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	isopleth. The Columbia Encyclopedia, Sixth Edition. 2001-05
		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.
		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).
	www.bartleby.com /65/is/isopleth.html (241 words)

	isopleth - Encyclopedia.com
		As in the two-dimensional case, the isopleths are orthogonal to the gradient.
		is the unit vector tangential to the isopleth of q, and k is the vertical unit vector...
		The isopleths of θ^sub E^ mimic the upward bulge...
	www.encyclopedia.com /doc/1E1-isopleth.html (1294 words)

	AllRefer.com - isopleth (Geology And Oceanography) - Encyclopedia
		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.
		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).
	reference.allrefer.com /encyclopedia/I/isopleth.html (300 words)

	Definition of isopleth - Merriam-Webster Online Dictionary
		Learn more about "isopleth" and related topics at Britannica.com
		Find more about "isopleth" instantly with Live Search
		See a map of "isopleth" in the Visual Thesaurus
	www.m-w.com /cgi-bin/dictionary?book=Dictionary&va=isopleth (83 words)

	Rules For Isopleth Analysis: (Site not responding. Last check: )
		When drawing the isopleths always keep lower values to one side and higher values to the other side of the isopleth as you draw.
		The isopleth should be drawn so that it is nearer the station which has a reading closer to the isopleth value.
		Following the initial analysis, smooth your isopleths; this analysis is not merely an exercise to "connect the dots", but it involves an effort to visualize the shape of the particular field and its gradients.
	www.borg.com /~glenn/umuc/170/wxanalysis/sld018.htm (225 words)

	SAA: Glossary of Archival Terminology
		Isopleth maps may use lines to show areas where elevation, temperature, rainfall, or some other quality is the same; values between lines can be interpolated.
		Isopleths may also use color to show regions where some quality is the same; for example, a map that use shades from red to blue to indicate temperature ranges.
		An isopleth differs from a choropleth because the lines or regions are determined by the data rather than conforming to a predefined area, such as a political subdivision.
	www.archivists.org /glossary/term_details.asp?DefinitionKey=2912 (110 words)

	Weather Maps Exercise
		Isopleths separate values which are greater than the isopleth value from values which are lower than the isopleth value.
		Isopleths are drawn at equal incremental values determined by the element represented and must be drawn for all values between the highest value of data plotted and the lowest value of data plotted.
		When an isopleth passes between two stations, the isopleth should be drawn proportionally closer to the station whose plotted element value is closest to the value of the isopleth.
	www.srh.noaa.gov /ohx/educate/current_environment.html (4971 words)

	CoCoRaHS - Community Collaborative Rain, Hail & Snow Network
		Isopleths are simply lines that connect measurements of equal value.
		Isopleths spread out indicate a small change and the gradient would be small, so would represent a gradual slope, or small weather-related change.
		Drawing isopleths on a map may be somewhat confusing, challenging, and difficult at first, but with practice, one can become good at it and actually enjoy studying the changes and analysis of a map; it can be quite satisfying to solve the daily weather puzzle.
	www.cocorahs.org /Content.aspx?page=Isopleths (1597 words)

	International Journal of Health Geographics \| Full text \| Exploratory disease mapping: kriging the spatial risk ...
		Due to the constant mean assumption ordinary kriging is the appropriate spatial prediction method and without nugget effect this leads to direct interpolation of the data at the counties centres and to smoothed values shrunken towards the global mean for the rest of the study area.
		Extraordinarily high prevalences were observed in the southern regions, which indicate the presence of a positive disease cluster that is identified by use of the spatial scan statistic [4].
		Only monochrome colours or shades of grey should be used along with isopleth mapping [36], as has been done here in order to avoid the natural preference of the human eye for bright colours and in deference to colour-blind map users.
	www.ij-healthgeographics.com /content/3/1/18 (5159 words)

	Isopleth Maps
		It shows the data as a third dimension on a map, thus isopleth maps are more common for mapping surface elevations, amounts of precipitation, atmospheric pressure, and numerous other measurements that can be viewed statistically as a third dimension.
		The isopleth interval is the difference in value between two adjacent isopleths.
		Isopleths never cross or divide and always form enclosed circles, however, this occurrence may not be in the mapped area.
	www.jsu.edu /depart/geography/mhill/phygeogone/isoplth.html (376 words)

