三维gis场景可视化与矢量地图符号的显示

三维gis场景可视化与矢量地图符号的显示

ID:33106328

大小:9.18 MB

页数:57页

时间:2019-02-20

三维gis场景可视化与矢量地图符号的显示_第1页
三维gis场景可视化与矢量地图符号的显示_第2页
三维gis场景可视化与矢量地图符号的显示_第3页
三维gis场景可视化与矢量地图符号的显示_第4页
三维gis场景可视化与矢量地图符号的显示_第5页
资源描述:

《三维gis场景可视化与矢量地图符号的显示》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库

1、万方数据IV万方数据东北大学硕士学位论文AbstractVi姚tioninThree-dimensionalGISandVectorMapSymbolDisplayAbstractAtpresem,almostallthegeographicinformationsystem(GIS)istwo-dimensional,however,Astheneedsincreasingeveryday,three-dimensionalGISgainsmore卸ndmoreattention,three-dimensiona

2、lgeographicinformationsystemisgettingperfectbydegrees.Mapsymbolisabasictoolfortheexpressionofmapcontent,itcannotonlyshowthethingsthatthespatiallocation,shape,naRlreandamountoffeatures,butalsothattherelationshipbetweenvariousthings,andregionalgeneralcharacteris

3、tics.Mapsymbolshasbeenwidelyusedinthetwo-dimensionalmap,hasalsobeenrecognizedandacceptedbythepeople.Howtoshowtwo—dimensionalmapsymbolsinthethree-dimensionalGISisbecomingaresearchdirectionnowadays.Throe—dimensionalGISdatamodelcallbedividedintothreecategories,ph

4、ysicalmodel,surfacemodelandmixedmodel.Physicalmodeldatastructureincludessolidgeometrymodelstructure,three-dimensional西dstructure,octreestructure.SurfacemodeldatastructureincludesTIN,Grid,parametersoffunctionandboundaryrepresentation.Mixedmodeldatastructureincl

5、udesOctree·TENmixedmodeling,TIN—CSGmixedmodeling,TIN·Octreehybridmodeling.Afterwards,completethethree-dimensionaldatamodelbuilding,youhavetoachievethree-dimensionaldatavisualization,thecommonlyusedtoolisJava3D,DirectX,OpenGLandVRML.NowcommonlyusedmethodsinGISm

6、appingsymbolaredrawingportfolio,purefunctiondrawing,drawingandlineloopmethod.nlispaperselectJava3DandJava懿thedevelopmenttools,analyzeDEMfilestobuildthree-dimensionalarrays,andfurtherbuildGriddatastructure,UsingJava3Dtechnologybuildthree.dimensionalterraintoach

7、ievevisualizationofthree-dimensionalscene.Drawingpoilltsymbols:positioningtechnologytodeterminethefirstuseofsymbolsinthethree-dimensionalterrainmapcoordinates,andthendrawingmethodusingpurefunctionvectormapdisplaydotsymb01.Drawlinesymbol:byfoldmethod,theorigina

8、llineupsanddownsaccordingtoterrain,generateoffline,thendrawthelinearvectormapsymbols.Planesymboldrawn:theintersectionofthree-dimensionalterrainandpolygons,determinetherangeofthree-

当前文档最多预览五页,下载文档查看全文

此文档下载收益归作者所有

当前文档最多预览五页,下载文档查看全文
温馨提示:
1. 部分包含数学公式或PPT动画的文件,查看预览时可能会显示错乱或异常,文件下载后无此问题,请放心下载。
2. 本文档由用户上传,版权归属用户,天天文库负责整理代发布。如果您对本文档版权有争议请及时联系客服。
3. 下载前请仔细阅读文档内容,确认文档内容符合您的需求后进行下载,若出现内容与标题不符可向本站投诉处理。
4. 下载文档时可能由于网络波动等原因无法下载或下载错误,付费完成后未能成功下载的用户请联系客服处理。