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Isolines - PowerPoint PPT Presentation


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Isolines. An isoline is a line connecting points of equal value. Examples of isolines:. Isotherms: points of equal temperature Isobar: points of equal barometric (air) pressure Contour: points of equal altitude Concentration of chemicals Anything else you can get a value for.

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isolines
Isolines
  • An isoline is a line connecting points of equal value.
examples of isolines
Examples of isolines:
  • Isotherms:
    • points of equal temperature
  • Isobar:
    • points of equal barometric (air) pressure
  • Contour:
    • points of equal altitude
  • Concentration of chemicals
  • Anything else you can get a value for.
  • (The weather channel loves isolines!)
rules for drawing isolines
Rules for Drawing Isolines:
  • 1. Isolines connect points of equal value.

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slide7
2. Isolines are gentle, curving lines- no sharp corners.

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5

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slide9
4. Isolines NEVER cross- this would mean that one point has two different values. Ex: one spot has two temperatures?

60 °

50 °

40 °

30 °

X

20°

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Y

visualizations of contour lines
Visualizations of contour lines
  • http://geology.asu.edu/~sreynolds/topo_gallery/topo_gallery.htm
gradient
Gradient
  • Gradient shows how quickly the value changes from one point to another.
slide14
A steep (high) gradient changes quickly and the isolines are close together.
  • A gentle (low) gradient changes slowly and the lines are far apart.

Steep area

Gentle area

making contours worksheets
Making Contours worksheets
  • Worksheets can be printed from:
  • http://www.rcmurphy.net/Medina%202005/documents/Contours123.doc