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采用分层路网模型的车辆导航电子地图,在多尺度显示中,会出现同一显示尺度下不同区域道路显示密度不均匀的问题,大量区域显示的道路十分稀疏,影响了导航引导效果。该文提出了道路显示密度的模糊均匀化方法,利用道路显示密度的模糊评价方法建立路网层级、显示尺度和显示区域3种显示要素的最优对应关系,进而实现全地图道路的均匀合理显示。为保证方法适用于计算能力较低的嵌入式导航环境,设计了分离式实现机制。实验结果表明:该方法能够显著提高道路显示的均匀性,实际导航时额外占用的计算资源很少,适用于嵌入式导航设备。
In the multi-scale display, the road display density of different areas under the same display scale will be uneven. The roads displayed in a large number of areas are very sparse, which affects the navigation guidance effect. In this paper, a method of fuzzy uniformization of road display density is proposed. The road network level, the display scale and the optimal correspondence between the three display elements in the display area are established by using the fuzzy evaluation method of the road display density so as to achieve a uniform and reasonable display of the road in the whole map . In order to ensure that the method is suitable for the embedded navigation environment with low computational capability, a separate implementation mechanism is designed. The experimental results show that this method can significantly improve the uniformity of road display, and the extra computing resources used in actual navigation are very few and suitable for embedded navigation devices.