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Isolines
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  1. Isolines • An isoline is a line connecting points of equal value.

  2. 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!)

  3. Rules for Drawing Isolines: • 1. Isolines connect points of equal value. 5 5 10 10 10 10 15 15

  4. 2. Isolines are gentle, curving lines- no sharp corners. 5 5 10 10 10 10 15 15

  5. 3. Isolines are always closed curves even though the map might only show part of it.

  6. 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° Z Y

  7. 5. Isolines usually are parallel. (They have a parallel trend.)

  8. Gradient • Gradient shows how quickly the value changes from one point to another.

  9. 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

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

  11. Highlight data points.

  12. Fill in gaps in data.

  13. Connect the dots.

  14. Go on to the next value.

  15. Making a Contour Map II

  16. Drawing Contour Maps III