利用OpenGL绘制立体地形模型图

Use of OpenGL to Draft Main Topographic Model Map

文中简要介绍了DTM的两种主要的数据结构 :不规则三角网 (TIN)和规则矩形格网 (GRID)。以规则矩形格网 (GRID)数据结构为例 :探讨了在以地形等高线图为数据源的基础上 ,如何利用OpenGL三维图形开发函数库来构造三维立体地形模型以及如何实现遥感影像与地形融合 ,绘制具有高度真实感的三维立体地形图。同时给出了具体的绘制实例。

Two kinds of main data structures of the DTM are briefly introduced in the paper, which are irregular net of triangulation (TIN) and regular rectangular grid (GRID). Taking the data structure of the GRID for example, the authors make a probe into the methods that are how to use OpenGL three-dimensional graph to develop function library so as to create three-dimensional topographic model and how to realize an interfusion of remote sensing image with topography in order to draft highly-true three-dimensional topographic map based on datare source of topographic contour-line map. Furthermore, a concrete drafting example is also given in the paper.