导航电子地图的变比例尺可视化

将变比例尺可视化技术应用到导航电子地图可视化中,实现了“近大远小”的“哈哈镜”显示效果。设计了圆形、矩形两种不同放大区域,讨论了不同比例尺区域目标的自适应可视化,并根据变比例尺地图变形特点,对距离量算方法进行改进,以克服该种可视化地图距离感弱的缺点。

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.