reflect the fluctuation of the earth surface exactly and objectively. Therefore , the accuracy of DEM es one of the DEM research hot spot , and it is very important in theoretic and valuable in use. The DEM surface interpolate function influence the DEM quality directly , is the core problem of the DEM. It pierces through to the sector of DEM produce, quality control , accuracy evaluate and apply. This paper chose two kinds of interpolating methods applied in plain, hilly, mountain, lake and plateau region, and applied cross-validation method to evaluate the interpolating accuracy . The result shows , the effectiveness of same interpolating methods are different at plex degree of terrain , the precision interpolation of Kriging interpolation method has strongest applicability and highest accuracy of the two interpolation methods . Key words : Digital Elevation Model (DEM) , interpolation, geographic information system 山东科技大学毕业设计(论文) 目录摘要..................................................................................... 1 Abstract ...................................................................