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Fundamental Principles of Land Surveying: Classification and Types

Fundamental Principles of Land Surveying: Classification and Types

Hello friends! Obtaining accurate results in the world of surveying is an art. In today's article, we will discuss the fundamental principles and classifications that serve as the 'Bible' for every surveyor.

survey engineer with total station by nts study

Fundamental Principles of Surveying

To achieve accurate results and minimize errors, it is mandatory to follow two core principles:

(i) Working from Whole to Part

In this method, high-precision primary control points are first established for the entire area. Subsequently, secondary control points are identified, and finally, local details are plotted.

Benefit: This principle helps in localizing errors. If we perform a survey by adding small parts to create a whole, errors tend to accumulate, which can lead to unacceptable inaccuracies in the final result.

(ii) Locating New Points

To establish any new station ( $C$ ), it is essential to take independent measurements from at least two known reference points ( $A$ and $B$ ). Check lines and tie lines are utilized for this purpose to ensure the accuracy of the location.

Detailed Classification of Surveying

Surveying is primarily classified based on four criteria:

(A) Based on the Nature of the Field

Land Survey: Includes Topographical (natural features), Cadastral (property boundaries), and City surveys.
Hydrographic Survey: Determining the depth of water bodies (Sounding) and identifying marine routes.
Astronomical Survey: Determining the position of points on Earth by observing the Sun and stars.

(B) Based on the Purpose of the Survey

This category is crucial for engineering students:

Engineering Survey: Subdivided into Reconnaissance, Preliminary, and Location surveys.
Specialized Surveys: Includes Military, Mine, Geological, and Archaeological surveys for specific strategic or exploration purposes.

(C) Based on Instruments Used

Students are generally taught based on this classification:

Chain Surveying
Compass Surveying
Plane Table Surveying
Theodolite Surveying
Modern Instruments: Total Station and GPS.

(D) Based on Methods Employed

Triangulation: Utilizing a network of triangles to cover the area.
Traversing: Establishing a series of connected lines. This is further divided into Closed Traverse and Open Traverse.

NTS Study Note: This post is highly beneficial for students preparing for SSC JE or GATE exams.

🏗️ Surveying: Complete Study Guide & Index

📔 Part 1: Fundamentals of Surveying

Surveying: A Bird's Eye View – Meaning and significance of land surveying.
Fundamental Principles – Classification and types of surveying.
Primary Division – Understanding Plane vs. Geodetic Surveying.
Representative Fraction (RF) – Utilization of scales and reduction factors.

📏 Part 2: Linear Measurement & Chain Survey

Chain Surveying – Basic procedures and workflow.
Errors & Adjustments in Chaining – Deficiencies in measurement and their remedies.
Distance Measurement Methods – Detailed discussion on linear surveying tools.
Tape Corrections – Adjustments for Sag, Temperature, and Pull.

🧭 Part 3: Angular & Instrumental Survey

Compass Surveying – Magnetic bearing survey and its applications.
Plane Table Surveying – Equipment used and graphical methods.
Theodolite Surveying – Horizontal and vertical angle measurement.
Total Station – Components, features, and modern digital use.

🏔️ Part 4: Levelling & Elevation

Need for Levelling – Why vertical measurement is vital in civil engineering.
Key Concepts: RL & Datum – Definitions of Reduced Level, Datum, and Benchmarks.
Operating Levelling Instruments – Handling Auto Level and Tilting Level.

🛰️ Part 5: Modern Technologies

Remote Sensing – Information on INSAT and IRS Series satellites.
GIS & LIS Systems – Geographic data management and functionality.
Laser Scanning – Advanced application and control.
Geoid & Ellipsoid – Understanding the mathematical shape of the Earth.

📝 Part 6: Practice & Quizzes (MCQs)

Surveying Quiz 1 (01-25) – GPS, Remote Sensing, and Photogrammetry.
Surveying Quiz 2 (26-50) – Ranging, EDM, and Tacheometry.
Surveying Quiz 3 (51-75) – Contouring and HI Method Levelling.
Surveying Quiz 4 (76-100) – Transition Curves and Bowditch Rule.
Surveying Quiz 5 (101-125) – Plane table and Compass
Surveying Quiz 6 (125-150) – Theodolite Surveying and Levelling
Surveying Quiz 7 (151-175) – Tacheometry, Curves, Modern Surveying Instruments (EDM/GPS)
Surveying Quiz 8 (175-200) – Area & Volume Calculation, Minor Instruments

📚 Quick Revision Resources

Surveying IS Codes with Latest Revision Years

1. General Surveying & Instruments

IS 1491:1959 – Specification for Prismatic Compass (Liquid and Non-liquid).
IS 1963:1981 – Specification for Bubbles for Surveying Instruments.
IS 2988:1995 – Glossary of Terms Relating to Surveying Instruments.
IS 1634:1992 – Code of Practice for Design and Construction of Storage for Surveying Instruments.

2. Chain and Tape Surveying

IS 1492:1970 – Specification for Metric Surveying Chains.
IS 1269 (Part 1):1997 – Material and Construction of Steel Tapes.
IS 1269 (Part 2):1997 – Woven Metallic and Glass Fibre Tapes.
IS 1659:2006 – Specification for Invar Tapes for High Precision Measurement.

3. Theodolite and Tacheometry

IS 8002:1976 – Specification for Surveying Chain Vertical Vernier Theodolite.
IS 8330:1976 – Specification for Tilting Levels (Optical).
IS 8636:1977 – Specification for Tacheometers.

4. Leveling and Contouring

IS 9128:1992 – Specification for Tilting Levels.
IS 9573:1980 – Specification for Automatic Levels.
IS 1779:1961 – Specification for 4-metre Leveling Staff (Folding Type).

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