Azimuth closure at an azimuth check point is measured in which unit?

Azimuth closure at an azimuth check point is measured in which unit?

• A. Seconds of arc
• B. Degrees
• C. Radians
• D. Meters

Answer: (A)

Azimuth closure is an angular error, so it represents how far the measured azimuth deviates from the true value. Since it’s an angle, the natural way to express this small discrepancy is in angular units. Seconds of arc are used because they provide a fine, conventional scale (1 arc-second = 1/3600 of a degree) to capture tiny errors typical in precise surveying. Degrees would be too coarse to reflect small closings, radians are not commonly used in field results and would require extra conversion, and meters would incorrectly indicate a length. So the azimuth closure is reported in seconds of arc.

Azimuth closure is an angular error, so it represents how far the measured azimuth deviates from the true value. Since it’s an angle, the natural way to express this small discrepancy is in angular units. Seconds of arc are used because they provide a fine, conventional scale (1 arc-second = 1/3600 of a degree) to capture tiny errors typical in precise surveying. Degrees would be too coarse to reflect small closings, radians are not commonly used in field results and would require extra conversion, and meters would incorrectly indicate a length. So the azimuth closure is reported in seconds of arc.