Aiming to rasterize topological region data in GIS, we present a fast algorithm named as difference boundary-labeling and accumulating-scan algorithm.

针对GIS面状拓扑数据，提出了一种快速栅格化算法———差分边界标志与累加扫描算法。

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This data recovery software can fast scan disk sectors, rescue the damaged files and copies the correct data to hard disk as possible as it can.

它能够快速地扫描扇区，拯救已损坏的文件，并仅可能地将正确的数据复制到硬盘中。

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