What Does It Mean When Contour Lines Are Far Apart?

What do widely spaced contour lines indicate?

Widely spaced contour lines indicate a gentle slope (Figure F-2).

3.

Evenly spaced contour lines indicate a uniform slope (Figure F-2), while irregular spacing indicates an irregular slope (Figure F-1)..

What is a depression contour line?

A closed contour, inside of which the ground or geologic structure is at a lower elevation than that outside, and distinguished on a map from other contour lines by hachures marked on the downslope or downdip side.

Can a contour line split?

Contour lines never split or divide.

What are the 5 Rules of contour lines?

Rule 1 – every point of a contour line has the same elevation. Rule 2 – contour lines separate uphill from downhill. Rule 3 – contour lines do not touch or cross each other except at a cliff. Rule 4 – every 5th contour line is darker in color.

How do contour lines work?

Contour lines are lines drawn on a map connecting points of equal elevation, meaning if you physically followed a contour line, elevation would remain constant. Contour lines show elevation and the shape of the terrain. … In order to keep things simple, topographic maps show lines for certain elevations only.

What is the difference between the contour lines of a hill and the contour lines of a depression in the earth’s surface?

1 Answer. Contour lines are used in a map to portray differences in elevation. When contour lines are closer together on a map, they indicate a steep slope. … On the other hand, the farther apart lines tend to indicate a depression in the landscape.

What is the distance between contour lines called?

The space between the contour lines is called the contour interval and represents a specific (set) distance. If the contour interval is 50 feet, the vertical space between the two contour lines is 50 feet.

What exactly does a contour line show?

Contour line, a line on a map representing an imaginary line on the land surface, all points of which are at the same elevation above a datum plane, usually mean sea level. The diagram illustrates how contour lines show relief by joining points of equal elevation.

What is the importance of contour lines?

The purpose of contour lines is to represent the tridimensional shape of the terrestrial surface on a bidimensional map. Contour lines are the intersection of an horizontal plane parallel to the reference level and the topographical surface to describe. Consequently: Contour lines are always closed curves.

Can contour lines intersect?

Contour lines can never cross one another. Each line represents a separate elevation, and you can’t have two different elevations at the same point.

What is meant by contour interval?

A contour interval is the vertical distance or difference in elevation between contour lines. Index contours are bold or thicker lines that appear at every fifth contour line. If the numbers associated with specific contour lines are increasing, the elevation of the terrain is also increasing.

What does it mean when contour lines are close together?

Contour lines that are relatively close together indicate a slope that is fairly steep. Contour lines that are further apart indicates a slope that is relatively flat. The area of the map above boxed in orange shows an area that has a fairly steep slope, while the area boxed in purple is a relatively flat area.

What do we call when contour lines are closer to each other?

When contour lines are closer to each other, then slope is called steep slope. When contour lines are further apart from each other, then slope is gentle slope.

What are the 3 types of contour lines?

There are 3 kinds of contour lines you’ll see on a map: intermediate, index, and supplementary.Index lines are the thickest contour lines and are usually labeled with a number at one point along the line. … Intermediate lines are the thinner, more common, lines between the index lines.More items…

Can a contour line branch into different directions?

A contour line should not fork or divide. Contours cannot branch or wye into two contours of the same elevation. Controlling features in locating contours are usually drainage lines. Contour lines crossing a stream point upstream and form form V’s.