FE Civil Engineering Exam Prep

Answer: C - Terrain errors are the least likely type of errors affecting the measured value for a horizontal angle when compared to the other listed error types.

The impact of instrument errors can be mitigated by properly adjusting the devices used and by using systematic observation procedures. Environmental errors affecting horizontal angle measurement may be due to temperature differentials and the horizontal refraction of the line of sight. Personnel errors can be prevented through proper training and following standard procedures.