	Re: Auroras
		The word Isopleth is derived from the Greek "Iso" meaning equal, and "Plethes" meaning quantity.
		Specific Isopleth names have been derived with the prefix "Iso", and a suffix referring to the particular measurement quantity.
		Isopleths are used for analyzing meteorological maps and charts for various atmospheric properties.
	www.madsci.org /posts/archives/dec96/845999030.Es.r.html (690 words)

	Amazon.com: isopleth (Site not responding. Last check: )
		Isopleth maps of pH and alkalinity in stream waters, and sodium in stream sediments of West Virginia (SuDoc I 19.91:I-2364-E) by U.S. Geological Survey (Unknown Binding - 1994)
		Isopleth maps of uranium, thorium, cerium, lanthanum, and related elements in stream sediments of West Virginia (SuDoc I 19.91:I-2364-F) by U.S. Geological Survey (Unknown Binding - 1994)
		Isopleth maps showing regional variations in pH of stream water and ground water in relation to geologic setting and known mineral deposits, Glens Falls...
	www.amazon.com /s?ie=UTF8&keywords=isopleth&tag=lexico&index=blended&link_code=qs&page=1 (438 words)

	isopleth.htm (Site not responding. Last check: )
		One way is to find the range of values in the field you have to isopleth, and then first draw isopleths near the maximum and minimum values.
		Now we have bounding 30 and 70 isopleths, so a good practice is to draw an isopleth about midway between these values.
		Now we have all of our trial isopleths drawn, but hopefully we have drawn lightly enough that we can make some adjustments so that the adjacent isotherm patterns are fairly consistent, and smooth.
	www.ems.psu.edu /Courses/Meteo200/isopleth/isopleth.htm (611 words)

	cocorahs isopleth activity 1 (Site not responding. Last check: )
		ISOPLETHS are simply lines that connect values or measurements of equal value.
		It is a form of graphing areas of equal altitude (topographic maps), temperature, pressure, precipitation, and many other useful measurements.
		Be certain to share your amount with all the other groups and get their amounts so you can complete your activity.
	ccc.atmos.colostate.edu /~hail/teachers/lessons/isopleth_activity1.htm (443 words)

	Isolines
		Isopleths are drawn on maps, graphs and charts to represent points of equal value.
		An isopleth separates regions of lesser value from regions of higher value.
		Strictly speaking an isopleth is a line of equal value of a mathematical function and a
	www.shorstmeyer.com /msj/geo165/iso.html (470 words)

	LoCoH Homerange Generator
		Because the hulls are merged smallest to largest, the 10th percentile isopleth also represents the 'densest' or most heavily used part of the habitat.
		k-NNCH isopleth also have the property of converging to the true area represented by the data as the number of data points increases (Getz and Wilmers 2004), thus the method is particularly well suited when there is a lot of observational data (e.g., from a GPS collar).
		Larger values of k increase the total area of the isopleths, but values which are too large can result in local hulls that cut across areas where the animal was not observed and is unlikely to use.
	nature.berkeley.edu /~alyons/locoh (839 words)

	CFD Modelling
		Isometric isopleth surfaces of LEL and UEL gas concentrations can also be generated, but due to the computer time required to download the 3D dump files there is an additional cost of £20 per isopleth surface map.
		Isometric isopleth surfaces of critical values of the above criteria of impairment may be generated; however due to the computer time required to download the 3D 'dump files' there is an additional cost of £20 per isopleth surface map.
		Isometric isopleth surfaces of critical values of the above criteria of impairment may also be generated; however due to the computer time required to download the 3D 'dump files' there is an additional cost of £20 per isopleth surface map.
	www.multiplan.co.ae /cfd_modelling.htm (1189 words)

	CHAPTER 10 - LANDSLIDE HAZARD ASSESSMENT
		Isopleth maps are an acceptable option at this stage of development but are wholly unsuitable for use in the more detailed planning stages.
		Alteration of the isopleth map is described in detail in Section C's discussion of "Compensating for Insufficient Data-The Isopleth Map".
		The final isopleth map is used as an overlay on the landslide hazard map.
	www.oas.org /cdmp/document/NHP/oea66e/ch10.htm (11098 words)

	General circulation, systematic model errors and predictability
		The third schematic shows the isopleth at a forecast range in which errors are growing nonlinearly.
		A (singular) vector pointing along the major axis of the pdf ellipsoid is shown in (b), and its pre-image at initial time is shown in (a).
		(c) The evolution of the isopleth during the nonlinear phase is shown in (c); there is still predictability, though the pdf is no longer Gaussian.
	www.ecmwf.int /newsevents/training/rcourse_notes/PREDICTABILITY/PREDICTING_UNCERTAINTY/Predicting_uncertainty3.html (1361 words)

