Traverse: Calculate Interior Angles with CE 404 Surveying Quiz and Flashcards

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Questions and Answers

What is the direction of measuring angles in the usual practice?

Both clockwise and counterclockwise

From south only

Counterclockwise

Clockwise (correct)

What is the formula to calculate the sum of interior angles of a closed traverse?

n - 2 × 180° (correct)

n / 2 × 180°

n × 180°

n + 2 × 180°

What is the purpose of measuring azimuth angles in surveying?

To measure the interior angles of a closed traverse

To determine the directions of several lines quickly (correct)

To determine the bearing of a line

To measure the exterior angles of an open traverse

What is the definition of an interior angle in surveying?

An angle enclosed by the sides of a closed traverse Signup and view all the answers

What is the method used to determine the bearing of each line if the bearing of one line is known?

Azimuth traverse Signup and view all the answers

How many angles or directions can be determined at one setup of the transit or theodolite in azimuth traverse?

Several Signup and view all the answers

What is a traverse in surveying?

A method of measuring the distance and angles between points found in the boundary of a site Signup and view all the answers

What type of traverse is used extensively in control, construction, property, and topographic surveys?

Closed traverse Signup and view all the answers

What is a common type of error in angle measurement?

Personal errors Signup and view all the answers

What is the range of variation for bearings in calculating closed traverse?

0 to 90 degrees Signup and view all the answers

What is an azimuth typically measured from in surveying?

North and south Signup and view all the answers

What type of traverse is recommended to avoid due to lack of observational checks?

Open traverse Signup and view all the answers

What does DEPARTURE in ENGR.GABA refer to?

The projection on the east-west line Signup and view all the answers

What is the reason for the length and departure being zero for a closed traverse?

The traverse forms a closed polygon Signup and view all the answers

What is the correct relative direction of the bearing between courses 3-4 and 4-5?

West Signup and view all the answers

What is the approximate total bearing change between courses 1-2 and 2-3?

28° Signup and view all the answers

What is the approximate length of course 1-2?

38.40 km Signup and view all the answers

What is the relative bearing of course 4-5 compared to course 3-4?

West Signup and view all the answers

Study Notes

Traverse Surveying

A traverse is a series of consecutive lines whose ends have been marked in the field and whose lengths and directions have been determined from observations.

Types of Traverses

Closed Traverse: Provides checks on the observed angles and distances, which is an extremely important consideration. Used extensively in control, construction, property, and topographic surveys.
Open Traverse: Consists of a series of lines that are connected but do not return to the starting point or close upon a point of equal or greater order accuracy. Should be avoided because they offer no means of checking for observational errors and mistakes.

Errors in Angle Measurement

Personal Errors: Instrument not centered over point, pointing errors, unequal settling of tripod, improper focusing of telescope, instrument not level, and placement and plumbing of rod.

Calculating Closed Traverse Bearings and Azimuths

Bearings: Vary from 0 to 90 degrees, require two letters and a numerical value, and are measured clockwise and counterclockwise from north and south.
Azimuths: Vary from 0 to 360 degrees, require only a numerical value, and are measured clockwise only from north or south.

Interior Angle Traverse

Used principally in land surveying, the usual practice of measuring angles is in a clockwise direction. Interior Angle – angle enclosed by the sides of a closed traverse.

Sample Problems

Sample problem: Determine the interior angle at C in a five-sided closed traverse.
Sample problem: Determine the bearing of each line if the bearing of line AB is N 15°30’ E.
Sample problem: Determine the bearing and azimuth from north of all traverse lines.
Sample problem: Calculate latitude and departure for a closed traverse.

Latitude and Departure

Latitude: The projection on the north-south meridian. Northern Latitude is positive, while Southern Latitude is negative.
Departure: The projection on the east-west line. Eastern Departure is positive, while Western Departure is negative.
For a closed traverse, ΣLatitude = 0 and ΣDeparture = 0.

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Description

Test your knowledge of Traverse Surveying, a method of surveying that involves measuring distances and angles between points in a site's boundary. Learn about the different types of traverses and how they are used in surveying.

CE 404: Fundamentals of Surveying - Traverse

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