测量时必须严格按照规定的测点位置和测量项目的定义﹐使用可靠的测量仪器进行。
Measurements must be in strict accordance with the provisions of the measuring point and measuring the project definition, the use of reliable measuring instruments.
但实际情况是墙体模型阶次不仅与墙体本身特性有关，而且还受到墙体所在位置和测量环境的影响。
But the reality is that the order of the wall model, which is impacted not only by the characteristics of the wall itself, but also by the location of the wall and measuring environment.
通过测量信号在卫星和天线之间传播所需的时间，汽车的位置可以被锁定在100米误差之内。
By measuring the time required for a signal to travel between the satellites and the antenna, the car's location can be pinned down within 100 meters.
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