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.
