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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。论述了实现上述过程的基本算法。
The local vectorization of the continuous large format strip railway raster map with the railway line as the center can maintain the overall consistency of the large data volume floor plan and realize the rapid positioning and retrieval of the graphic. Discusses the basic algorithm to realize the above process.