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1. Tacheometry

Tacheometry is a method that allows for the measurement of horizontal and vertical distances using angular observations with a tacheometer, proving to be more efficient than traditional chaining methods, especially in rough terrains. Key instruments include the tacheometer and levelling rod, while methods vary based on whether the line of sight is horizontal or inclined. Procedures for trigonometrical levelling and traverse computations are important for determining object heights and managing coordinate computations.

Sections

Tacheometry

Tacheometry facilitates quick and accurate distance measurements through angular observations using a tacheometer, especially suitable for challenging terrains.

1.19 Section Overview

Start current section content and materials

1.19.1 Instruments used

This section covers the main instruments utilized in tacheometry, focusing on the tacheometer and leveling rod.

1.19.2 Methods of tacheometry

This section highlights the different methods of tacheometry, emphasizing how horizontal distances can be determined through angular observations and staff readings.

1.20 Trigonometrical Levelling

Trigonometrical levelling is an indirect method for determining the elevation of points using vertical angles and measured distances, often used in topography.

1.20.1 Finding height of an object which is accessible

This section outlines the process to find the height of an accessible object using a theodolite.

1.20.2 Finding height of an object which is inaccessible

This section describes the methods for determining the height of an inaccessible object using trigonometric levelling techniques.

1.21 Traverse Computations

Traverse computations involve calculating the coordinates of traverse stations using field observations, critical for detailed mapping.

1.21.1 Adjustment of a closed traverse

This section discusses the necessity of adjusting observations in a closed traverse to correct errors in linear and angular measurements.

1.21.2 Computation of coordinates

This section discusses the process of computing the coordinates of traverse stations after completing field observations.

Learning Objectives

  • Tacheometry is quicker and more accurate than chaining/taping, especially in difficult terrains.

  • A tacheometer consists of a telescope with a stadia diaphragm allowing for precise distance measurements.

  • Understanding horizontal and vertical distances requires knowledge of instrument constants and careful measurements in varying terrains.

Key Concepts

Tacheometry

A surveying method to determine horizontal and vertical distances using angular measurements with a tacheometer.

Tacheometer

An instrument used in tacheometry, typically a theodolite with a specialized diaphragm for distance measurement.

Stadia Hair

Horizontal hairs in the tacheometer's telescope that help determine staff intercepts and distances.

Horizontal Distance Calculation

Computed using staff intercept readings and instrument constants.

Trigonometrical Levelling

A method for determining heights of objects using vertical angles and measured distances.

Traverse Computations

The process of calculating coordinates of traverse stations from field measurements.

Practice Exercises

Total Questions

2

Estimated Time

4 min

Passing Score

70%

Instructions

  • Read each question carefully
  • You can use hints if you need help
  • Complete all questions before submitting
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