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A back sight
backsight (plural backsights) The rear sight of a firearm. (surveying) A measurement or reading taken back towards a point of known elevation, used to calculate the height of the surveying instrument (theodolite, transit, total station).
backsight (plural backsights) The rear sight of a firearm. (surveying) A measurement or reading taken back towards a point of known elevation, used to calculate the height of the surveying instrument (theodolite, transit, total station).
See lessOrientation of a plane table by solving two point problem is only adopted when
When are the two-point problems used in plane table surveying? The orientation of a plane table by solving two-point problems is adopted when the given points are inaccessible.
When are the two-point problems used in plane table surveying? The orientation of a plane table by solving two-point problems is adopted when the given points are inaccessible.
See lessIf the sight distance (S) is equal to the length of the vertical-curve (2l) joining two grades g1% and – g2%, the height of the apex will be
An alternative method to determining the minimum length of a sag vertical curve (L) is to multiply the rate of vertical curvature (K) for the design speed of the roadway by the algebraic difference in the tangent grades (A) in percent (L=K*A).
An alternative method to determining the minimum length of a sag vertical curve (L) is to multiply the rate of vertical curvature (K) for the design speed of the roadway by the algebraic difference in the tangent grades (A) in percent (L=K*A).
See lessA tape of length l and weight W kg/m is suspended at its ends with a pull of P kg, the sag correction is
Important Points Error due to Error Correction Pull +ve or -ve -ve or +ve respectively Slope Always +ve Always -ve Sagging Always +ve Always -ve
Important Points
See lessError due to Error Correction
Pull +ve or -ve -ve or +ve respectively
Slope Always +ve Always -ve
Sagging Always +ve Always -ve
In levelling operation
Explanation: Levelling operation includes, the line commences with a backsight and closes with a foresight. The first staff reading taken after setting up of instrument is always a Backsight and last staff reading taken before changing the instrument to the other position is always a Foresight.
Explanation: Levelling operation includes, the line commences with a backsight and closes with a foresight. The first staff reading taken after setting up of instrument is always a Backsight and last staff reading taken before changing the instrument to the other position is always a Foresight.
See lessCentering error of a theodolite produces an error
Explanation: The centering error of a theodolite produces an error which varies with the direction of pointing and inversely with the length of sight. Therefore, the correct answer to the student's question is (C) Which varies with the direction of pointing and inversely with the length of sight.
Explanation: The centering error of a theodolite produces an error which varies with the direction of pointing and inversely with the length of sight. Therefore, the correct answer to the student’s question is (C) Which varies with the direction of pointing and inversely with the length of sight.
See lessThe diaphragm of a stadia theodolite is fitted with two additional
The diaphragm of a stadia theodolite is fitted with two additional horizontal hairs. Stadia line or the stadia hairs is the crosshairs marked on the reticle of a theodolite. Stadia hairs are the horizontal hairs marked in the theodolite are in any other surveying instrument.
The diaphragm of a stadia theodolite is fitted with two additional horizontal hairs. Stadia line or the stadia hairs is the crosshairs marked on the reticle of a theodolite. Stadia hairs are the horizontal hairs marked in the theodolite are in any other surveying instrument.
See lessLet angular value of one graduation of a tube of length x be φ seconds and R be the radius of its internal curved surface, then
It is defined as the angular value of one division of the bubble tube. α ' = l R s i n 1 ″ seconds. where,. l = length of one division.
It is defined as the angular value of one division of the bubble tube. α ‘ = l R s i n 1 ″ seconds. where,. l = length of one division.
See lessTwo hill tops A and B 20 km apart are intervened by a third top C. If the top most contour of the three hill tops are of the same value, state whether the line of sight AB
In this scenario, since all three hilltops have the same contour value, it implies they are at the same elevation. If the line of sight AB passes clear of hilltop C, it means the line AB does not intersect the contour line of hilltop C, indicating that the line AB is at a higher elevation compared tRead more
In this scenario, since all three hilltops have the same contour value, it implies they are at the same elevation. If the line of sight AB passes clear of hilltop C, it means the line AB does not intersect the contour line of hilltop C, indicating that the line AB is at a higher elevation compared to hilltop C.
See lessTrue meridian of different places
True meridian is defined as the plane that passes through true north poles (geographical north pole) and true south poles (geographical South Pole) at the place of observation. True meridian can be established by astronomical observation as it passes through true north and south.
True meridian is defined as the plane that passes through true north poles (geographical north pole) and true south poles (geographical South Pole) at the place of observation. True meridian can be established by astronomical observation as it passes through true north and south.
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