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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 ?
We divided kernels into twenty regions of use, and considered the area inside the 95% isopleth (regions 1-19) as the home range boundary and the region within the 50% isopleth (regions 1-10) as the core area (Seaman and Powell 1996, Howell and Chapman 1997, Barg et al.
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.
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.
Three-dimensional isopleth plots were constructed to assess the response of the conditional intrinsic rate of population increase parameter, r, to different inputted combinations of fishing mortality and the age at which 50% of sharks were selected.
To summarize agricultural pesticide use in the Salinas Valley, we first defined the region as the area bounded by the Pacific Ocean and an isopleth at 200 feet in elevation above the Salinas River.
The annex further-on looked to recent advances in mold and mildew research, with isopleth interpretation, sensitivity of substrates for mould infestation and mold growth modeling as specific topics.
Areas occupied by wolf packs (80% isopleth of harmonic mean) had average road densities of 0.
ambulance, fire truck, police), and add text to the GIS map; the capability to import scenarios developed in TRACE(R) into Real-Time(R); and the capacity to dynamically change isopleth limits.
We selected the 50% kernel density isopleth to represent areas of high use (core areas) within the territory and the 95% isopleth for the territory as they have been commonly applied in previous studies (Worton 1989, Frank and Lutz 1999, Rivera et al.
We used the 50-percent isopleth of the 80 m UD to identify home range cores.