📚 CTEVT | Control Survey – Chapter 2: Traverse Survey
(Full Notes + Practice Questions + Free PDF)
Traverse Surveying is one of the most important techniques in Control Survey (EG 2102 GE).
Chapter 2 focuses on establishing horizontal control points by measuring distances and angles between a series of connected stations.
Traversing is widely used in:
🏗️ Engineering construction projects
🛣️ Road and railway alignment
🗺️ Boundary and cadastral surveys
🌍 Geodetic control densification
This chapter explains the full concept of traverse, its classification, field procedures, computations, and adjustment of errors.
🧩 Chapter Overview: Traverse Survey
Traverse Survey = A method of surveying in which a series of connected lines are measured, and their directions and lengths are used to establish horizontal control.
Chapter 2 helps students understand:
✔️ Introduction and principles of traversing
✔️ Types and classification of traverses
✔️ Field procedures: reconnaissance, monumentation, signaling
✔️ Angle and distance measurement techniques
✔️ Computation, plotting, and adjustment
✔️ Errors in traverse and correction methods (Bowditch, Transit etc.)
This chapter is essential before moving into:
📌 Triangulation
📌 Trilateration
📌 Resection & Intersection
📥 Download the Full Chapter 2 Notes
🎥 Watch the Chapter 2 Video on YouTube
👉 [Click Here to Watch Chapter 2 on YouTube]
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🔍 2.1 Introduction to Traverse
A traverse is a series of survey lines connecting points called traverse stations.
⭐ Definition
Traverse surveying is the process of establishing control points by measuring:
📌 Length of traverse lines
📌 Angles or bearings between them
Traversing provides a framework for detailed surveying and mapping.
🔍 2.1.2 Important Terms in Traversing
Understanding key terms is crucial for exams:
-
Traverse Station: Fixed point where lines meet
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Traverse Line: Line joining two consecutive stations
-
Bearing: Direction of a line with respect to meridian
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Included Angle: Angle between two adjacent traverse lines
-
Azimuth: Horizontal angle measured clockwise from north
-
Closing Error: Difference between computed and true closing point
🔍 2.1.3 Principles of Traversing
Traversing is based on two fundamental principles:
✅ Principle 1: Working from Whole to Part
First establish accurate control, then fill in details.
✅ Principle 2: Fixing Points by Two Independent Measurements
Each station should be fixed by:
✔️ Distance measurement
✔️ Angle/bearing measurement
This ensures accuracy and reliability.
🔍 2.1.4 Classification of Traverse and Uses
Traverses are classified based on shape and purpose:
📌 Open Traverse
A traverse that does not return to the starting point.
Used in:
🛣️ Road alignment
🚂 Railway surveys
⛏️ Pipeline projects
⚠️ Less accurate because closure is not checked.
📌 Closed Traverse
A traverse that forms a closed loop or ends at a known point.
Used in:
🏙️ Property boundary surveys
🗺️ Control networks
📍 Mapping projects
✔️ More accurate because errors can be adjusted.
🔍 2.1.5 Standards and Specifications
Traverse surveys must follow standard accuracy requirements depending on project type:
✔️ Engineering traverse
✔️ Cadastral traverse
✔️ Geodetic traverse
Higher order traverse requires:
📌 Precise instruments
📌 Shorter permissible errors
📌 Proper adjustment methods
🔍 2.2 Methods of Traversing
Traversing methods depend on instruments used:
✅ 2.2.1 Chain, Compass, and Plane Table Traverse
Chain Traverse
-
Distances measured with chain/tape
-
Suitable for small, simple surveys
Compass Traverse
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Bearings measured with compass
-
Used for preliminary surveys
Plane Table Traverse
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Plotting done directly in field
-
Useful for rapid mapping
✅ 2.2.2 Stadia Traverse and Theodolite Traverse
Stadia Traverse
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Distance measured optically using stadia hairs
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Faster than chaining
Theodolite Traverse
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Most common and accurate method
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Angles measured precisely
-
Used for control establishment
Modern surveys often use:
✅ Total Station Traverse
✅ GNSS-supported traverse
✅ 2.2.3 Traverse Routes: Open and Closed
Traverse routes are:
✔️ Open route (not closing)
✔️ Closed loop route
✔️ Closed link traverse (between known points)
Closed traverses are preferred due to error checking.
