同时还启用了基本的等高线和隐线消除特性，最终的绘图是利用 splot 命令使用数学库内部的函数来创建的。
The base contour is enabled along with hidden line removal, and the sinc plot is created with the splot command using the internally available math library functions.
这是一幅由美国地形勘测出来的地形图，基本上，所有海拔等高线在一块陆地上。
So, a topographic map, this one from the US geological survey shows you, basically, all the level curves of an altitude function on a piece of land.
从规则高程格网中自动提取等高线是地理信息系统以及计算机制图的基本功能。
The extraction of contour lines from Grid DEM is a primary function in computer-aided cartography and GIS.
应用推荐