Geospatial Data Abstraction Library 采用空间数据抽象库 data abstraction arrangement 数据的抽象层次 Classes And Data Abstraction 类别及资料型态 ..
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从待处理数据的抽象层次上分，融合技术可分为像素级、特征级和决策级三种。
From the abstract level of the data which is to be dealed with, the image fusion technique can be divided intoto pixel level, feature level and decision level.
取决于项目的复杂性，可以在两个不同层次的抽象和粒度上指定规范化数据模型。
Depending on the complexity of the project, a canonical data model may be specified at two different levels of abstraction and granularity.
安全管理员可以在接近于组织结构的抽象层次上控制对数据库的访问。
Security administrators can control access to their databases at a level of abstraction that is close to the structure of their organizations.
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