A measurement or reading taken back towards a point of known elevation, used to calculate the height of the surveying instrument (theodolite, transit, total station).
A measurement of a previously shot point, used to set the angle to zero when occupying a new position.
To shoot a backsight.
The ability to foresee or prepare wisely for the future.
The reading of the leveling staff in its unchanged position when the leveling instrument has been taken to a new position; a sight directed backwards to a station previously occupied. Cf. Foresight, n., 3.
The act or the power of foreseeing; prescience; foreknowledge.
Action in reference to the future; provident care; prudence; wise forethought.
Any sight or reading of the leveling staff, except the backsight; any sight or bearing taken by a compass or theodolite in a forward direction.