What Are Contour Lines In Geography?

How do we use contour lines?

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.

They’re useful because they illustrate the shape of the land surface — its topography — on the map..

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…

What is the shape of contour lines?

The less separation between contour lines means a steeper slope and vice versa. When there are evenly spaced contours, the slope is uniform. At a stream junction, contour lines form a “M” or “W” shape. This can be interpreted as two “V-shaped contours intersecting.

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 do concentric contour lines indicate?

Concentric circles of contour lines indicate a hilltop; concentric circles with hachure marks indicate a close depression (Figure 7.6).

What contour means?

1 : an outline especially of a curving or irregular figure : shape the sleek contours of the car The map shows the contour of the coastline. also : the line representing this outline. 2 : the general form or structure of something : characteristic —often used in pluralthe contours of a melody…

How do you label contour lines on a topographic map?

A map with contour lines on it is called a topographic map. To add single contour labels click annotate tab labels tables panel add labels menu surface contour single. The change in elevation from one contour line to the next is always the same within the same mapmany maps have either a 40 or 80 foot contour interval.

What do close contour lines indicate?

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 are contours geography?

Definition: Contours are a collection of lines found on maps that show mountains, valleys and landforms. Contours are measured from sea level. … Contours can be used to understand the map and to know where land will be steep or flat.

Why are contour lines used?

In cartography, a contour line (often just called a “contour”) joins points of equal elevation (height) above a given level, such as mean sea level. A contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

What are the features of contour lines?

Characteristics of ContoursMust close on themselves, on or off the map.Perpendicular to the direction of max. … Slope between them is assumed uniform.The distance between them indicates the steepness of the slope, gentle or steep.Irregular signify rough, smooth signify gradual slopes.Concentric closed contours: hills or depression.More items…

Can contour lines cross?

Contour lines never cross. They may come very close to each other (e.g. along a cliff), but by definition they may never cross each other. * This is because one location on the surface of Earth cannot be at two different elevations!