04982332 is referenced by 64 patents and cites 7 patents.

A road data generating method for use in an on-board navigation system. Points on roads in a map are expressed in numerical form and memorized as map data previously, and co-ordinates of the present position of the vehicle and the compass direction of the movement of the vehicle are detected and the distance to a point on a road nearest to the present position and the angle of the road at that point are determined on the basis of the map data, as decision values for the generation of road data, every time a certain distance is traveled by the vehicle. Judgment is made as to whether or not there already is registered learning data in the vicinity of the present position when the decision values exceed the predetermined values, and standard deviations of the distance and the angle with respect to the registered learning data are calculated when there is the registered learning data. The registered learning data is registered as the road data if the standard deviations are equal to or smaller than predetermined values.

Title
Road data generating method for use in an on-board navigation system
Application Number
7/330272
Publication Number
4982332
Application Date
March 29, 1989
Publication Date
January 1, 1991
Inventor
Takashi Kashiwazaki
Kawagoe
JP
Masaki Saito
Kawagoe
JP
Agent
Fleit Jacobson Cohn Price Holman & Stern
Assignee
Pioneer Electronic Corporation
JP
IPC
G06F 15/50
View Original Source