Method and apparatus for transmitting position information on a digital map

A position information transmission method for transmitting and receiving road shape information and event information, and identifying an event position, the method comprising the steps:

• intermittently selecting nodes in a target road section on a digital map;
• determining positions of the selected nodes;
• transmitting road shape information and event information wherein the road shape information includes coordinate data of the selected nodes and designates a target road section;
• executing a map matching based on the road shape information including coordinate information of the selected nodes;
• obtaining a road between the selected nodes by using a route search;
• identifying the target road section on the digital map;
• and
• specifying an event occurring position within the target road section based on the event information;
• wherein the event information designates an event occurring position by using a relative position within target road section,
• wherein the steps of intermittently selecting nodes and transmitting road shape information are executed at a transmitting side, and
• wherein the steps of executing a map matching, determining positions, obtaining a road, identifying the target road section, and specifying an event occurring position are executed at a receiving side.