关键词： 空间关系；拓扑关系；方向关系；定性表示； GIS [gap=688]Key words Spatial relation; Topological relation; Directional relation; Qualitative representation; GIS
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directional relation model 方向关系模型
Qualitative reasoning of directional relation is one of the key theoretical issues in GIS. This paper focuses on the qualitative reasoning based on composition operation table of directional relation.
方向关系的定性推理是GIS中的一个重要的理论问题。
参考来源 - 基于方向关系组合运算表的定性推理 in C·2,447,543篇论文数据，部分数据来源于NoteExpress
The results showed that there were bi-directional relation and long-run equilibrium relationship.
结果表明：中国和美国棉花期货价格存在双向引导和长期均衡关系；
Spatial directional relation is one of the basic spatial constraints which represent geometric distribution relations of spatial objects.
空间方向关系是一类描述空间目标间位置分布的基本空间约束。
According to constitutive equations of rock anisot roipy, the relation between deviation of stratum and well inclination in directional drilling has been studied with the finite element method.
从岩石各向导性的本构方程出发，用有限单元法研究了地层倾角与定向钻井井斜之间的关系。
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