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(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 ?
The 50% isopleth was considered the core activity period, the time range of peak activity.
was determined using the yield isopleth diagram that was used to estimate the fishing status of B.
Integrating Equation 5 over the region of an ellipsoid (S) gives the probability of data falling within this ellipsoidal isopleth area as seen in Equation 6, where the exponential portion of Equation 5 is set equal to -[c.
A Isobar B Isohyet C Isotherm D Isopleth QUESTION 10 - for 10 points: Which type of drug is used to treat allergic reactions?
68 TABLE 2--Vegetation composition within the study area and the 95% kernel density isopleth home ranges of male island foxes, Santa Rosa Island, California, 2009-2010.
First and last dates of collaring, record length, and home range area in summer and winter from fixed-kernel estimates using a 95% isopleth for 12 GPS-collared moose.
1A, 2A, 3A) reveals an ongoing stratification lake stably stratified throughout the year, with the 2mg/L isopleth consistently located at a depth close to 10m below the surface.
describing use of isopleth lines and historical weather data to predict
Geostatistical analysis of disease data: Accounting for spatial support and population density in the isopleth mapping of cancer mortality risk using area-to-point Poisson kriging.
Furthermore, we captured 75% of adult Fishers within the 90% isopleth (90% UD) of their respective winter utilisation distribution (estimated from >30 temporally independent radio-locations collected over >10 mo using Animal Movement extension to ArcView [Hooge and Eichenlaub 1999]); 75% of these 90% UDs were [greater than or equal to]17.