These measurements, and notebook sketches, would be necessary for later making ground-plan, elevation, and section drawings, and in very special cases for making three-dimensional models.

• 这些测量,和笔记本素描,会对比较迟的作地面-计划,海拔和区段图画是必需的,和在非常特别的情况为订定三度空间的模型。