这颗卫星利用地面对激光的反射，让研究人员以极高的精度测量地形。
The satellite bounces laser light off the ground, allowing researchers to measure the terrain with extraordinary precision.
区域踏勘是定线测量的第一步。定线人员利用现有地形图，有时利用飞机对该区域进行探测。
Reconnaissance of the area as the first step, the locator, using available topographic maps and sometimes an airplane, explores the area.
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