📌 Introduction
Surveying is one of the most fundamental subjects in Civil Engineering and a crucial part of the JKSSB JE (Junior Engineer) syllabus. Whether you’re preparing for JKSSB Civil Engineering, AE/JE exams, or other government technical posts, mastering the basics of surveying is essential.
In this post, we’ll explore:
- What is Surveying?
- Basic Principles of Surveying
- Classifications of Surveying (Based on Purpose, Instruments, and Methods)
- Important points for JKSSB Exams
📖 What is Surveying?
Surveying is the science and art of determining the relative position of points on, above, or beneath the surface of the Earth by means of direct or indirect measurements.
📝 Definition (JKSSB-friendly):
Surveying is the process of measuring distances, angles, and elevations to establish maps and plans for construction, land development, and engineering purposes.
🧱 Objectives of Surveying
- To prepare maps and plans for engineering projects.
- To determine areas, volumes, and boundaries.
- For the planning and execution of construction projects like roads, bridges, dams, buildings, etc.
🔑 Principles of Surveying
There are two basic principles of surveying that every JKSSB aspirant must remember:
1. Working from Whole to Part
✔️ “Always work from the whole to the part to avoid accumulation of errors.”
- Begin by establishing a control framework (triangulation, traverse) over the entire area.
- Then subdivide into smaller parts to conduct detailed surveys.
Importance in JKSSB Exam: This is a frequently asked MCQ topic. Be sure to remember its meaning and application.
2. Location of a Point by at Least Two Independent Measurements
- Any point must be located with reference to two known points by methods such as:
- Triangulation
- Intersection
- Resection
Example: Locating a point using angles from two known stations.
📚 Classifications of Surveying
Surveying is classified based on purpose, instrument used, and method employed.
A. Based on Purpose
| Type | Description |
|---|---|
| Geodetic Surveying | Large areas (more than 250 km²), curvature of Earth considered. Used for national mapping, satellite surveys. |
| Plane Surveying | Small areas, Earth assumed flat. Used in local civil works (roads, buildings, irrigation). |
✅ JKSSB Tip: Most questions are based on Plane Surveying.
B. Based on Instruments Used
| Type | Instrument |
|---|---|
| Chain Surveying | Chain, tape – for small, flat areas. |
| Compass Surveying | Prismatic compass – used when magnetic bearing is needed. |
| Theodolite Surveying | Theodolite – for precise angle measurement. |
| Leveling | Dumpy level, Auto level – to determine elevation differences. |
| Tachometric Surveying | Tachometer – rapid surveying, used in inaccessible terrain. |
| Total Station Surveying | Combines EDM + Theodolite + Microprocessor – accurate and digital. |
| GPS Surveying | Uses satellites – modern and efficient. |
C. Based on Method Used
| Method | Description |
|---|---|
| Triangulation | Network of triangles, used in geodetic surveying. |
| Traversing | Series of connected lines; can be open or closed. |
| Photogrammetric Surveying | Using photographs (usually aerial) to gather data. |
| Remote Sensing | Data from satellite sensors for large scale mapping. |
🧠 Tips for JKSSB Aspirants
- Focus on Plane Surveying, Leveling, Compass and Chain Surveying.
- Learn all basic definitions, principles, and classifications.
- Practice previous year question papers.
- Revise formulas for calculating area, distance, elevation etc.
✅ Conclusion
Understanding the principles and classifications of surveying is foundational for clearing JKSSB Civil Engineering exams. This topic not only helps in MCQs but also builds a strong base for other subjects like leveling, construction, and estimation.
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