The basic steps to create a data model from scratch involve realizing the business requirements that eventually get translated into a data model.

从头创建数据模型的基本步骤涉及到识别业务需求，这些业务需求最终会转换为数据模型。

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Based on the requirements of some process objects on data acquisition, the basic structure and functions of data acquisition system are described and compared with other conventional systems.

从一些过程对象对数据采集的需要出发，阐述了数据采集系统的基本结构和功能，并与其它常规系统进行了比较。

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Increasing requirements of spatial data result in the appearance of the spatial data basic structure, and make GIS standards increasingly important.

对空间数据不断增长的需求和关注导致空间数据基础结构的出现并使GIS标准日趋重要。

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