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Old 08-23-2005   #1
msgraph
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Google Awarded Geographic Coord. Analysis Patent

Quote:
Some web documents may be of particular interest to users that reside in certain geographical areas. For example, web documents associated with an on-line newspaper may be of most relevance to the geographical area covered by the newspaper. Web documents associated with local businesses or organizations are additional examples of web documents that may be of particular interest to a geographical area. Thus, it can be desirable for a search engine to know whether a web document has geographical significance and when it does, the geographical locations associated with the web document.

Web documents often include postal addresses. In some situations, the postal addresses may help to define the geographical relevance of the web document. More specifically, a postal address can be converted to a geographic coordinate (e.g., latitude and longitude) value. The geographic coordinate can be used to calculate the distance between two locations. In the context of web documents and web searching, a geographically distant web document may be determined to be less relevant than a closer web document.

Extracting valid addresses from web documents and efficiently geocoding them (i.e., converting the address to geographic coordinate values) can be a difficult problem. Extracting postal addresses can be difficult because addresses can be written in a number of different formats and may not even be complete addresses. The zip code, for example, may be omitted from an address.
Quote:
One aspect of the invention is directed to a method for generating geographic coordinate information that includes receiving at least one term that specifies an address and accessing a table defining coordinate information for ranges of addresses to find an intersection of sets of rows in the table that correspond to the at least one term.
[...]
A second aspect of the invention is directed to a system for geocoding postal addresses. The system includes a table including rows that each correspond to a range of one or more addresses.
[...]
Yet another aspect of the invention is directed to a method for extracting addresses from a document.
Address geocoding

Pending Patent Application That References This
Systems and methods for clustering search results

Last edited by msgraph : 08-23-2005 at 10:47 AM.
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