# What are the 3 contour lines?

## What are the 3 contour lines?

Contour lines are of three different kinds. They are the Index lines, Intermediate lines and the Supplementary lines.

## What is a contour line on a map?

A topographic map illustrates the topography, or the shape of the land, at the surface of the Earth. The topography is represented by contour lines, which are imaginary lines. Every point on a particular contour line is at the same elevation. These lines are generally relative to mean sea level.

What is the shape of contour line?

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.

How do you get contour lines?

The two ways to establish a contour map are the cross-section method and the trace contour method. To use the cross-section method, set a control or reference line at the center of the lot, then lay out and stake a grid; the elevation is determined at each stake in the grid relative to a benchmark.

### What are the main 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.

### What’s the difference between two contour lines?

The elevation difference between two adjacent contour lines is called the contour interval (CI). Usually 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.

How do you identify a contour line?

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.

How do you read contour lines?

1. Index lines are the thickest contour lines and are usually labeled with a number at one point along the line.
2. Intermediate lines are the thinner, more common, lines between the index lines.
3. Supplementary lines appear as dotted lines, indicating flatter terrain.

#### Does Google maps show contour lines?

Google Maps now has Terrain View, which enables users to see terrain maps for an area. Topographic contour lines are overlaid on the map to show elevation levels with altitude information displayed in gray numbers.

#### What can we tell from 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 different types of contour lines?

The three types of contour lines used on a standard topographic map are index, intermediate, and supplementary. Index. Starting at zero elevation or mean sea level, every fifth contour line is a heavier line. These are known as index contour lines. Typically, each index contour line is numbered at some point.

What do contour lines represent on a map?

Put simply, contour lines mark points of equal elevation on a map. If you trace the length of a line with your finger, each point you touch is the same height above sea level. If you were to walk the path of a contour line in real life, you would remain at the same elevation the whole hike, never traveling up or down.

## What is the difference between contour and line?

As nouns the difference between contour and line is that contour is an outline, boundary or border, usually of curved shape while line is a path through two or more points ( compare ‘segment’ ); a continuous mark, including as made by a pen; any path, curved or straight or line can be (obsolete) flax; linen, particularly the longer fiber of flax.