As rastergrid 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.
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。
2
Raster data is non-geometric data defined by a grid of values covering a spatial area.
光栅数据 是由覆盖空间区域的网格值所定义的非几何数据。
3
Taking a 10-meter-by-10-meter grid and making one observation for each intersection (100 observations) would constitute a raster dataset.