Datum, Reduce Level, Mean Sea Level || ENGINEERING SURVEY || Bangla ||Civil Engineering

Datums are used as the starting reference point for surveying jobs and put your work in a larger context. While a datum can be any reference used to measure an object — including planes, lines and points — in surveying they are typically points, called geodetic datums. Reduced level (RL): this is the height or elevation above the point adopted as the site datum for the purpose of establishing levels. Mean sea level (MSL) is an average level of the surface of various oceans from which heights such as elevations may be measured. Note: Mean Sea Level (MSL) adopted by a survey of India for reference is located at Mumbai High. India's mean elevation is 160 m (525 ft) and is taken from Mumbai High. Connect with us: Subscribe to us on YouTube Join our Telegram Group - https://t.me/joinchat/NHAf5LjfH1pjZTJl