What is the formula used for stadia lines?
What is the formula used for stadia lines?
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: 0.500m x 100 = 50 m.
What is stadia measurement?
Greek unit of measurement, the stade, the distance covered in the original Greek footraces (about 600 feet [180 metres]).
What is stadia interval in surveying?
stadia- 1 A method of surveying in which distances and elevations are obtained by observing the interval on a graduated, upright rod (stadia rod) intercepted by two parallel horizontal lines (stadia hairs or stadia wires) in a surveyor’s transit set up at a distance from the rod.
How do you calculate stadia intercept?
(I) rod intercept, or stadia interval. (i) spacing between stadia hair. (f/i) = k = 100: stadia interval factor. C = (c + f) approximately 0, Stadia constant.
How accurate are stadia lines?
For distances less than 150 m and using stadia or self-reduction methods, almost all investigators reported accuracy values in the range 1/600 – 1/2100, with elevations being determined to an accuracy ranging from ± 36 mm to ± 59 mm.
What are the three types of telescope used in stadia surveying?
The telescope used in stadia surveying are three kinds, The Simple external focusing telescope. The external focusing anal lactic telescope (porro’s telescope). The internal focusing telescope. The first type is known as stadia theodolite, while the second type is known as tacheometer.
What is the least count of stadia rod?
Stadia rod is of one piece having 3 to 5 meters length. The smallest subdivision is usually 5 mm.
How many cross hairs are there in theodolite?
In this method, the telescope of the theodolite is equipped with two additional cross hairs, one above and the other below the main horizontal hair at equal distance. These additional cross hairs are known as stadia hairs. This is also known as tacheometer.
How do you calculate the distance between two stadia?
The formula to calculate distance is D=R*S (Distance = Rod Reading Multiplied by the Stadia Constant.) The stadia constant is indicated on your instrument’s Users Manual. Most surveying Instruments have a Stadia constant of “100”.
What is the stadia method?
The Stadia is a method of measuring distances rapidly with a telescope (usually on an engineer’s transit or an alidade) and a graduated rod. The term stadia comes from the plural of the Greek stadion, the word for a distance of 185 to 192 metres (607-630 ft).
What is stadia marking?
An instrument equipped for stadia work has two horizontal stadia marks spaced an equal distance from the center crosshair of the reticle. The distance between the stadia markings usually have a stadia interval factor of 100.
How do you read a rod on a stadia rod?
Sight on the forward bench mark in the traverse and record the rod readings at the top stadia hair and the bottom stadia hair. Without moving the instrument, take a backsight on the previous bench mark in the traverse and record the rod readings at the top stadia hair and the bottom stadia hair.
