Question: What Is A Contour Line On A Topographic Map?

What does a contour line represent on a topographic 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..

How do you determine 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 far apart are contour lines on a map?

A contour is a line drawn on a map that joins points of equal height above sea level. For 1:25 000 scale maps the interval between contours is usually 5 metres, although in mountainous regions it may be 10 metres.

What 2 types of lines show elevation differences?

Contour lines are used to show elevation on a topographic map. Lines or isolines on a map that connect points with the same elevation. What does each contour line on a map show? Each contour line shows a different elevation.

What is a contour interval on a topographic 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. … Sharp contour points indicate pointed ridges.

How do you read contour lines on a topographic 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 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 space between contour lines called?

The space between the contour lines is called the contour interval and represents a specific (set) distance. If the contour interval is 50 feet, the vertical space between the two contour lines is 50 feet.

How do you read a topographic map?

Practice reading features from a map of a familiar area. Pick out features like peaks and saddles. Identify subtler features like cliffs, which have contour lines grouped tightly together, and ridgelines, which connect peaks and have contour lines that decrease in elevation on each side.