| 摘要 |
<p>An electronic map (22) is output based on map data which comprises information on a current configuration (31, 36) for a plurality of map objects and historical attributes for at least some map objects. The historical attribute associated with a map object includes information on a historical configuration (32, 37) of the respective map object in the past. A time selection input is received at a user interface. The map data is processed to identify a map object (30; 35) which has a current configuration (31, 36) different from a historical configuration (32, 37) at a time in the past which is determined based on the time selection input. An optical output device (20) is controlled to output a graphical representation (31, 32, 36, 37) of the identified map object (30; 35) which is dependent on both the current configuration (31, 36) and the historical configuration (32, 37) of the identified map object.</p> |
