isopleth

(ˈaɪsəʊˌplɛθ) n (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]

i•so•pleth

(ˈaɪ səˌplɛθ)

n. 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]

Thesaurus

Noun

isopleth - a line drawn on a map connecting points having the same numerical value of some variableisarithm, isogramisobar - (meteorology)an isogram connecting points having equal barometric pressure at a given timeisochrone - an isogram connecting points at which something occurs or arrives at the same timeisoclinal, isoclinic line - an isogram connecting points of equal magnetic inclinationisohel - an isogram connecting points receiving equal amounts of sunshineisotherm - (meteorology) an isogram connecting points having the same temperature at a given timeline - a spatial location defined by a real or imaginary unidimensional extent

isopleth

(ī`səplĕth'), line drawn on a map through all points of equal value of some measurable quantity. In many meteorologic, oceanographic, or geologic studies some physical or chemical property is examined that varies from place to place on a map. Isopleths showing the quantity of the property being studied can be drawn on the map to highlight regional trends of high or low abundance of that property. For example, topographic maps showing contourscontour
or contour line,
line on a topographic map connecting points of equal elevation above or below mean sea level. It is thus a kind of isopleth, or line of equal quantity.
..... Click the link for more information. of equal elevation are probably the most common type of isopleth maps. Relief "highs" (hills) are shown by concentric contour isopleths, and depressions such as volcanic craters are shown by concentric contours with hachures pointing toward the center of the depression. Isopleths are drawn on weather maps to indicate lines of equal air pressure (isobars) and equal temperature (isotherms). Isobaths are lines connecting points of equal depth in lakes and oceans. Isopach maps show distribution of thickness of a given rock unit. Gravity maps are drawn showing isogals (lines of equal gravitational acceleration). Variations in the strength of the earth's magnetic field are shown by isogams (after gamma, the common unit for measuring magnetic strength).

isopleth

[′ī·sə‚pleth] (mathematics) The straight line which cuts the three scales of a nomograph at values satisfying some equation. Also known as index line. (meteorology) A line of equal or constant value of a given quantity with respect to either space or time. Also known as isogram. More specifically, a line drawn through points on a graph at which a given quantity has the same numerical value (or occurs with the same frequency) as a function of the two coordinate variables. Also known as isarithm.

isopleth

On a chart or a graph, a line of constant value of a given quantity with respect to either space or time. Also called an isogram.

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Synonyms for isopleth

noun a line drawn on a map connecting points having the same numerical value of some variable

Synonyms

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