基础电子地图多尺度显示模型的建立与应用

针对基础电子地图显示的交互性和动态性的特点,结合电子地图多尺度表达的理论,提出了显示尺度和多尺度显示模型的概念,并提出了电子地图载负量的计算方法,探讨了基于电子地图载负量变化曲线的特征点求解关键比例尺的基本原理,找出了建立相应的多尺度显示模型的基本方法。利用其原理和方法建立了中小比例尺基础电子地图多尺度显示模型,通过实际应用验证了其可行性。

Establishment and Application of Multi-scale Display Model in Basic Electronic Map

Based on analyzing the display characters of basic electronic map,and considering the effects of multi-factors,this paper proposes the concept of electronic map displaying scale and multi-scale displaying model.Then a method of calculating the electronic map load was proposed.After this,it discusses the keystone and method of ensuring key scale based on feature point in the map load curve,and analyzes the error in this model.Finally,it establishes multi-scale display classification system of national boundary electronic map.Based on this,multi-scale display national boundary electronic map is undertaken in electronic map display system,which achieves a better effect and proves the feasibilities of this method.