Field Maps- Contour Lines-B

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Field Maps- Contour Lines-B

• Mr. Cesaire
• Martin Van Buren High School

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• Aim What types of information can we learn from
  field maps.
• Do Now Read page 15-16 Ans 28 to 30 from the
  green review book in the back.
• HW Read pages 32 to 35. Answer questions 1to 10.
• Our Final is on Wednesday October 8th.
• Marking Period ends October 10th.

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Field Maps

• Field maps are maps that give the user useful
  information about
• Temperature
• Elevation
• Concentration (Waste spills)
• Flow (ground water flow)
• Just about any type of data can be presented on
  field map.

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Field Lines

• Numerical data of equal value (Temperature,
  Elevation, Concentration) on a field map are
  connected.
• Isolines- Lines that connect points of equal
  value on a field map.

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Isotherms

• Isotherms- Lines that connect points of equal
  temperature.

http//earth.usc.edu/stott/Catalina/tempdistribut
ion.html
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Isotherms
http//earth.usc.edu/stott/Catalina/tempdistribut
ion.html
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Isotherms
http//earth.usc.edu/stott/Catalina/tempdistribut
ion.html
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Isobars
Isobars- Lines that connect points of equal value
of air pressure.
http//geography.sierra.cc.ca.us/booth/Physical/ch
p5_atm_pressure/pressure_gradient.jpg
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Contour Lines

• Contour Lines- lines that connect points of equal
  elevation.

http//academic.brooklyn.cuny.edu/geology/leveson/
core/linksa/contourlabel.html
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Contouring

• In order to connect points of equal value, you
  need to choose an interval.
• Interval- the space between two points or values.
  
• Intervals on maps can go by 10s, 20s, 50s, 100s,
  1000s, 10,000s

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Drawing Contour Lines

• Interval 10

37 33 41

47 45 48

71 67 52
40
The contour values were 40, 50, and 60. These
three values were not on the grid. But we drew
contour lines that estimated where they could be
found.
50
60
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63 64 72 72 74 80 74 70 62

65 66 73 73 78 80 75 70 64

61 63 75 80 80 80 77 72 65

69 70 78 80 85 80 76 74 62

63 70 80 83 90 80 77 72 65

64 70 74 82 85 80 78 69 69

62 70 77 80 84 80 76 70 63

63 67 72 80 82 80 76 70 62
Interval 5
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• Lets look at an example.