topographic survey

例句：

1. 1. The topographic survey was conducted to map the terrain accurately.
   进行地形测量是为了准确地绘制地形图。
2. 2.The geologist conducted a topographic survey of the area before the construction began.
   地质学家在建设开始前对该地区进行了地形测量。
3. 3.The topographic survey revealed that the landform is characterized by steep slopes and deep valleys.
   地形测量显示，该土地形态特征为陡峭的斜坡和深邃的山谷。