就制图的目的来说,所以需记录的高程是高出大地水准面 ( 海平面 ) 的高程.For cartographical purposes heights are necessarily recorded above the geoid ( sea - level ).较常见的是根据制图的比例来划分.More commonly the separation is based on the scale of the mapping.丁字尺 是工程...

“制图的”的英语可以翻译为：[计] cartographic ...