collimation-method
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collimation method
Also called: height of instrument method
HB50
method of land surveying in which the first sight is taken to determine the height of the line of sight of the instrument; thereafter the level of any other point can be worked out quickly by subtracting the staff reading from the height of the line of sight
The main advantages are that calculations of level can be (and usually are) made during the survey, and that it provides a convenient way of obtaining the levels of many points from one set-up.