Stadia marks, also called stadia lines or stadia hairs, are crosshairs on the reticle of a theodolite or other surveying instrument that allow stadiametric rangefinding. == Etymology == The term stadia mark derives from the obsolete unit of distance, the stadion, derived from the Greek measurement of a stadium.
Stadia marks, also called stadia lines or stadia hairs, are crosshairs on the reticle of a theodolite or other surveying instrument that allow stadiametric rangefinding. == Etymology == The term stadia mark derives from the obsolete unit of distance, the stadion, derived from the Greek measurement of a stadium.
Source: Wikipedia "Stadia mark" · CC BY-SA 4.0
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