Research On Methods Of TIN Modeling In Terrain 3D Visualization

Visualization of terrain information is playing a key role in many applications such as flight simulation,3D geographic information system, etc．This paper introduces a LoD control:View-Dependent Progressive Meshes．This method uses quadric error metrics to simplify surface, defines a continuous sequence of meshes,can construct an pproximations of any complexity efficiently,supports selective refinement according to view parameters．As the application of terrain visualization advance,This paper introduce a strategy for integrating 2D data and DEM．This method "sews like a sewing-machine''the 2D data into DEM and use data model to manage 2D data and implement adding vector data on the ten'ain,querying information,layers management．...