Definition of isopleth in English:



  • A line on a map connecting points having equal incidence of a specified meteorological feature.

    • ‘Illustration of instantaneous irradiance or cumulative radiant exposure is achieved using a false-color rendering-mapping light intensity to color-creating irradiance or exposure isopleths.’
    • ‘The profiles could result from garnet growth parallel to Fe-Mg isopleths.’
    • ‘Only later did I realize that my success was due to the fact that I presented my results in classical ‘Margarian’ style, including isopleths and mathematical formulas.’
    • ‘The rapid rates of migration of trees, evident in the pollen isopleths, remain unexplained.’
    • ‘The scene observed in false color illustrates the incident light pattern so explicitly as to delineate irradiance isopleths.’


Early 20th century: from Greek isoplēthēs ‘equal in quantity’, from Greek isos ‘equal’ + plēthos ‘multitude, quantity’.