线性参照系统下的嵌套金字塔模型构建

针对线性参照虚拟场景构建中缺乏有效的空间数据模型的问题，本文以金字塔模型、空间索引结构和动态分段等相关研究为基础，提出了线性参照系统下的嵌套金字塔模型构建方法。首先，结合线性场景数据特征，对动态分段技术进行拓展，增加垂直方向结构化金字塔模型；然后，将线性参照在多尺度下进行静态分段，对相互独立的弧段分别进行存储，构建静态分段金字塔模型；最后，建立统一的映射关系，构建嵌套金字塔模型，从而提升该模型在各尺度间切换时的连贯性，完成线性场景多源数据的统一组织与集成管理。

Construction of nested pyramid model based on linear reference

In view of the lack of effective spatial data model in the construction of linear reference virtual scene,this paper proposes a nested pyramid model construction method based on linear reference based on the current mainstream pyramid model,spatial index structure and dynamic segmentation. Firstly, the dynamic segmentation technology is expanded by combining with the data characteristics of linear scenes,and the vertical structured pyramid model is added. Secondly,the linear reference is statically segmented in multi-scale,the independent arcs are stored separately,and the static segmented pyramid model is constructed.Finally,a unified mapping relationship is established,and a nested pyramid model is constructed,so as to improve the continuity of the model when switching between scales and complete the unified organization and integrated management of multi-source data of linear scenes.