1. Field Maps- Contour Lines-B
Mr. Cesaire
Martin Van Buren High School

2. Aim: What types of information can we learn from field maps.
Do Now: Read page 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.

3. 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.

4. 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.

5. Isotherms Isotherms- Lines that connect points of equal temperature.

6.
Isotherms

7.
Isotherms

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

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

10. 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

11. Drawing Contour Lines Interval = 10 4037 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

13. 63 64 72 74 80 70 62 65 66 73 78 75 61 77 69 85 76 83 90 82 84 67
Interval = 5

14. Let’s look at an example….