矢量电子航海图的分割方法研究

为解决嵌入式系统应用电子航海图出现的单幅图存储量、图廓范围过大,以及图幅重叠等问题,以SHAPE格式图为例,设计并实现了矢量电子航海图的分割方法。采用多边形布尔运算法则处理多边形的剪裁,不限制实体和剪裁多边形类型,使得该分割方法不仅适用于等经纬网格分割,也适用于不规则分割。应用该分割方法对海图数据进行预处理,可以适应硬件资源有限的嵌入式应用,从而提高系统设计的自由度、降低总体成本,促进电子海图系统的推广。

Clipping Method of Vector Electronic Navigation Chart

For solving the problem of too big amount and size of the storage of single chart as well as chart overlapping in the application of electronic navigation chart in embedded system,a clipping method for vector electronic chart is designed,taking SHAPE format vector chart as an example.The method uses Boolean operator to cope with polygon clipping without limitation of polygon types so as to be suitable for clipping with equal longitude-latitude grid and for irregular clipping.New charts after the clipping can be used in resource limited systems.It provides more freedoms for hardware design as to reduce overall cost and promote the applications of ECDIS.