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当前车载电子地图数据的更新主要采用离线版本更新的方式,该方法更新周期长,不能满足用户的现势性需求。该文设计了可增量的导航兴趣点数据库,提出了兴趣点增量数据结构,以动态扩展的增量形式存储导航兴趣点,并利用词头数字化压缩方法减少了数据量,最后通过增删词表计算车载导航设备和增量中心的检索文件及关联文件的差异,实现了兴趣点数据的增量更新。实验证明,该方法修改数据量小,更新速度快,能满足嵌入式导航设备兴趣点数据的动态增量需求。
Currently, the updating of the on-board electronic map data mainly adopts the offline version updating method, and the updating period of the method is long, which can not meet the current demand of the user. In this paper, an incremental navigation point of interest database is designed, an incremental point of interest data structure is proposed, the navigation points of interest are stored in incremental form with dynamic expansion, and the amount of data is reduced by prefix digitization compression method. Finally, Calculate the differences between search files and associated files of the car navigation equipment and incremental center, and realize the incremental updating of the points of interest. Experiments show that this method has the advantages of small amount of modified data and fast update speed, and can meet the dynamic incremental demand of the point of interest data of the embedded navigation device.