摘要
On the basis of the study on road elements and th e existing three-dimensional road data models, this paper puts forward the transe ct-based road modeling, resolves the modeling of the simplest road with two roa d transects, and fulfils the visualization of the road. OpenGL is applied as the tool of visualization. The map texture technology, LOD algorithm and dynamic mu lti-differentiating texture technology are of benefit to the construction of 3D road GIS, and improve the speed of roaming and effective visualization. This pa per also disusses the combination of 2D digitall road map and 3D road scene, and the dynamic response between them. Finally, on the basis of the research on the transect-based road model, this paper develops the three-dimensional road geo graphic information system called virtual road ( VRoad ), which not only suppli es road designers with a set of tool which can turn the designed 2D road data in to 3D road and the high road assistant function area in computer, but also suppl ies the road management with a set of tool which can realize the road real time and interactive roaming, high-efficiency management.
On the basis of the study on road elements and the existing three-dimensionalroad data models, this paper puts forward the transect-based road modeling, resolves the modelingof the simplest road with two road transects, and fulfils the visualization of the road. OpenGL isapplied as the tool of visualization. The map texture technology, LOD algorithm and dynamicmulti-differentiating texture technology are of benefit to the construction of 3D road GIS, andimprove the speed of roaming and effective visualization. This paper also disusses the combinationof 2D digitall road map and 3D road scene, and the dynamic response between them. Finally, on thebasis of the research on the transect-based road model, this paper develops the three-dimensionalroad geographic information system called virtual road (VRoad), which not only supplies roaddesigners with a set of tool which can turn the designed 2D road data into 3D road and the high roadassistant function area in computer, but also supplies the road management with a set of tool whichcan realize the road real time and interactive roaming, high-efficiency management.
基金
FundedbythegrantsfromHubeiprovincetechnologyprojectoftacklekeyproblem (No .2 0 0 1AA1 0 4A01)andJilinprovinceacademyofroadsurveyinganddesign
