# Can contour line cross each other?

### Can contour line cross each other?

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. This is an INDEX contour line. Rule 5 - Contour lines are closer together in steep terrain and farther apart in flat areas.

### Why can contour lines never intersect?

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

### Can contour lines branch?

Contour elevations are shown on the uphill side of lines or in breaks to avoid confusion. ... Contours cannot branch or wye into two contours of the same elevation. Controlling features in locating contours are usually drainage lines. Contour lines crossing a stream point upstream and form form V's.

### What is the space between contour lines called?

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. If the numbers associated with specific contour lines are increasing, the elevation of the terrain is also increasing.

### 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.

### Are contour lines always closed?

Contour lines always close to form an irregular circle. Note that sometimes contour lines extend beyond the area on a map so you may not see the entire closed circle.

### What are the characteristics of contour lines?

The contours have the following characteristics:

• Contour lines must close, not necessarily in the limits of the plan.
• Widely spaced contour indicates flat surface.
• Closely spaced contour indicates steep ground.
• Equally spaced contour indicates uniform slope.
• Irregular contours indicate uneven surface.

### How to find the intersection of two contours?

Now, the two lines intersect if y is between the two endpoints ( y0a<y<y0b ), and the resulting (x,y) point will give you the intersection coordinate. You'll have to check the intersection between each pair of lines of the two contours, but as the equations are simple, this operation will still be much faster than any other method.

### Can you have more than one contour line on a map?

A contour line is a line joining all points of equal height or elevation on a map. Therefore, in one particular section of a map, there cannot be more than one contour line for a particular elevation. Thus contour lines will never intersect.

### Can a contour line meet a vertical cliff?

Contour lines generally do not meet or intersect each other. If contour lines are meeting in some portion, it shows existence of a vertical cliff. Vertical cliff and its contour Contours of different elevations cannot cross each other.

### What happens if contours of different elevations cross each other?

Contours of different elevations cannot cross each other. If contour lines cross each other, it shows existence of overhanging cliffs or a cave. The steepest slope of terrain at any point on a contour is represented along the normal of the contour at that point. Contours do not pass through permanent structures such as buildings.