0838663-A2 is referenced by 34 patents and cites 11 patents.

An improved method and system for storage of geographic data on physical storage media. The geographic data are stored in a manner that facilitates and enhances use and access of the data by various navigation application functions in navigation systems that use the data. The geographic data includes a parcelization that separates the geographic data into parcels having less than or equal to a maximum parcel size but having at least a desired fill percentage. The parcelization method also provides for a division arrangement that facilitates addressing and identification of the parcels. According to a further aspect, the geographic data includes special nodal entities that are used to collapse complex intersections, such as roundabouts, cloverleaves, and divided highways, into simpler data representations.; The special nodal entities are associated with road segment data entities and used in a route calculation program in place of regular node entities. Further, the geographic data include a normalized attribute array that includes reoccurring combinations of certain selected attributes of the geographic data. Indices to the array are included in place of data corresponding to the selected attributes. When a navigation application program requests data, an entry in the normalized attribute table pointed to by an index in the data is used to return the requested data in the particular combination of attributes from the normalized attribute array. The geographic data is compiled by a method that facilitates access to the data on a physical medium. According to the compilation method, data files to be stored on the medium are organized into parcels.; The data records within the data files are identified by the parcel in which they are located. An arrangement of all the data files on the medium is determined and a parcel identification related to the medium is assigned to each parcel. Cross references between data records are updated to include the assigned parcel identifications and the parcels are stored on the medium.

Title
System and method for storing geographic data on a physical storage medium
Application Number
EP19970308527 19971024
Publication Number
0838663 (A2)
Application Date
October 24, 1997
Publication Date
April 29, 1998
Inventor
Crane Aaron I
US
Meek James A
US
Lampert David S
US
Smith Nicholas E
US
Nyczak Gregory M
US
Fernekes Robert P
US
Jasper John C
US
Bouzide Paul M
US
Ashby Richard A
US
Israni Vijaya S
US
Assignee
Navigation Tech
US
IPC
G01C 21/20
G09B 29/10
G08G 01/0969
G08G 01/0968
G06T 11/60
G06F 17/30
G01C 21/28
G01C 21/00
G09B 29/10
G08G 01/0969
G08G 01/0968
G06T 11/60
G06F 17/30
G01C 21/32
G01C 21/00
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