基于多尺度DTM的坡式梯田三维可视化研究  

Multi-scale DTM Based 3D Visual Method of Slope Terraces

作　　者：周春寅[1] 赵卫东[1] 钱家忠[1] 

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009

出　　处：《地理与地理信息科学》2011年第6期41-44,49,共5页Geography and Geo-Information Science

基　　金：国家自然科学基金项目(40872166);合肥工业大学创新群体计划项目(2009HGCX0233)

摘　　要：针对黄土高原梯田可视化问题,以往的相关研究基本解决了水平梯田的三维可视化,但关于坡式梯田的研究尚为空白。坡式梯田因其具备更加突出的人工微地形特性,难以通过传统的DEM可视化方法实现其三维可视化。该文提出了多尺度DTM叠加法,利用偏移线法、高程增量法等方法提取田埂坡度特征,将研究区的低分辨率格网DEM(G-DEM)、坡式梯田分布区的高分辨率坡度DTM及G-DEM融合为一体,对坡式梯田进行三维叠加可视化。与传统G-DEM可视化方法相比,多尺度DTM叠加可视化法不仅所需数据存储量更小,而且具备更加逼真的坡式梯田三维可视化效果,能够有效显示坡式梯田的平坦田面和陡直田埂,是对基于DEM的梯田地形三维可视化的有益探索。In order to visualize terraces in Loess Plateau,some research have been made to realize the 3D visualization of level terraces.However,the research on slope terraces has still been blank.Slope terraces can hardly be visualized by traditional DEM visual method as they have the characteristics of complex artificial terrains.Therefore,a new 3D visual method called Multi-scale DTM Overlying Visual Method is put forward by the authors,and the methods such as Offset Line Method,Elevation Increment Value Method and so on are used to extract the feature of the terraces slope.The Grid-based DEM（G-DEM） with low resolution of the study area,slope-DTM and G-DEM with high resolution of slope terraces area are combined together to visualize the slope terraces.The case study shows that compared with the traditional DEM visual method,the Multi-scale DTM Overlying Visual Method needs lesser data storage and has more vivid 3D visual effect of slope terraces.This method can represent both the planar shapes of the terraces surfaces and steep ridges effectively,and it is a beneficial exploration to DEM-based 3D visualization of terraces.

关 键 词：DTM DEM 坡式梯田 可视化 多尺度DTM叠加可视化法 

分 类 号：P208[天文地球—地图制图学与地理信息工程]