FAQ Detail

WHY IS THE ELEVATION ROUNDED TO THE 0.1 FOOT ON THE NGS DATASHEET?

The benchmark has been updated to a current elevation using GPS Leveling techniques. Since the elevation is reported to the closest 0.1 foot, then that published value is considered accurate to within one-half of that tenth of a foot, or ±0.05 foot. The benchmark has been updated to a GPS Leveling vertical accuracy criterion of ±2 centimeters. That corresponds to ±0.06 foot, which will round off to a value of 0.1 foot.