Abstract: In the 3D geographic information systems(GIS),it is necessary to overlay 2D vector data on a 3D multi-resolution terrain model.This paper presents a precise and efficient texture-based overlaying algorithm.It generates vector textures from cascaded view-depended cameras to improve the utilization of texture pixels.The strategies of both depth splitting and screen space dividing are further adopted.All steps are based on programmable GPU pipeline.It runs in real-time and is suitable for displaying large-scale terrain with LOD algorithms.