An object-oriented system for building and maintaining a spatial data structure for use in topological applications. The data is organized in a database which incorporates spatial feature location, attributes, and metadata information in a relational framework across a hierarchy. The system provides...http://www.google.com/patents/US6950828?utm_source=gb-gplus-sharePatent US6950828 - Method and apparatus for building and maintaining an object-oriented geospatial database
