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。
The seven-grid difference format and nine-grid difference format of Helmholtz equation in right coordinate in the way of Taylor series method have been derived.
用泰勒级数法推出直角坐标系下亥姆霍兹方程的七点差分格式和九点差分格式；
According to the result, grid size affects the accuracy of derived information, especially in the flat areas. We should choose the DEM with right resolution.
研究表明，DEM的水平分辨率对地形信息的精确性有影响，网格的增大增加了DEM对地形信息的概括，应根据不同的需要选择不同分辨率的DEM。
The equivalent resistance is derived for distribution transformer load loss and line loss of planning grid, and the maximum current is calculated for each feeder according to their capacity ratios.
推导出规划网架的线路损耗和配变负载损耗的等值电阻，利用馈线容量比值估算馈线最大电流。
The equivalent resistance is derived for distribution transformer load loss and line loss of planning grid, and the maximum current is calculated for each feeder according to their capacity ratios.
推导出规划网架的线路损耗和配变负载损耗的等值电阻，利用馈线容量比值估算馈线最大电流。
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