电子地图多尺度显示模型研究

Research on the Multiscale Display Model of Electronic Maps

针对电子地图多尺度表达存在的问题，本文以系列比例尺矢量地图数据可视化为研究出发点，将制图综合处理与地图要素符号表达相结合，提出了一种基于栅格的电子地图面积载负量计算方法，研究确定了电子地图多尺度显示的关键比例尺；充分考虑不同尺度下地图要素的符号化特征，将综合算子和符号算子与显示尺度相关联，设计了基于单一数据源和基于多数据源的电子地图多尺度显示模型，改变了通常以经验值为主的、数据处理与符号表达相分离的电子地图多尺度显示方法。

In order to solve the problems in multiscale representation of electronic maps, the authors start from the raster map data visualization of different kinds of scales, combine the cartographic generalization processing with map feature symbol representation, put forward a method for calculating area load of electronic map based on raster, and make a research on the key scale of multiscale display of electronic maps. Taking the symbolization characteristic of map feature of different scales into full consideration, the generalization operator and symbolic operator are correlated with display scale, a multiscale display model of electronic maps based on single data source and multi data sources is designed, which change the traditional multiscale display method which mainly depends on the empirical value and separates data processing from symbolic representation.