Field Maps- Contour Lines-B

Mr. Cesaire

Martin Van Buren High School

• 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.

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.

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.

Isotherms• Isotherms- Lines that connect points of

equal temperature. http://earth.usc.edu/~stott/Catalina/tempdistribution.html

Isothermshttp://earth.usc.edu/~stott/Catalina/tempdistribution.html

Isothermshttp://earth.usc.edu/~stott/Catalina/tempdistribution.html

Isobars

Isobars- Lines that connect points of equal value of air pressure.

http://geography.sierra.cc.ca.us/booth/Physical/chp5_atm_pressure/pressure_gradient.jpg

Contour Lines• Contour Lines- lines that connect points

of equal elevation.

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

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

Drawing Contour Lines

• Interval = 10

37 33 41

47 45 48

71 67 52

40

50

60

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.

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

• Let’s look at an example….