Abstract: In the geographic information system (GIS), vector data has many important applications in such aspects as orientation space location and spatial analysis. It is essential to make 2D vector data overlay mapping to the 3d terrain accurately and efficiently in 3D GIS. A method based on dynamic vector texture pyramid was proposed to render vector data. The real-time generated vector texture block corresponding with the level of the pyramid according to the current view position. Vector data texture block and terrain block are one-to-one correspondence, then they are unified rendering. Unconstrained anisotropic texture filtering methods was used to reduce the texture aliasing problem. Because this method is independent of the underlying terrain geometry, so that it can combine with most multi-resolution terrain rendering methods. Experiments using multi-vector data in the digital earth system show the presented method has higher efficiency and better rendering effect.

Key words: 3D GIS, vector data, dynamic texture pyramid, unconstrained anisotropic texture