sta·dia ˈstā-dē-ə : a surveying method for determination of distances and differences of elevation by means of a telescopic instrument having two horizontal lines through which the marks on a graduated rod are observed. also : the instrument or rod.
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stadia- 1 A method of surveying in which distances and elevations are obtained by observing the interval on a graduated, upright rod (stadia rod) ...
The process of measuring distances and elevations by observing through a telescope the distance intercepted on a rod between two horizontal cross-hairs.