---
title: "Short note: Total station principle, data recording"
subject: "Surveying II"
chapter: 9
key: "semester_4/surveying_ii:total-station-principle-data-recording"
source: https://www.bctengineer.com/q/semester_4/surveying_ii/total-station-principle-data-recording
site: BCT Engineering
---

# Short note: Total station principle, data recording

Surveying II · Chapter 9: Total Station

- Asked in: 2081 Chaitra, 4 marks
- Video: [TOTAL STATION-3: TS PRISM - ELECTRONIC DISPLAY & DATA RECORDING, RECTANGULAR & POLAR CO-ORDINATES](https://www.youtube.com/watch?v=KjF_ZfP4msc) — Civil Engineering-Endurance Engineering Academy
- Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_4/surveying_ii/total-station-principle-data-recording
- Whole chapter: https://www.bctengineer.com/md/semester_4/surveying_ii/chapter-9

## Question

Write a short note on the principle of Total station and describe the digital data recording fundamentals.

## Short answer

The total station electronically senses angles, measures slope distance by EDM phase shift, and a microprocessor calculates coordinates. Digital recording starts with job setup (station/height/atmosphere), backsight orientation, then automatically stores point number, angles, distance, and code. Data are transferred to a computer for processing, eliminating manual booking errors.

## Answer

#### Principle of a total station
A total station is an electronic theodolite with a built-in EDM and a microprocessor. The electronic circle measures the horizontal and vertical angles; the EDM sends an infrared or laser beam to a prism and calculates the slope distance from the phase shift of the returned signal. The microprocessor corrects the readings and computes horizontal distance $H = S\cos\alpha$, vertical difference $V = S\sin\alpha$ and the coordinates of the target.

#### Digital data recording fundamentals
1. **Job set-up:** a job file is created and the station name, coordinates, instrument and prism heights and the atmospheric data are entered.
2. **Orientation:** backsight is taken on a reference station to set the azimuth.
3. **Measurement:** each sighted point is stored in the memory (or card) automatically as point number, horizontal angle, vertical angle, slope distance and code (feature).
4. **Storage and transfer:** data are kept in internal memory or on a card and transferred to a computer through cable, USB or Bluetooth in standard formats.
5. **Processing:** the raw data are edited and adjusted with software, and coordinates, maps and sections are produced.

Digital recording removes manual booking errors and speeds up the survey.

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. How are the distance and coordinates obtained?
   A. The distance is read on a staff and added by hand
   B. The coordinates come from satellites
   C. The distance is taken from the tape and corrected manually
   D. EDM phase shift gives slope distance, and the microprocessor computes H = S cos α, V = S sin α and coordinates
   Answer: D. The microprocessor corrects and computes distance components and target coordinates. (Key point: Principle)

2. What is stored for each point?
   A. Point number, horizontal angle, vertical angle, slope distance and code
   B. Only the point number
   C. Only the staff reading
   D. The photograph of the point
   Answer: A. Each shot is stored automatically with point number, angles, slope distance and feature code. (Key point: Stored record)

3. What is the main benefit of digital recording?
   A. It removes the need for orientation
   B. It removes manual booking errors and speeds up the survey
   C. It eliminates all measurement errors
   D. It makes the backsight unnecessary
   Answer: B. Automatic storage avoids booking mistakes and transfers data to software. (Key point: Benefit of digital recording)

## Related in Surveying II

- [Total station features and data recording steps](https://www.bctengineer.com/question.md?key=semester_4%2Fsurveying_ii%3Atotal-station-features-data-recording) — Surveying II, chapter 9
- [Total station, features, data recording points](https://www.bctengineer.com/question.md?key=semester_4%2Fsurveying_ii%3Atotal-station-features-recording-points) — Surveying II, chapter 9
- [Total station principle, importance and uses](https://www.bctengineer.com/question.md?key=semester_4%2Fsurveying_ii%3Atotal-station-principle-importance-uses) — Surveying II, chapter 9
- [Short note: Total station features and uses](https://www.bctengineer.com/question.md?key=semester_4%2Fsurveying_ii%3Atotal-station-features-uses) — Surveying II, chapter 9, asked 18×
- [Tangential tacheometry, total station procedure](https://www.bctengineer.com/question.md?key=semester_4%2Fsurveying_ii%3Atangential-tacheometry-total-station-field-procedure) — Surveying II, chapter 2

## Related in other subjects

- [Working principle of a digital telephone exchange](https://www.bctengineer.com/question.md?key=semester_8%2Ftelecommunications%3Adigital-telephone-exchange-principle) — Telecommunications, chapter 4, asked 4×