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。
Aiming to rasterize topological region data in GIS, we present a fast algorithm named as difference boundary-labeling and accumulating-scan algorithm.
由于GIS中的栅格网络数据可以直接作为有限差分的网格，二维数值模型可用有限差分来求解。
As raster grid networks of digital elevation model in GIS can be used as the finite difference mesh, the continuity and momentum equations are solved numerically using the finite difference method.
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