地表的起伏及地层中各界面在平面上各点的深度变化,过去一般采用等高线的方法来表示(图1),这种方法的缺点是不够直观。近年来,开始采用立体图形来表示地貌的起伏和地下各层界面深度的变化(图2)。由于立体图形的直观性强,它为研究、分析工作带来了很大的方便。例如在分析地质构造中,利用地球物理探矿方法测得的数据,通过电子计算机的计算和分析,求得地下某界面的起伏变化,然后由电子计算机的输出设备(x—y The ups and downs of the earth’s surface and the changes of the depth of each point on the plane in the strata are generally represented by contours (Figure 1). The disadvantage of this method is not intuitive enough. In recent years, began to use three-dimensional graphics to represent the ups and downs of the topography and the depth of the underground layer changes in the interface (Figure 2). Due to the intuitiveness of the stereoscopic graphics, it brings great convenience to research and analysis. For example, in the analysis of geological structure, geophysical prospecting method using the data measured by computer calculations and analysis of the ups and downs of an underground interface was obtained, and then by the computer’s output device (x-y