contour line: meaning, definition, pronunciation and examples
C1Technical/Academic
Quick answer
What does “contour line” mean?
A line on a map connecting points of equal height or value.
Audio
Pronunciation
Definition
Meaning and Definition
A line on a map connecting points of equal height or value.
In a broader sense, it can refer to any line marking the outline, edge, or changing level of a shape, figure, or field (e.g., in art or data visualization).
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. Pronunciation differs (see IPA). Spelling remains the same.
Connotations
Identical technical connotations. In both regions, associated with maps, topography, and precise measurement.
Frequency
Equally low-frequency in general language, but standard and equally frequent in technical contexts in both varieties.
Grammar
How to Use “contour line” in a Sentence
The contour line [connects/indicates] [points/values].A contour line [is drawn/is plotted] [on/for] [a map/a graph].Vocabulary
Collocations
Examples
Examples of “contour line” in a Sentence
verb
British English
- The software can contour the data to produce a relief map.
- We need to contour these elevation points before finalising the map.
American English
- The geologist contoured the subsurface pressure data.
- They'll contour the survey results to show the hill's shape.
adverb
British English
- The land rose contour-wise in steady increments. (Highly technical/rare)
American English
- The data was mapped contourly to show density. (Highly technical/rare)
adjective
British English
- The contour map was essential for planning the walk.
- They studied the contour diagram in the geography textbook.
American English
- The contour plot revealed a hidden valley.
- She analyzed the contour chart of atmospheric pressure.
Usage
Meaning in Context
Business
Rare. Might appear in reports related to land development, construction, or mining.
Academic
Common in geography, geology, environmental science, and meteorology papers and textbooks.
Everyday
Very rare. Used mainly when discussing hiking maps or land surveys.
Technical
The primary context. Used in cartography, surveying, GIS (Geographic Information Systems), and 3D modelling.
Vocabulary
Synonyms of “contour line”
Vocabulary
Antonyms of “contour line”
Watch out
Common Mistakes When Using “contour line”
- Using 'contour' as a verb in this context (e.g., 'The map contours the lines') is unnatural. The verb is 'to contour' but the noun phrase is fixed.
- Confusing 'contour line' with 'outline' or 'silhouette'.
FAQ
Frequently Asked Questions
In technical map contexts, they are often used interchangeably, though 'contour line' is more explicit. 'Contour' alone can also refer to the shape or outline of something (e.g., the contours of a face).
Closely spaced contour lines indicate a rapid change in elevation, meaning the terrain is steep, like a cliff or a sharp ridge.
No, two contour lines representing different elevations can never cross on a standard topographic map. If they did, it would mean a single point has two different heights, which is impossible.
Contour lines (often called isolines or isopleths) are used in weather maps (isobars for pressure, isotherms for temperature), in medical imaging (like MRI scans), and in 3D computer graphics to model surfaces.
A line on a map connecting points of equal height or value.
Contour line is usually technical/academic in register.
Contour line: in British English it is pronounced /ˈkɒn.tʊə(ɹ) ˌlaɪn/, and in American English it is pronounced /ˈkɑːn.tʊr ˌlaɪn/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “Read between the lines (not directly related but a common pun in teaching map skills)”
Learning
Memory Aids
Mnemonic
Imagine a mountain wearing a CONTOUR belt (a line) that goes all the way around at the same height.
Conceptual Metaphor
SHAPE IS A LINE (The three-dimensional shape of the land is represented by two-dimensional lines).
Practice
Quiz
What is the primary function of a contour line?