A National Online Parcel-Level Map Data Portal (NPDP) is provided that optimizes online delivery of parcel-level maps and linked attribute data. To do this, the NPDP manages a database of assembled and current vector based parcel data in a spatial format (GIS) that enables geocoded parcel boundaries...http://www.google.de/patents/US7499946?utm_source=gb-gplus-sharePatent US7499946 - Computerized national online parcel-level map data portal
