(redirected from Isopleths)
Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.
Related to Isopleths: isohyet, isoclinic lines


(Physical Geography) a line on a map connecting places registering the same amount or ratio of some geographical or meteorological phenomenon or phenomena. Also called: isogram or isoline
[C20: from Greek isoplēthēs equal in number, from iso- + plēthos multitude, great number]


(ˈaɪ səˌplɛθ)

a line drawn on a map through all points having the same numerical value, as of a population figure or geographic measurement.
[1905–10; < German Isoplethe (1877) < Greek isoplēthḗs equal in number]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.isopleth - a line drawn on a map connecting points having the same numerical value of some variable
isobar - (meteorology)an isogram connecting points having equal barometric pressure at a given time
isochrone - an isogram connecting points at which something occurs or arrives at the same time
isoclinal, isoclinic line - an isogram connecting points of equal magnetic inclination
isohel - an isogram connecting points receiving equal amounts of sunshine
isotherm - (meteorology) an isogram connecting points having the same temperature at a given time
line - a spatial location defined by a real or imaginary unidimensional extent
References in periodicals archive ?
To identify areas of concentrated use within a home range, we generated 75% AK isopleths (U.
2007) with Gaussian (bivariate normal) distributions, reporting the 95% and 50% isopleths for ranges and cores, respectively.
Mold isopleths are temperature-dependent curves of constant growth; the lowest shows at which conditions the mold takes theoretically "infinite" time to start growing (Sedlbauer 2001).
Two years later, [18] and [2] presented a map of the Niger Delta showing the isopleths of oil concentration as measured by infrared spectrography, thus improving the information available a great deal, although not to full satisfaction.
Basic problems, techniques, and theory of isopleths mapping.
To further investigate meteorological effects on dry and wet deposition, the isopleths for atmospheric mercury concentrations, dry mercury deposition rates, and wet mercury deposition rates are illustrated for the Conesville coal-fired power plant during February in Figures 3, 4 and 5, respectively.
MATERIALS AND METHODS--Based on previous estimates of abundance and distribution of pronghorns (deVos, 1999; Arizona Game and Fish Department, 2004) and precipitation isopleths (Sellers and Hill, 1974), we selected 10 study areas consisting of various Game Management Units in Arizona (Fig.
A model of this type can develop concentration isopleths over an area from weather data averaged over a variety of time periods such as a day, month or year.
The output of a computer noise modeling can be isopleths as presented in color sound level contours.
Smoothed isopleths give a more clear overview of the deposit and allow to extrapolate the data beyond the data points.