	LoCoH Homerange Generator
		Creating isopleths is normally done after you have selected an optimal value of k.
		The isopleth interval is the increment of additional points in each isopleth, measured as a percentage of the total number of points.
		An isopleth interval of 10 will result in 10 isopleths being generated (10%, 20%, 30%, etc.), an isopleth interval of 5 will result in 20 isopleths, and so on.
	nature.berkeley.edu /~alyons/locoh/av3x/index.html (2167 words)

	LoCoH: Powerful algorithms for finding home ranges.
		LoCoH isopleths also have the property of converging to the true area represented by the data as the number of data points increases, thus the method is particularly well suited when there is a lot of observational data (e.g., from a GPS collar).
		Isopleths contain a certain number of the data points and are sorted by density.
		Thus the 10% isopleth is the merger of the smallest hulls that contain 10% of all the original data points.
	l2.palary.com (1690 words)

	Ozone Isopleths
		The isopleths were created by running ChemTest, a computer model created by Dr. Harvey Jefferies, that simulates the complex chemical reactions occurring in the atmosphere between NOx and VOCs to produce ozone.
		The isopleths are used for determining ozone levels at specific combinations of NOx and VOCs in the atmosphere and to determine whether a region is NOx or VOCs limited.
		This is because an increase in NOx moves the point to another isopleth where an increase in VOCs only moves the point in question along the same isopleth, not increasing the ozone concentration.
	www.unc.edu /~meagsmch/ozone/o3isopleth.htm (203 words)

	Ford Foundation: The American Energy Consumer - 135
		At this point a concentration value appears in each grid and it is possible to construct maps of a pollutant by linking concentrations that are equal.
		In other words, everything inside this isopleth is more than ten while everything outside it but inside the next isopleth is less than ten but more than five.
		Thus, isopleths are like bullseyes: the closer to the center the higher the value.
	www.fordfound.org /elibrary/documents/0215/159.cfm (633 words)

	Choropleth maps
		Isopleth maps differ from choropleth maps in that the data is not aggregated to a pre-defined unit like a political area or watershed basin.
		Temperature, for example, is a phenomenon that should be mapped using isoplething, since temperature exists at every point (is continuous), yet does not change abruptly at any point (like tax rates do as you cross into another political zone).
		Elevation maps should always be in isopleth form for this reason.
	www.ncgia.ucsb.edu /education/curricula/cctp/units/unit47/html/mas_form.html (734 words)

	CONTOUR ANALYSIS
		The values of the data points one side of the line should all be greater than, or all of them should be less than the value of the isopleth.
		You might start analyzing a contour by drawing tic marks on the map to mark where the isopleth should be, then connect the dots.
		The spacing of the isopleths indicates how rapidly conditions are changing in the horizontal direction.
	cimss.ssec.wisc.edu /wxwise/contour/contour1.html (1110 words)

	Tips on drawing Isopleths (Site not responding. Last check: )
		Isopleth is a Greek word meaning equal value.
		It means to connect equal values of a meteolological variable with a line.
		* Draw isopleths all the way to the boundary of the plotted data or until it closes in on itself creating a loop.
	www.dnr.sc.gov /climate/sercc/education/saer/isopleths.html (148 words)

	8. PLOTTING CHARTS OF RELATIVE ABUNDANCE (Site not responding. Last check: )
		The isopleth map, in which the lines connect equal rates or ratios for specific areas.
		The third consideration is the laying out of the “isopleths” which are drawn with reference to the values indicated by the control points in each statistical area.
		The fourth consideration is the choice of intervals for the isopleths.
	www.fao.org /DOCREP/003/X6602E/x6602e09.htm (405 words)

	isopleth calculations
		Isopleth in a divariant field in PT We wish to calculate the isopleths (lines of constant composition) for almandine content in garnet in the assemblage garnet + kyanite + biotite + muscovite + quartz.
		An isopleth in a divariant field is a line (effectively univariant)
		As seen below, the x(g)=0.85 isopleth runs through 870°C at 5 kbar, 620°C at 7 kbar and 458°C at 10 kbar pressure.
	www.es.mq.edu.au /jmg/1998/thfiles/logiso.html (527 words)

	ISOPLETHS
		The following is a list of all the important isopleths encountered in operational meteorology.
		An isopleth is a line or curve of equal values.
		They are not a pure isopleth by definition.
	www.theweatherprediction.com /basic/isopleths (976 words)

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