文档介绍：顾I:论文娃十DEM的地形分析与实现 Abstract In recent years,great progress hasbeen made inthedevelopment andapplication due tothedifficulties,depth and extent ofthe studyofGIS,speciai focus isgiven tothededicated study of theapplications analysis is one thispaper,the research onthissubject isexplored indetail. The paper begins with the history and present condition of research and application 3D GIS and its structure areintroduced briefl5 and the relevantbackground and theoriesarestudied,such asvectorization,data interpolation andterrainanalysis technology,etc. Itisdiscussed indetailhow toapplytechnologies such puter graphics, interpolation and visualprogramming toterrainanalysis(including elevation display, distanceand areacalculation,viewshed analysis andcharting sectionplane)in 3D acomplete setof concrete scheme torealizeterrainanalysis isdesigned based on thisscheme,data interpolation isapplied triangulation is Used forthecalculation of apolygon’s surfacearea,and viewshed analysis iscarried outusing themethod of algorithms arerealized interrainmodeling andsyntheticallyanalysis software developed withVC,OpenGL and software iScharacterized by friendly interface, and as aterrainanalysis platform,it's theoretically andexperimentally verified to meet theneeds ofpractical applications. KeyWords: GIS Digital Elevation Model terrainanalysis Triangulation visibilityanalysis 赎量论尘攘卡DEM的她蟛分析2i实现 l绪论 20世纪90年代以来,人类社会正在从工业经济边向知识经济年代。信息与信息技术作为社会经济发展的战略资源和主要生产力的观点已为人们普遍共识。信息产业已成为经济增长的新的驱动力,世界各国愈来愈把发展信息产业放在熏要的战略地位上来考虑。地理信息系统对科学的决策和科学的管理有深远的意义。在当今社会中,不论是个人还是组织每天的活动涉及的信息有70%~90%是属予地理信息的内容,作为信息最主要表现形式的地图成了人们R常生活和工作的必备工具。可以说。地图是几个世纪以来最重要的空间信息表达的载体。近年来随着高技术的发展特剐是基于计算机平台GIS的发展,地理信息系统得到只蔬广泛的应用。电子地图,载于各种媒体上的规模不等的空间数据库逐渐取代了传统地图的主导地位而成为地理信息在社会生活中表现和交流的主要形式。并逐步显永出了箕所其有的价值。地形分析是理解地表过程的关键。又与人类经济活动有密切的关系。然而长期以来大面积并且高空问分辨率的地形分析一矗存在困难。因为一方面缺乏数字化的地形资料。另一方面计算机的硬件和软件方面的限制。与此同时,随着计算杌