电子科技大学UNIVERSITYOFELECTRONICSCIENCEANDTECHNOLOGYOFCHINA学士学位论文BACHELORDISSERTATION论文题目:论文题目:论文题目:论文题目:基于DEM规则格网绘制等高线学生姓名:学生姓名:学生姓名:学生姓名:秦自松学学学学号:号:号:号:2607102009专专专专业:业:业:业:测控技术与仪器学学学学院:院:院:院:自动化工程学院指导教师:指导教师:指导教师:指导教师:蒋玲指导单位:指导单位:指导单位:指导单位:自动化工程学院2010201020102010年年年年06060606月月月月08080808日日日日摘要I摘要随着地理信息系统(GIS)的不断发展,DEM(DigitalElevationModel,即数字高程模型)在GIS中得到了越来越广泛的应用,成为GIS中的一个重要组成部分。目前,DEM数据的获得不再仅仅局限于原先保存的纸质地形图的数字化,也许是利用激光测距仪配合地面控制点获得,由这种方法获得的DEM格网数据可能需要生成等高线图,以此作为基础地理数据或底图。本论文研究DEM数据模型、数据结构以及由DEM数据生产等高线的方法,主要从计算机地图制图的角度,研究基于DEM规则格网的等高线自动绘制问题。同时,利用VC++设计编写程序,通过实验证明其正确性和有效性。关键词:DEM;等高线;规则格网;数字高程模型。ABSTRACTIIABSTRACTAlongwiththeadvanceofGeographicInformationSystem(GIS),DigitalElevationModel(DEM)aregettingmoreandmorewidelyappliedinGIS,andbecomeanimportantcomponent.Atpresent,theobtainedDEMdatanolongerconfinedtopreservetheoriginalpaper,digitalmapmaybeusinglaserrangefindercoupledwithgroundcontrolandthegridDEMdatamayneedtogeneratecontourmap,asabasicgeographicdataorforreproduction.ThispaperstudiestheDEMdatamodel,datastructureandthemethodofproducingcontourDEMdata,mainlyfromtheAngleofcomputermapping,researchthecontouroftheautomaticdrawingbasedongridDEMdata.Atthesametime,usingVC++designprogram,throughtheexperimentprovesitscorrectnessandeffectiveness.Keywords:Keywords:Keywords:Keywords:DEM,Contours,GridDEM,Digitalelevationmodel(DEM).目录第1章引言...................................................................................................................11.1本论文的背景.....................................................................................................11.2本论文的价值及其意义.....................................................................................11.3本论文的国内外研究现状.................................................................................2第2章相关知识概述...................................................................................................32.1DEM的定义..........................................................................................................32.2CNSDTF-DEM数据格式简介................................................................................42.3等高线的定义及其特点.....................................................................................62.4等高线跟踪相关算法.........................................................................................6第3章基于DEM规则格网绘制等高线方法研究.....................................................103.1格网数据的高斯滤波处理...............................................................................103.2等高线的扫描与绘制.......................................................................................113.2.1基于DEM提取等高线概述.......................................................................113.2.2内插高程点方法.......................................................................................123.2.3格网的遍历方法.....