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Geography: Understanding Datum and Mean Sea Level

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Geography: Understanding Datum and Mean Sea Level

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Questions and Answers

What is the reference point with respect to which the levels of other points or planes are calculated?

Benchmarks

Vertical Line/Axis

Datum or datum surface (correct)

Mean Sea Level (MSL)

What is the average height of the sea for all stages of the tides?

Reduced Level (RL)

Benchmarks

Mean Sea Level (MSL) (correct)

Datum or datum surface

What is the level of a point taken as height above the datum surface?

Benchmarks

Datum or datum surface

Mean Sea Level (MSL)

Reduced Level (RL) (correct)

What is a relatively permanent reference point, the elevation of which is known with respect to Mean Sea Level (MSL)?

Benchmarks Signup and view all the answers

What is the highest precision benchmark established by a national agency in India?

GTS Benchmark Signup and view all the answers

Where is the elevation of all GTS benchmarks established with respect to Mean Sea Level (MSL) in India?

Karachi Signup and view all the answers

What is the purpose of establishing benchmarks in levelling?

To determine the difference in elevations of neighbouring points Signup and view all the answers

What is the characteristic of a temporary benchmark?

It is established at the end of the day's work Signup and view all the answers

What is the function of the level tube in a levelling instrument?

To make the line of sight horizontal Signup and view all the answers

What is the purpose of the metal shoe at the bottom of a levelling staff?

To resist wear and tear Signup and view all the answers

What is the GTS benchmark used for?

To establish a permanent benchmark with reference to mean sea level Signup and view all the answers

What does the foot of the metal shoe of a levelling staff represent?

The zero reading Signup and view all the answers

What is the primary purpose of check lines?

To measure the accuracy of main station locations Signup and view all the answers

What type of measurements are taken to locate ground features?

Offset measurements Signup and view all the answers

What is the characteristic of a base line?

It is the longest line Signup and view all the answers

What is the purpose of selecting secondary stations on main lines?

To locate interior details Signup and view all the answers

What are the two methods used for setting perpendicular offsets?

Swinging and using cross staffs Signup and view all the answers

What is the consideration for selecting station points?

It should be visible from at least two or more stations Signup and view all the answers

Geography: Understanding Datum and Mean Sea Level

Choose a study mode

Podcast

Questions and Answers

What is the reference point with respect to which the levels of other points or planes are calculated?

What is the average height of the sea for all stages of the tides?

What is the level of a point taken as height above the datum surface?

What is a relatively permanent reference point, the elevation of which is known with respect to Mean Sea Level (MSL)?

What is the highest precision benchmark established by a national agency in India?

Where is the elevation of all GTS benchmarks established with respect to Mean Sea Level (MSL) in India?

What is the purpose of establishing benchmarks in levelling?

What is the characteristic of a temporary benchmark?

What is the function of the level tube in a levelling instrument?

What is the purpose of the metal shoe at the bottom of a levelling staff?

What is the GTS benchmark used for?

What does the foot of the metal shoe of a levelling staff represent?

What is the primary purpose of check lines?

What type of measurements are taken to locate ground features?

What is the characteristic of a base line?

What is the purpose of selecting secondary stations on main lines?

What are the two methods used for setting perpendicular offsets?

What is the consideration for selecting station points?

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