The five-grid difference format of Helmholtz equation in slanting coordinate have been derived.
推导出斜坐标系下，亥姆霍兹方程的五点差分格式；
Spatial data Grid derived from data Grid. In the dissertation, the key technology of Spatial data Grid, including metadata catalog, data broker and Grid Spatial Database are studied.
空间数据网格来源于数据网格，本文对它的关键技术-元数据目录、数据代理和网格空间数据库进行了探讨研究。
Grid city, which is derived from the method of grid to establish city space structure and planning, is one of the basic modes of city form.
从古至今，以方格网的方法构筑城市空间结构和布局所形成的方格网城市是城市形态的一种基本模式。
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