What are the errors in total station?

Total Station Errors

• Horizontal Collimation or Line of Sight Error. Horizontal collimation or line of sight error is when the line of sight is not perpendicular to the tilting axis of the instrument.
• Tilting Axis Error or Tilt Error.
• Vertical Collimation Error or Vertical Index Error.
• Compensator Index Error.

What is the working principle of total station?

The total station consists of a built-in emitter, capable of emitting microwaves and infrared signals. The wavelength of these emitted waves helps in calculating the distance between the points. Here the distance is calculated by multiplying the time taken to cover a certain distance by the velocity.

What is backsight in total station?

Backsight Setup. In order to measure points with the total station, the instrument needs a projection model that measures the distance of points based on the angle difference of an initial reference point in an Azimuth “heading”. This is called backsight point. Backsight defines the orientation of the coordinate system …

How does a total station measure distance?

A total station consists of a theodolite with a built-in distance meter (distancer), and so it can measure angles and distances at the same time. The horizontal distance, the height difference and the coordinates are calculated automatically and all measurements and additional information can be recorded.

What is the accuracy of total station?

A typical total station can measure distances up to 1,500 meters (4,900 ft) with an accuracy of about 1.5 millimeters (0.059 in) ± 2 parts per million.

How do you check the accuracy of a total station?

Set up the total station at one end of the baseline and measure the elevation of each point. Comparing the two sets of elevations provides a check on the accuracy and adjustment of the instrument. Accuracy requirements may dictate that more than one set of angles and distances is measured to each point.

When total station is sighted to the target?

When total station is sighted to the target, which of the operation acts first? Explanation: At the time of sighting the instrument towards the target, first step involves the rotation of the instrument’s optical axis from the instrument north in horizontal plane.

Where is data stored in total station?

Which unit in total station processes data collected? Explanation: Microprocessor is the unit that processes the data collected and uses it to compute various features like horizontal and vertical distances, slopes, elevation, etc. Explanation: Total station is affixed on to the tripod.

Can total station be used for leveling?

The indirect leveling method using total station for leveling is considered to have due accuracy, applications of the indirect leveling is gradually expanding for public works such as construction of roads, airports and cities.