中文摘要：

为了提高电子地图数据的精度和画面显示的速率,对地图数据格式加以改进,新增isvl参数准确标识出被描绘数据情报的尺度,对检索的数据缓存做了优化性能管理,依据地图数据的格式提出了坐标变换、数据解析和描画范围定位的准确算法,采用双缓冲机制绘制地图;经实验证明,使用该套方案实验的结果,具有以下特性：1）高精度,多尺度;2）画面合理的表达了空间关系;3）支持实时动态快速显示;可应用到电子地图的研发中。

英文摘要：

The electronic map display is one of the key technologies for car navigation. This paper presents a new multi-scale elec tronic map program, which improves map data format, retrieves tile data cache to optimize performance management, in accordance with the format of the map data presents coordinate transformation, data parsing and painted the scope of positioning accuracy algorithm, using double buffering mechanism draw maps. The experiment proved that the results of using the set of programs designed have the characteristics which good maps have： 1） High precision, multi-scale; 2） The picture express the spatial relationships reasonably and accurately; 3） To sup- port real-time dynamic fast display.