Quick Answer: How Do You Determine The Contour Interval?

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 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…

Which information does a thicker contour line provide?

When contour lines are close together on a map, it shows a steeper slope of the terrain. In contrast, when contour lines are far apart, it shows a flatter terrain. The thicker, sometimes darker-brown, contour lines with an elevation number denoted are called index contours.

What is the contour interval of the map quizlet?

A contour line on a topographic map connects points of equal elevation. The change in elevation from contour line to contour line is called the contour interval. such as 1,600 or 2,000 feet.

What does the contour interval 40 feet refer to?

A map’s contour interval is the difference in elevation between two adjacent contour lines (usually 40 feet on 7.5-minute maps and 80 feet on 15-minute maps). Every fifth contour line is printed darker than other lines and is labeled periodically with elevation.

How far apart are contour lines?

Contour height The vertical interval is the height (elevation) between each contour and they appear 5 or 10 metres apart with thicker lines every 50 metres.

What can contour lines never do?

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. … The only time two contour lines may merge is if there is a vertical cliff (see figure). Moving from one contour line to another always indicates a change in elevation.

What color is normally used to indicate contour lines on a topographical map?

brownThe colors of the lines usually indicate similar classes of information: topographic contours (brown); lakes, streams, irrigation ditches, and other hydrographic features (blue); land grids and important roads (red); and other roads and trails, railroads, boundaries, and other cultural features (black).

What does a Cirque look like on a topographic map?

Cirques are marked on topographic maps by the arcuate contours that define the steep sides of the “bowl”, with the flatter bottom of the “bowl” sometimes marked with closed hachured contours. The bottom of the cirque is often filled by water to form a lake.

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.

How are streams indicated on a topographic map?

Where a stream crosses the land, the Vs in the contour lines point uphill. The channel of the stream passes through the point of the V and the open end of the V represents the downstream portion. If the stream contains water, the line will be blue; otherwise, the V patterns indicate the direction water will flow.

What is the contour interval of the map?

A contour line is a line drawn on a topographic map to indicate ground elevation or depression. 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.

What exactly does a contour line show?

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.

Which information does a thicker contour line provide quizlet?

A darker, heavier contour line that is labeled with an elevation. It is usually every fifth line that indicates a change in elevation.

How does the spacing of the contour lines show the difference between gentle and steep slopes?

2. Closely spaced contour lines represent steep slopes, conversely, contour lines that are spaced far apart represent gentle slopes. 3. Contour lines trend up valleys and form a “V” or a “U” where they cross a stream.