What is a line connecting points of equal temperature called?
On a Weather Map, the lines connecting points of equal temperature are called Isotherms.Similarly, the lines that connect points of equal barometric pressure are called Isobars. What is a line connecting points of equal elevation?
What is an Isoline in math?
In general, an isoline is a line along which a variable is held constant. ... An isoline (from Greek ισος (isos), meaning 'equal'), (also called a level set, isopleth, or isarithm) of a continuous field (a function of two-dimensional space v=f(x,y) ), is a curve along which the function has a constant value.
What is an isotherm on a map?
An isotherm (from θεϝμη or thermē, meaning 'heat') is a line that connects points on a map that have the same temperature. Therefore, all points through which an isotherm passes have the same temperatures at the time indicated.
Why do we use isolines on weather maps?
These are often shown on weather maps in newspapers and TV weather forecasts. Geographers often use isolines to help them map the distribution of things. When isolines are combined with colouring or shading they make it possible to easily see data that would be hard, or impossible, to understand as a table or chart of numbers.
What is the name given to an Isoline line which connects points of equal temperatures?
IsothermIsotherm - A line connecting points of equal temperature.
What is the name of the Isoline that connects points with equal air pressure?
IsobarsIsobars are used to show the distribution of air pressure . Some common isolines encountered in physical geography are: isotherm: a line connecting points of equal temperature. isohyet: a line that connects points of equal precipitation.
What are lines of equal temperature on a map called?
Isotherms are lines of constant or equal temperature. They are often used on weather maps by meteorologists to give a large scale view of temperatures across the U.S. If you have ever looked at a weather map in a newspaper, the isotherms are used to divide the color-filled temperatures.
What is an Isoline that connects points on a map which have the same elevation?
contour lineIn cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level.
What is the term for a line that connects equal points of pressure?
A line drawn on a weather map connecting points of equal pressure is called an "isobar". Isobars are generated from mean sea-level pressure reports and are given in millibars.
What is a line that connects equal points of data?
Isolines are lines drawn to link different places that share a common value. The prefix 'iso' is a greek word meaning equal, so an isoline must be a line joining equal points. For example, a line drawn on a map to join up all the places that are the same height above sea level is called a contour.
What connects points of equal temperature?
IsothermIsotherm. A line representing points of equal temperature.
What are called Isolines?
Isolines are lines drawn on a map connecting data points of the same value. They are commonly used by geographers. Contour lines, for example, show relief and connect points on the map that have the same height.
What connects points of equal elevation on a topographic map?
ContoursContours are imag- inary lines that join points of equal elevation on the surface of the land above or below a reference surface, such as mean sea level. Contours make it possible to measure the height of mountains, depths of the ocean bottom, and steep- ness of slopes. A topographic map shows more than contours.
What do isobars join?
Isobars are lines on a weather map that join places of equal pressure. Meteorologists collect information from weather stations, buoys and ships and then draw smooth curves to join the dots.
What are lines of equal elevation called?
contour line, a line on a map representing an imaginary line on the land surface, all points of which are at the same elevation above a datum plane, usually mean sea level. The diagram illustrates how contour lines show relief by joining points of equal elevation.
What is an isoline?
An isoline (from Greek ισος ( isos ), meaning 'equal'), also called a level set or isarithm, is a curve along which a continuous field has a constant value. Isolines show connections between two places that share a common value. Geographers use isolines to map the distribution of different elements. The most common example in cartography is ...
What is the purpose of isolines in geography?
Geographers use isolines to map the distribution of different elements. The most common example in cartography is a contour line, which are used in topographic maps to join places that have the same height value.
What is contour interval?
The contour interval of a topographic map is the difference in elevation between successive contour lines.
What is an isobar?
An isobar (from βαϝος or baros, meaning 'weight') is a line of equal or constant pressure on a graph, plot, or map; an isopleth or contour line of pressure. More accurately, isobars are lines drawn on a map joining places of equal average atmospheric pressure reduced to sea level for a specified period of time.
