To improve the spatial data representation for their subsequent processing, a description for spatial objects is indispensable.
为了提高空间数据的表示和处理能力，对空间对象进行准确的描述是非常必要的。
To improve the spatial data representation for their subsequent processing, a description for spatial objects is indispensable.
为了提高空间数据的表示和处理能力，对空间对象进行准确的描述是非常必要的。
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