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9. ANGLE MEASUREMENT
This instrument can be used for stadia surveying. Measurement by stadia is a convenient method for
measuring distances (D) with the stadia hairs of the instrument, in combination with a graduated rod, such as
a leveling rod or stadia rod, which is preferable for long distances. The distance from the center of the
instrument to the rod is found by sighting through the instrument on the rod and multiplying the stadia interval
(d) by 100. The stadia interval is the distance between the top stadia hair reading and the bottom stadia hair
reading.
1. Set the rod on the point to be surveyed.
2. Sight through the telescope of the leveled instrument and determine the distance or interval, “d”, between
the top stadia hair reading and bottom stadia hair reading of the rod.
The horizontal distance “D” from the center of the instrument to the rod is equal to 100 times the stadia
interval, “d”.
D=100 × d
9.6 Stadia Surveying
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