Quick Answer: What Does It Mean When Contour Lines Are Close Together?

What shape would contour lines form over a hill or mountain?

That means that between each contour line there is a difference of 20 meters in elevation.

If you look closely at the map to your right, you will notice some dark lines with numbers on them.

These lines are called index contour lines.

Rule # 2- Contour lines form closed circles around the tops of hills and mountains..

When lines are far apart This means land is?

If the lines are far apart, that means that there is little or no slope in that area of the map. … That means it’s a steep slope. If the lines are practically touching, that means it’s a very steep slope — maybe even vertical.

How do contour lines show slope on a map?

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. Think of contour lines as the distance between each incline. The closer together the inclines, the steeper the hill.

What do contour lines indicate?

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.

How do you tell if contour lines are going up or down?

Remember contour numbering reads up hill – in other words the top of the number is uphill and the bottom is downhill. Also remember the closer contour lines are together, the steeper the slope.

What kind of slope gives you lines that are close together?

steep slope1. The spacing of contour lines shows the slope of the land. Contour lines that are close together indicate a steep slope. This is because the elevation changes quickly in a small area.

What are 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 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 you read a contour survey?

Closely spaced contour lines indicate steep slope. Widely spaced contour lines indicate gentle slope. Equally spaced contour lines indicate uniform slope. Closed contour lines with higher elevation towards the centre indicate hills.

Why do contour lines never 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.

How does the slope change as the lines get closer together?

If the lines are close together, it means that the elevation change of 10 feet happens over relatively little linear distance. The closer they are together, the steeper the slope.

How do you calculate contouring?

Divide the difference in elevation between the index lines by the number of contour lines from one index line to the next. In the example above, the distance 200 is divided by the number of lines, 5. The contour interval is equal to 200 / 5 = 40, or 40-unit contour intervals.

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.

How close the contour lines are is an indication of an area’s?

The arrangement of the contour lines on a map gives a direct indication of the changes in the field’s topography (Fig. 55). In hilly areas, the contour lines are close together while they are wider apart on flat slopes. The closer the contour lines, the steeper the slope.

What happens when contour lines are close together indicate?

Widely separated contour lines indicate a gentle slope. Contour lines that are very close together indicate a steep slope.