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# Earth's dimensions

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### Earth's dimensions

1. 1. Isolines <ul><li>An isoline is a line connecting points of equal value. </li></ul>
2. 2. Examples of isolines: <ul><li>Isotherms: </li></ul><ul><ul><li>points of equal temperature </li></ul></ul><ul><li>Isobar: </li></ul><ul><ul><li>points of equal barometric (air) pressure </li></ul></ul><ul><li>Contour: </li></ul><ul><ul><li>points of equal altitude </li></ul></ul><ul><li>Concentration of chemicals </li></ul><ul><li>Anything else you can get a value for. </li></ul><ul><li>(The weather channel loves isolines!) </li></ul>
3. 6. Rules for Drawing Isolines: <ul><li>1. Isolines connect points of equal value. </li></ul> 15  5  5  15  10  10  10  10
4. 7. <ul><li>2. Isolines are gentle, curving lines- no sharp corners. </li></ul> 15  5  5  15  10  10  10  10
5. 8. <ul><li>3. Isolines are always closed curves even though the map might only show part of it. </li></ul>
6. 9. <ul><li>4. Isolines NEVER cross- this would mean that one point has two different values. Ex: one spot has two temperatures? </li></ul>20° 30 ° 40 ° 50 ° 60 °  X  Y  Z
7. 10. <ul><li>5. Isolines usually are parallel. (They have a parallel trend.) </li></ul>
8. 11. Visualizations of contour lines <ul><li>http://geology.asu.edu/~sreynolds/topo_gallery/topo_gallery.htm </li></ul>
9. 13. Gradient <ul><li>Gradient shows how quickly the value changes from one point to another. </li></ul>
10. 14. <ul><li>A steep (high) gradient changes quickly and the isolines are close together. </li></ul><ul><li>A gentle (low) gradient changes slowly and the lines are far apart. </li></ul>Steep area Gentle area
11. 15. Making Contours worksheets <ul><li>Worksheets can be printed from: </li></ul><ul><li>http://www.rcmurphy.net/Medina%202005/documents/Contours123.doc </li></ul>
12. 16. Highlight data points.
13. 17. Fill in gaps in data.
14. 18. Connect the dots.
15. 19. Go on to the next value.
16. 20. Making a Contour Map II
17. 22. Drawing Contour Maps III