Conversion from one datum to another requires specialized algorithms and trained users, and is not supported by the Spatial Extender.

从一种大地基准点转换到另一种需要专门的算法，而且要求用户受过训练，Spatial Extender不支持这种转换。

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Besides of uniform spatial reference and positioning datum, modern war must unite all the geographic spatial information needed by all arms of services to a organic integer scientific and reasonably.

除了要求有统一的空间参照和定位基准以外，还必须将诸军兵种所需的地理空间信息科学合理地统一在一起，形成一个有机整体。

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Spatial index plays an important role in the organization and searching of datum for GIS. People searching spatial index have proposed many algorithms of it.

空间索引在GIS数据的组织和检索中具有重要的作用，研究者对空间索引技术进行了广泛的研究，提出了许多索引算法。

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