Contour Maps: Methods and Applications

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What are depression contours used to show on a map?

Flat terrains

High spots such as mountains

Low spots such as excavations (correct)

Forested areas

Why are supplemental or auxiliary contours used in mapping?

To better depict relief in flat areas (correct)

To represent forested regions

To show areas with steep slopes

To indicate high elevations

What is the purpose of interpolation when drawing contour lines?

To calculate the area of the map

To connect measured points of elevation (correct)

To determine the color code for elevations

To plot trees and vegetation

Which method is NOT commonly used in plotting contours?

Coloring Signup and view all the answers

When station elevations do not align with desired contour elevations, what technique is needed?

Interpolation Signup and view all the answers

What do approximate contours represent on a topographic map?

Rough estimations of elevation changes Signup and view all the answers

What is the main purpose of contour maps in the context of civil engineering?

To identify the most economical and suitable sites Signup and view all the answers

How does slope relate to the ground surface?

It defines the rate of rise and fall of the ground surface Signup and view all the answers

In what ways can slope be expressed?

Percent, degrees, gradient, mils, grads Signup and view all the answers

What can be inferred from contour lines on a topographic map?

Slope between two points Signup and view all the answers

Which of the following is NOT an application/use of contour maps?

Determining the quality of materials in construction Signup and view all the answers

What is the significance of marking alignments of roads and railways on contour maps?

To minimize earthwork required in cutting and filling Signup and view all the answers

What is the main purpose of using subaqueous contours in mapping?

To show the depth of underwater areas Signup and view all the answers

What does a contour line represent on the ground surface?

Points with the same elevation Signup and view all the answers

What does it mean if a contour on a map closes within the map limits?

It signifies a summit or a depression Signup and view all the answers

What is the contour interval related to?

The difference in elevation between two contour lines Signup and view all the answers

In mapping, what does a darker tint usually signify when used to represent underwater areas?

Deeper regions Signup and view all the answers

How do contour lines help in representing relief on a two-dimensional map?

By showing points with the same elevation Signup and view all the answers