Variable-Scale Visualization in Navigation Electronic Map

The mobile condition and the limited displaying screen lead to the map visualization in vehicle navigation much different from that under common computer monitor.In order to satisfy the requirements that in the same time get rough information in a wide spatial range and the detailed objects in a small range near to the running vehicle,the technology of varia-ble scale visualization is applied in the navigation electronic map to obtain the effect of“mag-nifying near area and compressing far area”,just like to look at a distorting mirror.Different exaggeration area has been designed including the circular and the rectangular regions.The object is visualized in a self-adaptable way to suit different scales in different partitioning are-as.The variable measure also gets investigation according to the variable scale properties and an improved measure method is presented.