Abstract: A method, apparatus, system, and computer program product provide the ability to design a road intersection in a three-dimensional (3D) modeling and visualization system. Two roads are defined in the system with the second road intersecting the first road. A set of design rules (that define characteristics of use that contribute to a shape of the road intersection) is acquired. Based on the set of rules, a 3D model of the road intersection is directly created. A property of one of the roads is modified. Without additional user input, the 3D model of the road intersection is automatically and dynamically updated based on the modified property and while maintaining conformance with the set of design rules.

Abstract: A method, apparatus, system, and computer program product provide the ability to design a road intersection in a three-dimensional (3D) modeling and visualization system. Two roads are defined in the system with the second road intersecting the first road. A set of design rules (that define characteristics of use that contribute to a shape of the road intersection) is acquired. Based on the set of rules, a 3D model of the road intersection is directly created. A property of one of the roads is modified. Without additional user input, the 3D model of the road intersection is automatically and dynamically updated based on the modified property and while maintaining conformance with the set of design rules.

Abstract: A CAD/GIS system that automatically generates faces within land site maps, by sliding or rotating line segments between boundaries given start points and other attributes. As the attributes are entered into the system, faces are automatically generated based on those attributes, which eases creation of lots within subdivisions.

Abstract: A CAD/GIS system that dynamically updates planar topologies through incremental updating techniques. Rather than batch processing all of the changes to every geometrical feature in a given site map, the changes are made in incremental fashion and only enclosures or faces/parcels that are affected by changes are updated.

Abstract: A CAD/GIS system that automatically discovers hierarchical relationships between root faces/parcels, smaller faces/parcels, and other defined areas of land. As the definitions are entered into the system, hierarchical relationships are created by the system to ease data management functions.

Abstract: A method, apparatus, and article of manufacture provide the ability to manipulate a drawing surface in a CAD/GIS computer application. A drawing surface is displayed in a CAD/GIS application followed by the performance of a surface edit operation on the drawing surface. The surface edit operation is stored/saved as an atomic property in a list of surface edit operations. The list of surface edit operations is displayed in a graphical user interface (GUI). Each surface edit operation may be independently toggled on/off in the GUI and such toggling is reflected in the CAD/GIS application by displaying an effect of executing the surface edit operation if toggled on and displaying the drawing surface without execution of the surface edit operation if toggled off.

Abstract: A method, apparatus and article of manufacture for creating daylighted objects by drawing projection lines from an intersection of two objects. Once the intersection between a plane of one object and a face or plane of another object is determined, a polyline with at least one vertex is created comprising at least one edge of the intersection of the plane and the face. Projection lines are then drawn from each vertex of the polyline to the object such that the projection lines intersect the object.