Chain Surveying Instruments, Ranging and Offsets Surveying Unit 2 Part A | Diploma + B.Tech

Unit 2 of Surveying is Measurement of Horizontal Distance - and Part A is the instrument-and-method half. In this video we take a chain, a tape and a few steel pins, and turn a field into a drawing. The question the whole video turns on: your offset is 15 m and your DIRECTION is out by just three degrees. Where does the plotted point actually land? It slides 0.0785 cm along the chain line - and only 0.002 cm away from it. About 38 times bigger, from the same small slip. By the end you can prove that in two lines, and you will know exactly why a long offset is set out with an optical square and never by eye. SYLLABUS Diploma (WBSCTE) Semester 3, B.Tech (MAKAUT) Surveying & Geomatics, Module 1. Useful for SSC-JE, PSU, GATE CE and ESE. FREE STUDY MATERIAL Study Notes (17:06 of video, 21 pages) and a 25-question MCQ practice paper are free on Telegram. NEXT VIDEO Unit 2 Part B - systematic errors in chaining and their corrections, obstacles in chaining, and the area of a field by chain and cross-staff survey. Learn Civil Easy - powered by Abasdigi Technology Pvt. Ltd. Free for personal study. Not for resale. Learn the essentials of chain surveying to improve your plotting accuracy. This guide explains how to avoid common errors in measurement. Understanding proper surveying measurements is critical for anyone working in field engineering or site layout. This video breaks down the fundamental principles of chain surveying, specifically addressing how errors in direction can impact the precision of your plotted points. We examine the mechanics of chain length and the specific role of links in maintaining consistent data collection. Beyond basic measurements, you will learn how to handle slope measurement effectively to prevent distortion in your surveys. We also demonstrate the practical use of an optical square to establish precise right angles in the field. By mastering these techniques, you can significantly reduce errors and ensure your surveys remain reliable. Subscribe for weekly surveying technique breakdowns, and comment below with which measurement topic you want to cover next.