🔍 2.3 Field Procedure in Traverse Survey
Traverse survey involves systematic steps:
🔍 2.3.1 Field Operations
1. Reconnaissance
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Study area and select traverse route
-
Ensure intervisibility between stations
2. Monumentation and Signaling
Stations are marked permanently using:
✔️ Concrete pillars
✔️ Pegs
✔️ Nails
✔️ Reference marks
Signals are placed for visibility.
3. Selection of Traverse Stations
Stations should be:
✔️ Easily accessible
✔️ Stable ground
✔️ Clear line of sight
✔️ Suitable for future use
4. Traverse Sketch and D-Cards
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Traverse chart/sketch prepared
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Station details recorded in D-cards
🔍 2.3.2 Angle Measurement
Angles measured include:
✔️ Horizontal angles
✔️ Zenith/Vertical angles
✔️ Bearings
Angle observations must be repeated for accuracy.
🔍 2.3.3 Distance Measurement
Distances are measured using:
✔️ Tape
✔️ Subtense bar
✔️ Stadia method
✔️ EDM (Electronic Distance Measurement)
Modern projects mostly use total station EDM.
🔍 2.3.4 Field Precautions
✔️ Centering and leveling must be perfect
✔️ Angles measured repeatedly
✔️ Distances corrected for slope and temperature
✔️ Avoid long traverse legs
✔️ Keep proper field booking
🔍 2.3.5 Recording, Computation and Plotting
Traverse computations include:
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Bearing calculations
-
Latitude and departure
-
Closing error determination
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Plotting traverse network
🔍 2.4 Errors and Adjustment in Traverse
Traverse surveys always contain errors which must be adjusted.
🔍 2.4.1 Types of Errors
✔️ Instrumental errors
✔️ Personal errors
✔️ Natural errors
✔️ Mistakes (gross errors)
🔍 2.4.2 Sources of Errors
Angle Errors:
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Improper centering
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Poor observation
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Incorrect reading
Distance Errors:
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Tape sag
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Temperature variation
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Incorrect slope correction
🔍 2.4.3 Traverse Adjustment Methods
When traverse misclosure occurs, corrections are applied.
✅ Bowditch Rule (Compass Rule)
Corrections proportional to line length.
Most commonly used in engineering surveys.
✅ Transit Rule
Corrections proportional to latitude/departure.
✅ Graphical Method
Errors adjusted by plotting corrections graphically.
✅ Axis Rule
Used for special traverse networks.
Adjustment ensures closure and accuracy.
🧪 Practical Insights for Students (Chapter 2)
By learning traverse surveying, students gain:
✔️ Ability to establish horizontal control networks
✔️ Skills in theodolite/total station operation
✔️ Knowledge of traverse adjustment methods
✔️ Strong foundation for triangulation and geodetic surveys
📝 Short Questions
1️⃣ Define traverse surveying.
2️⃣ What is a traverse station?
3️⃣ Differentiate open and closed traverse.
4️⃣ What is closing error?
5️⃣ Name two methods of distance measurement in traverse.
6️⃣ What is Bowditch rule used for?
7️⃣ Why is reconnaissance important?
8️⃣ Mention any two sources of traverse error.
📝 Long Questions
1️⃣ Explain the principles and classification of traverse survey.
2️⃣ Describe field procedures for theodolite traverse survey.
3️⃣ Discuss types, sources, and adjustment of errors in traverse.
4️⃣ Explain Bowditch rule and Transit rule with their applications.
5️⃣ Write detailed notes on distance and angle measurement in traverse.
🎯 Key Takeaways
✔️ Traverse survey establishes horizontal control points.
✔️ Closed traverse is more accurate than open traverse.
✔️ Distances and angles are the foundation of traversing.
✔️ Errors must be adjusted using Bowditch or Transit rule.
✔️ Traversing is essential in engineering and cadastral projects.
📂 Download Free PDF Notes – Chapter 2: Traverse Survey
🔽 [Download Notes – Chapter 2 (PDF)]
🎥 Watch the Full Chapter 2 Video
👉 [Click Here to Watch on YouTube]
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📂 Download Control Survey PDF
📘 SYLLABUS – Download PDF
📘 Unit 1: Levelling – Download PDF
📘 Unit 2: Traverse – Download PDF
📘 Unit 3: Triangulation – Download PDF
📘 Unit 4: Trilateration – Download PDF
📘 Unit 5: Resection & Intersection – Download PDF
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