Isopleths


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Related to Isopleths: isohyet, isoclinic lines

Isopleths

 

isograms on a graph, where values differing from the geographic coordinates are laid off along one or both coordinate axes. Topoisopleths and chronoisopleths are distinguished. Topoisopleths are plotted in profile with the distance from acertain point laid off on the x-axis and the height or depth, on the Y-axis. In this way it is possible to depict the distribution (for a certain moment or averaged over time) of moisture in soils, salinity and temperature of bodies of water, different characteristics of the atmosphere, and so on. Chronoisopleths are plotted on a graph with the following coordinates: time and height (depth, see Figure 1) or time and geographic latitude. In this way the changes with time (for certain elevations, depths, or latitudes) of the same factors are depicted. Chronoisopleths are also used to show changes in elements of the radiation balance, length of the day, and so on along the meridian.

Figure 1. Chronoisopleths of soil temperature as a function of time of year (months) and depth

References in periodicals archive ?
Grey shading shows compositional range in H; red lines are isopleths. Where a match between Q and H is possible, the goodness of the match depends critically on the number of samples taken of W, F, b, and H.
a) Isopleths of abundance (kg km-[lineal.sup.-1]), and b) mean carapace length (mm) (both genders) of Heterocarpus reedi estimated in surveys using swept area method by latitude and year.
For sample Z8, the garnet core composition isopleths intersect at 5.4-6.8 kbar/543-570oC in Grt-St-Pl-Chl, Grt-St-Pl-Chl-Zo and Grt-St-Chl-Zo fields.
Hence the isopleths showed that wet mercury deposition is centered in the mercury emission source.
We collected and summarized aerial survey data based on landscape-scale areas corresponding to gauging stations and associated precipitation isopleths, and defined populations as total number of pronghorns counted during surveys within study areas comprised of Game Management Units associated with gauging stations (Fig.
The results, usually tested in an environmental chamber, are often displayed in the form of 2- or 3-dimensional isopleths indicating whether VOCs or N[O.sub.x] or both, would be most effective in controlling ozone.
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.
Weather forecasts of such things as high/low pressure regions, temperatures, precipitation, etc., are often displayed as isopleths; that is, lines connecting points of equal value of the particular variable in question.
Plotting isopleths of Pinus growth as a function of both WSI and light and overlaying composition of plots at their mean WSI and light values indicated that communities dominated by Liquidambar had the greatest effect on Pinus growth through reduction in light, while pure Andropogon communities reduced Pinus growth by increasing Pinus water stress; in mixed communities Pinus growth was constrained more equally by both light and water stress.
Question 9 asks how we might eliminate Map 3 by adding its isopleths to Map 1 -- without using dashed lines.