Wartell, ZacharyKang, EunjungWasilewski, TonyRibarsky, WilliamFaust, NickolasG.-P. Bonneau and S. Hahmann and C. D. Hansen2014-01-302014-01-3020033-905673-01-01727-5296https://doi.org/10.2312/VisSym/VisSym03/213-222Modern desktop PCs are capable of taking 2D Geographic Information System (GIS) applications into the realm of interactive 3D virtual worlds. In prior work we developed and presented graphics algorithms and data management methods for interactive viewing of a 3D global terrain system for desktop and virtual reality systems. In this paper we present a key data structure and associated render-time algorithm for the combined display of multi-resolution 3D terrain and traditional GIS polyline vector data. Such vector data is traditionally used for representing geographic entities such as political borders, roads, rivers and cadastral information