| 摘要 |
PROBLEM TO BE SOLVED: To shorten the time of work for changing the driving speed of road data by managing the road data for every road kind when performing the changing process of road speed data on a digital map. SOLUTION: Data for display are prepared for displaying digital map data 201 on a display 305, the prepared data for display are displayed on the display 305, and the road speed is changed while designating plural links in a map picture on the display 305. The digital map data 201 are composed of a node table 701 composed of node numbers, coordinates of nodes, number of adjacent nodes, adjacent node numbers and connection link numbers, link table 801 composed of link numbers, road classes, road numbers and control zones, and road table 309 for every road king composed of road number and road speed. Then, link retrieval and road retrieval are performed at a high speed while using these tables 701, 801 and 309. |
