流域内自然地理要素的空间差异导致了流域水文过程的时空变化。
Spatial heterogeneity of physiogeographical components leads to spatial and chronological changes of hydrological process in watershed.
地理要素的分类代码信息通常以主代码和辅代码的不同组合模式来表达。
The classification and codes information of geographic features is usually expressed by different combination patterns of major and minor codes.
对地理要素的多尺度表达（多重表达）是当前多尺度空间数据库领域的研究热点之一。
The multi-scale representations (multi-representations) for geographical entities is one of research focuses in the field of multi-scale spatial database.
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