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.
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。
In the model, approximate quality difference of two evaluations in the same level is computed by rough sets, and the importance degree is determined by difference. The model is validated by instance.
应用粗糙集理论计算相同层次两两评价指标的近似质量差，根据差的大小确定指标重要性，并通过实例证明了该模型的合理性和正确性。
In the model, approximate quality difference of two evaluations in the same level is computed by rough sets, and the importance degree is determined by difference. The model is validated by instance.
应用粗糙集理论计算相同层次两两评价指标的近似质量差，根据差的大小确定指标重要性，并通过实例证明了该模型的合理性和正确性。
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