What is the value of additive constant in?

8. What is the value of additive constant in anallactic lens? Explanation: If the anallactic lens has been provided in the internal focussing telescope, the additive constant can be reduced to minimal value i.e., zero due to which the computations can be make quicker.

What Tacheometric constant?

Determination of Tacheometric Constants. The stadia interval factor (K) and the stadia constant (C) are known as tacheometric constants. Before using a tacheometer for surveying work, it is reqired to determine these constants. These can be computed from field observation by adopting following procedure.

What is multiplying constant?

The constant, used in stadia work, by which the staff intercept is multiplied to determine the distance between the staff and the theodolite. The value is generally taken as 100.

What is the use of tacheometer?

A tachymeter or tacheometer is a type of theodolite used for rapid measurements and determines, electronically or electro-optically, the distance to target.

Which is characteristic of tacheometer?

The essential characteristics of a tacheometer are: (a) The value of the multiplying constant f/i should be 100. (b) The telescope should be powerful having magnification20 to 30 diameters. (c) The aperture of the objective should be large about 4 cm in diagram in order to have a sufficiently bright image.

What is EDM in survey?

Electronic distance measurement (EDM) is a method of determining the length between two points using electromagnetic waves. … EDM instruments are highly reliable and convenient pieces of surveying equipment and can be used to measure distances of up to 100 kilometers.

How do you solve constant stadia?

What is stadia constant in surveying?

The distance C is called the stadia constant. Equation (23.2) is known as the stadia equation for a line of sight perpendicular to the staff intercept. Theory of Stadia Tacheometry. The following is the notation used in stadia tacheometry. O.

Read More:  Why is the proofreading site in aminoacyl-tRNA reaction so important?

What is the value of additive constant in analytic?

zero If a tachometer is fitted with an anallatic lens, its additive constant is zero and the multiplicative constant is 100.

How do you find the multiplication constant?

The multiplying constant in the distance formula by tacheometry is given by

  1. focal length of the objective lens divided by the distance between the stadia wires.
  2. focal length of the objective lens multiplied by the distance between the stadia wires.
  3. stadia intercept divided by the focal length of the objective lens.

Which of the below is not a classification of surveying?

5. Which of the below is not a classification of surveying? Explanation: Based on place of survey, the classification includes land, marine and astronomical categories. Basement refers to underground, no survey is performed there.

What is the method of Tacheometric survey?

Tacheometric surveying is a method of angular surveying in which the horizontal distance from the instrument to the staff stations are determined from instrumental observations only. Thus the chaining operations are eliminated.

What is Tacheometric principle?

Principle of tacheometry: The principle of tacheometer is based on property of isosceles triangles, where the ratio of distance of the base from apex and length of the base is always constant.

What is the principle of Tacheometry?

The principle of tacheometric surveying is based on the property of an isosceles triangle. It means that; the ratio of the distance of the base from the apex and the length of the base is always constant.

What should be the aperture required for Tacheometer?

9. What should be the aperture required for tacheometer? Explanation: The magnification of the telescope in tacheometer should be at least 20 to 30 diameters, with an aperture of at least 40 mm for a sufficiently bright image.

Read More:  What is Anagenetic speciation?

What are the different systems of Tacheometric measurements?

Different Methods of Tacheometric Measurements

  • The Stadia System. Fixed Hair Method. Movable Hair Method, or Subtense Method.
  • The Tangential System.
  • Measurements by means of Special Instruments.

How do you calculate Tacheometry?

What is electromagnetic distance meter?

An Electronic Distance Measurer (EDM) can be used to place objects or points in three dimensions in relation to the unit. The EDM emits a beam of infrared light that is modulated at a controlled rate. … Additionally, the EDM also measures the azimuth, or angle from north, and elevation of a point.

How does EDM measure distance?

To measure the horizontal distance between two points, one surveyor uses an EDM instrument to shoot an energy wave toward a reflector held by the second surveyor. The EDM records the elapsed time between the wave’s emission and its return from the reflector.

What is ppm in total station?

More accurate and less time consuming than traditional methods, GPS surveying encounters fewer distractions that can delay a development project, such as poor weather. The acronym PPM, standing for parts per million, expresses the accuracy of a relative orthometric height used in GPS-aided ground leveling.

What is the precision of stadia?

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 is a stadia intercept?

a method of surveying in which distances are read by noting the interval on a graduated rod intercepted by two parallel cross hairs (stadia hairs, or stadia wires ) mounted in the telescope of a surveying instrument, the rod being placed at one end of the distance to be measured and the surveying instrument at the …

Read More:  What is bicycle ergometer test?

How do you read stadia lines?

What mean stadia hairs?

: horizontal cross hairs (as in a theodolite) equidistant from the central horizontal cross hair.

Which lens is used in tachometer?

Untitled Document. It is a special convex lens, fitted in between the object glass and eyepiece, at a fixed distance from the object glass, inside the telescope of a tacheometer. The function of the anallactic lens is to reduce the stadia constant to zero.

Which is the latest development in total station?

Which is the latest development in a total station? Explanation: Nowadays, robotic total stations are available. They can be operated from a distance via remote control. It eliminates the need for an assistant staff man.

What is Cross staff used for?

The cross-staff was a navigational tool used to measure the angle between the horizon and a celestial body such as the sun or stars. By knowing this angle, a navigator could then determine his latitude and direction. The cross-staff is also referred to as the fore-staff and the Jacob’s staff.