Quick Answer: How To Draw Contour Lines?


What are the 5 Rules of contour lines?

General Rules for Contour Lines
1. Contour lines connect points of equal elevation; therefore every point along a contour line is the exact same elevation.
3. Contour lines never split or divide.
4. Contour lines always separate points of higher elevation (uphill) from lower elevation (downhill).


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.

Why can’t contour lines cross?

Contour lines never cross on a topographic map because each line represents the same elevation level of the land.

Can contour lines touch?

When the terrain is an overhang or cliff, contour lines will cross or touch. When you generate 100-meter contours, they are very close to converging. In 3D, you can see how steep these cliffs are. So if these contours did cross, it’s very likely an overhang.

What is the difference between two contour?

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.

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Does Google Earth show contour lines?

Open Google Earth. Click File | Open, select the KML file, and click Open. The contour map is loaded and displayed over the aerial photo. The color and transparency properties are retained.

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.

Can contour lines cross or split?

Contour lines do not cross each other, divide or split. 2. Closely spaced contour lines represent steep slopes, conversely, contour lines that are spaced far apart represent gentle slopes.

Why do we use 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.

What does Index contour mean?

Index contours are bold or thicker lines that appear at every fifth contour line. If the numbers associated with specific contour lines are increasing, the elevation of the terrain is also increasing.

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