Method for transmitting information on position on digital map and device used for the same

• US 8,086,401 B2
• Filed: 05/20/2005
• Issued: 12/27/2011
• Est. Priority Date: 12/08/2000
• Status: Expired due to Term

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Adachi, Shinya
• Primary Examiner(s): Tran, Khoi
• Assistant Examiner(s): Jen, Ian
• Application Number:
  US11/133,591
• Publication Number:
  US 20050216189A1
• Time in Patent Office: 2,412 Days
• Field of Search: 701/208, 701/210, 701/214, 340/995.1, 340/995.11, 340/995.14, 340/995.22, 340/995
• US Class Current: 701/208
• CPC Class Codes: G01C 21/30 Map- or contour-matching
• CPC Class Codes: G08G 1/0969 having a display in the form of a map
• CPC Class Codes: G09B 29/10 Map spot or coordinate position indicators; Map reading aids optical projection apparatus per se G03B

Abstract

A method of transmitting position information of a digital map capable of transmitting a position on a digital map efficiently and accurately in which a transmitting side transmits position information including coordinate series information for specifying a vector shape on a digital map and a receiving side execute map matching by the coordinate series information to thereby identify the vector shape on the digital map, the coordinate series information is transmitted by adding azimuth information of a coordinate point included in the coordinate series information thereto. By transmitting shape data by adding the azimuth information thereto, accuracy of matching can be promoted and necessary time for matching can be shortened.

Claims

1. A system for identifying a road segment, which is specified on a transmitting side digital map stored in a transmitting apparatus, on a receiving side digital map stored in a receiving apparatus and different from said transmitting side digital map, said system comprising:

said transmitting apparatus that creates location information and transmits said created location information to said receiving apparatus, wherein said location information includes coordinate series information which represents a road shape of said road segment by coordinates of intersections included in said road segment and coordinates of nodes located on one or more links between two adjacent intersections of said intersections, and azimuth information which represents an azimuth of a curve of said road shape at each of said intersections and said nodes; and

said receiving apparatus that receives said location information and identifies said road segment on said receiving side digital map by matching each of said intersections and said nodes included in said transmitted location information with a point of each of one or more matching candidate points located on a road of said receiving side digital map, wherein said matching candidate points are proximate to each of said intersections and said nodes to be matched and selected so that an azimuth difference between an azimuth of said road of said receiving side digital map at each of said matching candidate points and said azimuth of said curve of said road shape at each of said intersections and said nodes to be matched is smaller than a prescribed value.

2. The system according to claim 1, wherein said azimuth of said curve of said road shape is an intercept azimuth at each of said intersections and said nodes, and said azimuth of said road of said receiving side digital map is an intercept azimuth at each of said matching candidate points.

3. A transmitting apparatus for transmitting said location information to said receiving apparatus in said system according to claim 1.

4. A receiving apparatus for identifying said road segment represented by said location information received from said transmitting apparatus in said system according to claim 1.