The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 09, 2004
Filed:
Jul. 25, 2002
Hiroshi Miyahara, Tokyo-to, JP;
Other;
Abstract
In a satellite navigation system, map data stored in a server is partially updateable. The map data is produced to be divided into a plurality of sets of map data mutually-independent set by set, and stored in the server. The map data is updated every set of the divided map data, according to necessities. Such update operations are addition of a new set of map data, deletion of a certain set of map data, and replacement of a certain set of map data with a new set of map data. The map data is formed into a layered structure composed of data of layers, blocks, and objects. For reloading the map data, it is sufficient that only one or more sets of map data that has been updated are delivered from the server to each terminal. Hence an amount of map data to be downloaded can be reduced.