When the trace of railway tracks on a large size raster image of railway track plan is vectorized, valuable features emerge including sustained globe consistece and fast map location as well as map image retrieving.

• 对连续大幅面带状铁路线路光栅图进行以铁路线为中心的局部矢量化，可以保持大数据量线路平面图的整体一致性，并可实现图形的快速定位及检索。