Contour interval — Science definition
The elevation difference between successive contour values.
Where it is taught
- Topographic Maps & Gradients — Investigating Earth, Earth & Space Science, Grade 9
In use
The contour interval is the elevation difference between neighboring contour values.
Topographic Maps & Gradients
Questions using contour interval
Problem 1
Contour values are 100, 120, and 140 m. Find the contour interval.
Answer and explanation
20 m
Successive values differ by 20 m.
Problem 2
A contour interval is 20 m. How many metres does crossing 7 contour lines uphill represent?
Answer and explanation
140 m
7 × 20 = 140 m of elevation gain.