A line on a map connecting points having equal incidence of a specified meteorological feature.
- The profiles could result from garnet growth parallel to Fe-Mg isopleths.
- 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 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 isos 'equal' + plēthos 'multitude, quantity'.
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