ISOPLETHS

An isopleth is a feature of meteorological charts, connecting points which have an equal value of some variable at a given time and spatial area. The particular variables shown on a given chart may include values such as pressure, temperature, wind speed, etc. They are used to assist in visualizing the general features of a meteorological "field". Some common types of isopleths include:
'Isobar': a line of equal or constant pressure.
'Isobront': a line drawn through geographical points at which a given phase of thunderstorm activity occurred simultaneously.
'Isodop': a line of equal Doppler velocity on a radar display.
'Isodrosotherm': a line of equal dewpoint.
'Isoecho': a line of equal radar reflectivity on a radar display.
'Isogon': a line of constant direction of some vector quantity (usually used to describe the wind direction field).
'Isoheight': a line of constant geopotential height on a constant pressure surface chart. Because of their ubiquity, they are commonly referred to simply as "contours".
'Isohume': a line of constant humidity.
'Isohyet': a line of constant amount of precipitation during a given time period.
'Isohypse': same as an isoheight.
'Isotach': a line of constant wind speed.
'Isotherm': a line of constant temperature.

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Adaptations of isopleths in other sciences

Adaptations of isopleths in other sciences

In sociolinguistics and dialectology, an isogloss is a line on a map showing the boundary between two regional speech variants.