An isopleth is a line of equal or constant value on a map or grid of varying quantities.
Different types of isopleth are given different names according to the nature of the quantity involved:
- pressure: isobar.
- temperature: isotherm.
- dew point: isodrosotherm.
- humidity: isohume.
- wind speed: isotach.
- wind direction: isogon.
- liquid precipitation amount: isohyet
Synonyms: isogram, isarithm
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