earth's dimensions
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IsolinesAn isoline is a line connecting points of equal value.
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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!)
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Rules for Drawing Isolines:
1. Isolines connect points of equal value.
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2. Isolines are gentle, curving lines- no sharp corners.
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3. Isolines are always closed curves even though the map might only show part of it.
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4. Isolines NEVER cross- this would mean that one point has two different values. Ex: one spot has two temperatures?
20°
30 °
40 ° 50 ° 60 °
X
YZ
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5. Isolines usually are parallel. (They have a parallel trend.)
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Visualizations of contour lineshttp://geology.asu.edu/~sreynolds/topo_gallery/topo_gallery.htm
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GradientGradient shows how quickly the value changes from one point to another.
Gradientvalue
dis c e
tan
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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
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Making Contours worksheetsWorksheets can be printed from:http://www.rcmurphy.net/Medina%202005/documents/Contours123.doc
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Highlight data points.
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Fill in gaps in data.
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Connect the dots.
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Go on to the next value.
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Making a Contour Map II
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Drawing Contour Maps III
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