초록 ▼

The present invention is a GIS system in which topological information is classified as geometrical objects and uses a region identifier and a geometry attribute to reconstruct each topological feature. The present invention starts from the geometrical objects representing topological features. Each

The present invention is a GIS system in which topological information is classified as geometrical objects and uses a region identifier and a geometry attribute to reconstruct each topological feature. The present invention starts from the geometrical objects representing topological features. Each geometrical object has an entry including a region identifier attribute and a geometry attribute defining the geometry of a complete representation of the feature. These geometrical objects are complete in that an entry of the object attribute includes a record for a geometry attribute defining the complete geometry of a complete representation of a topological feature. These complete geometrical objects need not inherit attributes from other objects. The objects are classified as either a polygon object, polyline object, point object or raster object and stored in a respective object-based database. Using this data structure, a topological region can be displayed in real time by accessing this object-based data structure and loading the data structure associated with the topological region into a buffer. The geometrical objects associated with the topological region are then fetched from the buffer and loaded into a virtual blackboard. The fetched geometrical objects are then drawn on a display in real time.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method for displaying a topology having topological features on a display, the method comprising the steps of:selecting a topological region to display;accessing at least one object-based database comprising geometrical objects representing topological features, each

[ What is claimed is:] [1.]1. A method for displaying a topology having topological features on a display, the method comprising the steps of:selecting a topological region to display;accessing at least one object-based database comprising geometrical objects representing topological features, each geometrical object comprising a region identifier attribute and a geometry attribute defining the geometry of a complete representation of a topological feature;fetching geometrical objects having a region identifier attribute associated with the selected topological region from the at least one accessed database; anddrawing representations of topological features in real time using the geometry attributes from the fetched geometrical objects on the display. [29.]29. A computer-readable medium having a data structure stored thereon for access by a GIS system to enable display of topological regions having topological features in real time, the data structure comprising:a polygon object database having polygon objects, each polygon object representing a topological feature, each polygon object comprising a region identifier attribute and a geometry attribute defining the geometry of a complete representation of a topological feature;a polyline object database having polyline objects, each polyline object associated with a topological region, each polyline object comprising a region identifier attribute and a geometry attribute defining the geometry of a complete representation of a topological feature; anda point object database having point objects, each point object associated with a topological region, each point object comprising a region identifier attribute and a geometry attribute defining the geometry of a complete representation of a topological feature.