A method, apparatus, and article of manufacture provide the ability to update a drawing surface in a CAD/GIS computer application. First, a drawing surface is displayed in a CAD/GIS application. A surface edit operation is then performed on the drawing surface. The CAD/GIS application then determines...http://www.google.de/patents/US7561990?utm_source=gb-gplus-sharePatent US7561990 - Interactive triangulated irregular network (TIN) surfaces design
