| 摘要 |
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 to be linked to property tax records. A user enters a street address into an appropriate screen window to call up and view road right-of-ways, all parcel boundaries and the “exact” address location as a highlighted parcel area. In addition, a list of property record attributes such as owner, use code, assessed value and year constructed can be displayed. Other on screen parcels can likewise be selected if one wishes to view their linked attributes. |
| 主权项 |
1. A method for retrieving and displaying geographic parcel boundary polygon maps comprising:
receiving by a server a request for a parcel boundary polygon map area for a selected parcel based upon a street address; searching by the server a multi jurisdictional digital parcel map database for the parcel boundary polygon record for the selected parcel boundary polygon having said street address, said parcel record including the geocoded polygon data which defines each of the line segments of the boundary of said selected parcel, along with the parcel records of adjacent and surrounding parcels, said parcel records including the geocoded parcel boundary polygon data which defines each of the line segments for each of the adjacent and surrounding parcel boundary polygons, said parcel records contained in separate spatial data files provided by jurisdictional service area data sponsors from two or more states, these spatial data files corresponding to the jurisdictional service areas in which the parcels are located, wherein the multi jurisdictional digital parcel map database is compiled by; (1) obtaining from said jurisdictional service area data sponsors separate spatial data files which contain said parcel boundary polygon records; (2) normalizing said obtained parcel boundary polygon records to a common spatial data protocol; and thereafter; (3) incorporating said normalized spatial data files into said multi-jurisdictional digital parcel map database; retrieving by said server said located parcel boundary polygon records for the selected parcel boundary polygon having said street address, along with the parcel records of adjacent and surrounding parcels that lie within or cross the extents of a bounding box whose coordinates equal the viewing extents of the screen upon which the map is to be displayed, said retrieved polygon records comprising a parcel boundary polygon data selection set, wherein, when the bounding box intersects more than one jurisdictional service area, all parcels lying within a first jurisdictional service area are collected into a first selection set, all parcels lying within a second jurisdictional service area collected into a second section set, the collection process repeated until separate selection sets are created for each jurisdictional service area crossed by the bounding box and thereafter; transmitting the so retrieved one or more selection sets of parcel boundary polygon map data for the selected parcel having said street address along with map data for the adjacent and surrounding parcels to a remote appliance having a screen display, wherein the transmitted parcel boundary polygon map data includes the selected parcel boundary polygon along with adjacent and surrounding parcel boundary polygons around the selected parcel, to fill the extent of the view area defined by said bounding box with parcel polygons surrounding the subject parcel, the selected parcel boundary polygon highlighted or otherwise differentiated. |
