1. A method of modifying 2.5D GIS data for a 2D GIS system, the method comprising: displaying 3D graphic indicia on a display device, the graphic indicia being displayed in a geospatial manner as a function of 2.5D GIS data in a GIS database associated with a 2D GIS system; and modifying the 2.5D GIS data in the GIS database using the 3D graphic indicia displayed on the display device, including mapping user selections relating to the 3D graphic indicia to 2D geo-location coordinates and modifying the 2.5D GIS data based on the 2D geo-location coordinates.