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Isolines

Isolines are often used on maps to represent points of equal value. This is a list of some common (as well as obscure) types of isolines. The prefix "iso-" means "equal."

isobar
A line representing points of equal atmospheric pressure
isobath
A line representing points of equal depth under water
isobathytherm
A line representing depths of water with equal temperature
isochasm
A line representing points of equal recurrence of auroras
isocheim
A line representing points of equal mean winter temperature
isochrone
A line representing points of equal time-distance from a point, such as the transportation time from a particular point
isodapane
A line representing points of equal transport costs for products from production to markets
isodose
A line representing points of equal intensity of radiation
isodrosotherm
A line representing points of equal dew point
isogeotherm
A line representing points of equal mean temperature
isogloss
A line separating linguistic features
isogonal
A line representing points of equal magnetic declination
isohaline
A line representing points of equal salinity in the ocean
isohel
A line representing points receiving equal amounts of sunshine
isohume
A line representing points of equal humidity
isohyet
A line representing points of equal precipitation
isoneph
A line representing points of equal amounts of cloud cover
isopectic
A line representing points where ice begins to form at the same time each fall or winter
isophene
A line representing points where biological events occur at the same time, such as crops flowering
isoplat
A line representing points of equal acidity, as in acid precipitation
isopleth
A line representing points of equal numerical value, such as population
isopor
A line representing points of equal annual change in magnetic declination
isostere
A line representing points of equal atmospheric density
isotac
A line representing points where ice begins to melt at the same time each spring
isotach
A line representing points of equal wind speed
isothere
A line representing points of equal mean summer temperature
isotherm
A line representing points of equal temperature
isotim
A line representing points of equal transport costs from the source of a raw material

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