基于制图规范表达的制图渲染引擎研究

由于地理信息爆炸式增长，将不断更新的地理信息转化成符合专业性制图规范的地图的快速制图技术成为网络地图服务发展的瓶颈，地图渲染引擎是解决这一瓶颈的有效手段，因此，本课题将以研究制图渲染引擎原理为目标，以研究其依赖的数字制图模型为重点，对其信息结构、转换机理和制图表达的理论和技术展开研究。具体研究内容包括，进一步研究代数结构地图制图模型（c= f(u(*), v(*))）的信息（语义）结构；研究基于视觉原理的制图规范特征及其形式化技术；探讨此模型中地理要素位移变换u(*)和制图符号同核变换v(*)的特征及其在实施制图规范性原则的函数构造作用；构建基于地理信息语义的地图表达模型；最后以基础地理数据为应用对象，开发具有专业性制图规范表达的制图渲染引擎技术，为实现专业化和规范化快速制图技术服务奠定理论基础并提供技术开发参考。

Rapidly making maps from constantly updated geographic databases by means of professional cartographic specifications has been challenging web services of geographic information due to a proliferation of geographic information. Cartographic rendering engine is proposed as an available solution to that problem. Aiming at exploring the principles of cartographic rendering engine, this study will investigate information structure, transfer mechanism of geographic information and cartographic representation by stressing on digital cartographic modeling on which the rendering engine lies. Semantic information of the algebraic cartographic model will be investigated; cartographic specifications and the features of visual perception will be examined in terms of formalization or computation; the displacement transform u() of geographic features and the equivalent-kernel transformation v() of cartographic symbols are analyzed regarding to their functions within the model to implement cartographic specifications; and consequently cartographic portrayal (representation) model is set up in the sense of semantic geographic information. Finally, fundamental geographic data being taken as the benchmark for validating the theory and methodology, a cartographic rendering engine is developed for rendering maps in the form of professional cartographic specifications so as to provide rapidly map-making services on the internet with a solid theoretical base and technical guidelines for development of the rendering engines.