斜角坐标系图的专题地图量化信息可视化方法

引入量化图形中种类最为丰富的斜角坐标系图,作为专题地图的主题图形,用于统计地图制作,拓展了专题地图量化信息可视化的表示方法。重点介绍了基于斜角坐标系图的专题地图量化信息可视化应用程序开发的设计思想,通过分析斜角坐标系图形的构图特点和可视化变量,抽象出了一个基础菱形。基于MapInfo软件中的Map-Basic宏语言,设计了斜角坐标系量化图形基础菱形的标准过程,通过调用基础菱形的标准过程,可以实现单坐标系图形和组合图形的绘制。作者借助MapBasic的工程文件连接各个应用程序模块,开发出了以单坐标系、双坐标系和中心组合图形模块为中心的专题地图量化信息可视化应用程序,并实现了量化图形自动排序、手工排序、图形整体移动等功能。最后以河北省1990、1995、1998年第一、二、三产业产值的实际数据,绘制了以三坐标系中心组合图形为主题图形的专题地图,对引入的斜角坐标系量化图形进行应用效果的实例验证。

A Study on the Quantitative Information Visualization of Thematic Map by Using Oblique Coordinate System

This article uses the quantitative graph of oblique coordinate system as a way to express the quantitative information in the thematic map, which expands the expression ways of the thematic map. The author also introduces the application program' s design idea of the quantitative information visualization of thematic map by using oblique coordinate system graphs. By analyzing the structure and visualization variables of oblique coordinate system graphs, the author abstracts a basic rhombus. Based on the MapBasic macro language of the Mapln-fo software, the author designs a standard sub of the basic rhombus of oblique coordinate system graphs. The single coordinate system graphs, the double coordinate system graphs and the multi coordinate system graphs are all composed of the basic rhombus. The drawing models of the single, the double and the multi coordinate system graphs are developed by calling the standard sub of the basic rhombus. In the Mapbasic development environment, the application program uses the Mapbasic project file to connect each model. Based on this mode, the author developed an application procedure of the quantitative information visualization of thematic map by using oblique coordinate system graphs. The application procedure has the single coordinate system graphs, the double coordinate system graphs and the multi coordinate system graphs models. Also the application procedure has some special functions such as graphs sorted automatically or sorted by hand, adjusting the graph's location by the mouse. At the end of this paper the author drews a thematic map by using the data of Hebei province, which using the graphs of the three coordinate systems combined at center. In this way, the author validates the graph' s application effect in thematic mapping.