针对目前地理要素多尺度建模的热点问题，剖析构建多尺度空间数据模型的关键技术，以路网要素为例，挖掘地理要素多尺度抽象表达的机理，利用多尺度扩展E-R方法，提炼多尺度抽象表达目标间的各种尺度、层次、语义、映射等层次语义关系，实现GIS中地理要素多尺度概念模型的设计。

Multi-scale representations for geographical entities is one of the research focuses in the field of multi-scale spatial database. Compared with the traditional GIS model, the essential modeling mechanism and strategies for building a multi-scale data model are explored. Taken the road feature as an example, a detailed description of multi-representatlon elements in the model are provided. This model includes abstract data types and attribute-value domains for geographical features at different scales, as well as the scale, semantic, and mapping hierarchical relations among features. An appropriate multi-scale conceptual model is given in detail with the multi-scale extended E-R method.