Geographic Element Modeler for 3D Geographic Information System

摘要

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional geographic information system. In particular, a geographic element modeler and modeling method for a three-dimensional geographic information system for generating a geometric object corresponding to each node of a virtual reality modeling language (VRML) from a virtual GIS file format. It is about.;The present invention is a building-box geometry, building-cone geometry, building-cylindrical geometry, building-injection geometry, river-bound geometry, road geometry, pipes defined in the Virtual GIS File Format (VGFF). Read each field data of geometry and topographical geometry to create box nodes, cone nodes, cylinder nodes, injection nodes, indexed facet nodes, injection nodes, and altitude grid nodes in VRML (Virtual Reality Modeling Language). For three-dimensional geographic information systems including building-box modelers, building-cone modelers, building-cylinder modelers, building-injection modelers, river-boundary modelers, road modelers, pipe modelers, and topographical altitude modelers. Provide a geographic element modeler.