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 .
6-560: [REDACTED] Look up stadia in Wiktionary, the free dictionary. Stadia may refer to: Measurements [ edit ] Stadia mark , crosshairs on the reticle of a theodolite or other surveying instrument Stadiametric rangefinding (also stadia method), a technique of measuring distances with a telescopic instrument Stadion (unit) (plural: stadia), an ancient Greek unit of length Other uses [ edit ] Google Stadia ,
12-429: A defunct cloud gaming service Helsinki Polytechnic Stadia , a multidisciplinary institution of higher education Stadia (Caria) , a town of ancient Caria Stadium (plural: stadia), a place or venue for (mostly) outdoor sports, concerts, or other events See also [ edit ] All pages with titles containing Stadia Stadion (disambiguation) Stadium (disambiguation) Topics referred to by
18-529: Is different from Wikidata All article disambiguation pages All disambiguation pages Stadia mark The term stadia mark derives from the obsolete unit of distance, the stadion , derived from the Greek measurement of a stadium. Several different stadia were defined, such as the Greek stadion and Egyptian stadion . A typical surveyor's instrument reticle has two pairs of stadia marks. One pair are on
24-403: The formula for distance is where For example, a typical stadia mark pair are set so that the ratio is 100. If one observes a vertical length on a stadia rod, rule or levelling rod with the telescope and sees that the rod spans 0.500 m between the marks (the stadia interval ), then the horizontal distance from the instrument to the rod is: In the adjacent image, the upper stadia mark
30-433: The horizontal centreline and the other on the vertical cross hair. Each functions in the same manner and are placed for measuring on either axis. The stadia marks are set a specific length apart. This length is chosen so that there is a fixed, integer ratio between the difference of the rod readings and the distance from the telescope to the rod. This ratio is known as the stadia constant or stadia interval factor . Thus
36-409: The same term [REDACTED] This disambiguation page lists articles associated with the title Stadia . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Stadia&oldid=1189779534 " Category : Disambiguation pages Hidden categories: Short description
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