| 摘要 |
PURPOSE:To provide a map data base for a navigation system for which files are constituted with map data as the sets of characters (including symbols) and numerical data and a map retrieval and display system using the map data base. CONSTITUTION:This map data base is constituted of a map data index file, plural map data files 30 classified by a display level and a display range and an annotation file. The map data files 30 are retrieved and specified by latitude and longitude obtained by referring to the map data index file. The map data file 30 are constituted of (n) pieces of carrier data groups 32, the respective pointers 33 of the point data groups of the map data files, the respective pointers 34 of segment data groups and the respective pointers 35 of surface data groups. |
