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 ?
The results are interesting, firstly because garnet isopleths fall in the stability field of modelledmineral assemblages which are also observed under the microscope.
The photochemical model used is the OZIPR model (Ozone Isopleth Plotting Program Research) (Gery and Crouse, 1990), which is a column or box model developed by the EPA (Environmental Protection Agency).
The main results of the calculations are data models of the deposit such as isopleths and 3D drawings of mining conditions like seam thickness, seam depth, calorific value of oil shale and oil yield.
These isopleths are usually shown on maps as fixed lines which do not indicate any uncertainty in the forecast.
In contrast, the T*DNA isopleths exhibit greater nonlinearity, reflecting the strong UV-B influence associated with ozone depletion.
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.
Isopleths use lines to join points with the same quantity or value (e.
Precipitation and air temperature were averaged over each region based upon the isopleths of normal values presented in Larkin and Bomar (1983).