Question: What Is Every Fifth Contour Line Called?

What is meant by contour line?

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.

map: contour lines.

The diagram illustrates how contour lines show relief by joining points of equal elevation..

What are contour lines in art?

A contour line defines the outline of a form, as well as interior structure, without the use of shading. A fundamental basis of drawing, contour lines are usually the first technique children adopt to draw people, houses, and trees.

What does a V shaped contour line mean?

Rule # 4- Contour lines that cross a valley or stream are V-shaped. Contour lines “point” upstream when they cross a river or stream. … The V points toward the area of higher elevation. Notice how the contour lines bend uphill where the river crosses them.

Can contour lines cross?

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.

How do you find the contour interval?

Start with the next line of the index line, Counting each contour line up to and including the next index line. To find the elevation interval between the contour lines, Divide the difference in elevation between the index lines by the number of contour lines from one index line to the next.

How do you read a topographic map?

How to Read a Topographic MapEvery point of the same contour line has the same elevation.One side of a contour line is uphill and one is downhill.Contour lines close to form a circle (or run off the side of the map). … Contour lines are drawn close together on steep ground and farther apart on flat ground.

What is every 5th contour line called?

index contour linesUsually the contour interval is noted on the map legend. In most topographic maps every 5th contour line is drawn in bold print or wider than other contours. Such lines are called index contour lines. They are usually labeled with their corresponding elevations.

What is another name for a contour line?

Also called contour, level curve, level line.

What are the different 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…

What are the basic features of contour lines?

Other characteristics of contour lines are: – Horizontal distance between contour lines is inversely proportional to slope. – Uniform slopes have uniformly spaced lines. – Along plane surfaces, contour lines are straight and parallel. – Contour lines are perpendicular to lines of steepest slopes.

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 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.

What is the rule of V?

The Rule of V’s: When a bed crosses a valley, the outcrop pattern of the bed will ‘V’ or curve in the direction that the bed is dipping in map view. Conversely, when a sedimentary bed crosses a ridge, it will ‘V’ in the direction opposite to its dip. … A horizontal bed will parallel topographic contours on a map.