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Fields & Isolines

Fields & Isolines. Field : region of space which there is a Measurable quantity of a given property at every point. EXAMPLES : AIR TEMP AIR PRESSURE ELAVATION RAIN FALL VOLCANIC ASH FALL. Maps of Fields have: 1. SCALE : showing relative size of model.

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Fields & Isolines

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  1. Fields & Isolines

  2. Field: region of space which there is a Measurable quantity of a given property at every point.

  3. EXAMPLES: AIR TEMP AIR PRESSURE ELAVATION RAIN FALL VOLCANIC ASH FALL

  4. Maps of Fields have: 1. SCALE: showing relative size of model

  5. 2. Isolines: lines connecting points of the equal value in the field points may be measured or interpolated.

  6. Examples of isolines: • Isotherms: • points of equal temperature • Isobars: • points of equal barometric (air) pressure • Contours: • points of equal altitude • Concentration of chemicals • Anything else you can get a value for. • (The weather channel loves isolines!)

  7. 3. Interval: spacing between isolines.

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

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

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

  11. 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

  12. Isolines NEVER cross

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

  14. Highlight data points.

  15. Fill in gaps in data.

  16. Connect the dots.

  17. An isoline needs to be drawn for every interval. • If the interval is 20 meters, then you draw an isoline every 20 meters. • If the interval is 4isobars, then you draw an isoline every 4isobars. • You do NOT draw a line for any amount other then the interval amount.

  18. Go on to the next value. The interval will be 10 degrees

  19. Making a Contour Map II

  20. Drawing Contour Maps III

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

  22. 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

  23. 1. CLOSELY spaced = steep gradient, rapid change 2. WIDELY spaced = gentle gradient, slow change

  24. Time to practice….

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