【摘要】 在PDA上绘制等值线是移动GIS的一项重要内容。本文介绍了以MapX Mobile控件为图形平台,在Embedded Visual C++4.0环境下编程绘制等值线的方法,包括用逐点插入法生成Delaunay三角网,基于三角网的等值线追踪方法,及等值线图的显示、放大、缩小、漫游、属性查询等。并将其移植到PDA环境下,以实际离散高程点为实验数据来绘制等高线图,验证了上述方法的可行性。更多还原

【Abstract】 It is an important issue to make isoline on the embedded terminal device PDA. A method of Isoline’s making based on MapX Mobile, using Embedded Visual C++ 4.0, is introduced in this paper. In this method, Delaunay triangulation is generated using incremental insertion, isolines are traced based on Delaunay triangulation. The main functions, such as isoline’ display, enlarging, shrinking, roaming, attributes querying and so on, are realized on PDA. In the end, real discrete elevation data is used as an example to examine this method, which proves the method is practical.更多还原