This paper discusses how to establish multilayer storage structure and automatically reduce small scale graph from large scale mapping database by theory of changed-focuses Datum Model.
作者通过变焦数据模型原理，探讨如何建立多层存贮结构，将数字地图中的大比例尺地图数据库自动导出小比例尺图形。
The big names in geolocation have tools for mapping large-scale structures with near global coverage.
地理定位领域中的巨头都拥有各自的地图绘制工具，这些工具几乎将全球范围内的大型建筑物都收录其中。
The method is suitable for large-scale mutant bank screening as well as large mapping populations with characteristics of maintaining relatively high level of DNA purity and concentration.
该方法特别适用于精细作图群体和大型突变体库的筛选鉴定，不仅通量大、速度快，而且可以确保足够的DNA浓度和纯度。
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