三维gis场景可视化与矢量地图符号的显示

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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-