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GCSE Geography · key term
A line on a map joining points with the same value of a measured variable.
Used by AQA and OCR
Paper 1, Paper 2, Paper 3
A line on a map joining points with the same value, such as the same temperature.
Revise: Data Presentation and AnalysisAn isoline map requires estimates between measured points. In a fictional example, suppose temperature rises steadily from 10°C at one point to 14°C at another. The estimated position of the 12°C isoline is halfway between them.
Read isoline labels as well as spacing. Close lines show rapid change, but the labels show whether values rise or fall.
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Specification 9.1 · Paper 1, Paper 2, Paper 3
A line on a map joining points with the same value of a measured quantity, such as height.
Revise: Fundamental OS Map Skills: Scale, Coordinates and ReliefContours are one type of isoline: a line joining points with an equal value. Other isoline maps represent different quantities rather than land height.
A line joining locations with the same value of a variable, such as height, rainfall or temperature.