What is the name of the line that is used to map a meteorological map?
Isolines are often given specific names beginning "iso-" according to the nature of the variable being mapped, although in many usages the word "contour line" is most commonly used. Specific names are most common in meteorology, where multiple maps with different variables may be viewed simultaneously.
Why are weather stations drawn at contour lines?
Instead, lines are drawn to best approximate the locations of exact values based on the scattered information points available.
What is isobar in weather?
An isostere is a line of constant atmospheric density. An isoheight or isohypse is a line of constant geopotential height on a constant pressure surface chart.
What is an isoline?
d. What are Isolines? Isolines are lines drawn to link different places that share a common value. The prefix 'iso' is a greek word meaning equal, so an isoline must be a line joining equal points. For example, a line drawn on a map to join up all the places that are the same height above sea level is called a contour.
What is the name of the line that connects points of the same height above ground?
Here's a list of isolines you might discover as you explore geography ... Contour line:Joins points of the same height above ground.
Why do geographers use isolines?
Geographers often use isolines to help them map the distribution of things. When isolines are combined with colouring or shading they make it possible to easily see data that would be hard, or impossible, to understand as a table or chart of numbers.
What is the difference between isoplat and isopleth?
Isoplat:Joins places of equal acidity (used, for example, for mapping acid rain). Isopleth:Joins points of the same value (as a number), such as population or car ownership. Isopor:Joins points that have the same annual change in magnetic declination. Isostere:Joins points with the same atmospheric density.
What is the name of the group of points with the same atmospheric pressure?
Isobar:Joins points with the same atmospheric pressure. Isotherm:Joins points with the same temperature. Isobathytherm: Joins points with the same temperature under water. Isoc heim:Joins points with the same mean temperature in winter. Isothere:Joins points with the same mean summer temperature.
What is contour line?
Contour lines are isolines joining places that have the same height value. Another common isoline is the isobar, a line that joins places with the same atmospheric pressure. These are often shown on weather maps in newspapers and TV weather forecasts. Geographers often use isolines to help them map the distribution of things.
History
- The idea of lines that join points of equal value was rediscovered several times. In 1701, Edmond Halley used such lines (isogons) on a chart of magnetic variation. The Dutch engineer Nicholas Cruquius drew the bed of the river Merwede with lines of equal depth (isobaths) at intervals of 1 fathom in 1727, and Philippe Buache used them at 10-fathom intervals on a chart of the English …
Types of Isolines
- Isolines are often given specific names beginning "iso-" according to the nature of the variable being mapped, although in many usages the word "contour line" is most commonly used. Specific names are most common in meteorology, where multiple maps with different variables may be viewed simultaneously. In general, an isolineis a line along which a variable is held constant. Isar…
Medicine
- Various medicine disciplines, such as Oncology, use isolines to show data obtained from tests and charts. Specifically, isodose curves are lines joining the points of equal percentage depth dose and are used measure radiation intensity and to depict variations in absorbed dose rates and compare them to predicted absorbed dose rates.
Technical Construction Factors
- Traditionally, every fifth or tenth contour is symbolized with a thicker line or a different color than those contours that appear between. The difference in line widths and colors allows for quick slope calculations and easy visual interpretation. Contours are harder for the untrained eye to decipher than a hillshade(Shaded Relief), but they are a more accurate representation of the act…
Labeling Contour Maps
- Labelsare a critical component of elevation maps. A properly labeled contour map helps the reader to quickly interpret the shape of the terrain. If numbers are placed close to each other, it means that the terrain is steep. Labels should be placed along a slightly curved line "pointing" to the summit or nadir, from several directions if possible, making the visual identification of the su…
External Links
- See also Forthright's Phrontisteryfor many more different types of isopleths.
- National Science Digital Library - Isobar
- Contours, the Nature of Geographic Information, Chapter 7, page 5; Penn State University, Department of Geography. Accessed 27 April, 2010