1. A method of integrating a 3D visualization system with a 2D GIS system to provide an interactive 3D interface, the method comprising: providing an interface between the 2D GIS system and the 3D visualization system; providing, by the interface, GIS information received from the 2D GIS system to the 3D visualization system; providing, by the interface, 3D rendering data from the 3D visualization system to the 2D GIS system; producing, by the 2D GIS system, a display in a 3D window on a display device including 3D graphic indicia from the 3D rendering data and GIS information from the 2D GIS system, the 3D graphic indicia being displayed in a geospatial manner as a function of the GIS information; and mapping, by the interface, user sections made in the 3D window to corresponding 2D geo-location coordinates for use by the 2D GIS system.