Question

In above Figure, what is the contour interval of the map?

• A. 25 feet
• B. 10 feet
• C. 50 feet
• D. 100 feet

Answer 1

The correct option is C 50 feet

Contour interval is the vertical distance between the two contour lines which are next to each other.

In the given figure contour interval is 50 feet. It is determined as follows:

Let’s take an example of two contour lines which are labelled.

Point D is marked at 10,000 elevation and the next label is marked as 10,500 elevation.

10,500-10000=500 feet

Between these two contour lines if we count, there are 10 counter lines.

500/10=50

That means each counter line has 50 feet difference.

We can cross check it as follows:

50 * 10 ( as there are 10 contour lines between 10.500 labelled and 10000 labelled points ) = 500 feet.