1. Aim: How do we construct a field map?
Do Now: Describe a time yourself or a family member needed to use a GPS.

2. How can we match the same types of symbols?

3. Identify the different types of field maps.
3. Contour (Contour or topographic map) – connects points of equal elevation
Isotherms (Temperature Map)- connects points of equal temperature
2. Isobars (Air Pressure Map) – connects points of equal air pressure
Isolines- lines that connect points of equal value
Interval – change in value from one line to the next line

4. How do we draw ioslines for a field map?
How do we determine the possible temperature value of points W, X, Y, and Z?
120
100 80 60 40 20
Isotherm Interval: 20ºC Z X
120ºC
70ºC
10ºC
60ºC W Y

5. Connect the points of equal temperature
Connect the points of equal temperature. Determine the possible temperature for points A,B, & C ? 69
WEST
WALL
EAST
NORTH WALL
SOUTH WALL 68 66 67 65 64 63 62 B C A
61.5ºC
64.5ºC
68.5ºC
Isotherm Interval: 1ºC

6. How is this isotherm map different from the previous map?
How do we determine the temperature range of points X, Y, and Z? 40 20
Isotherm Interval: 20ºC
1ºC to 19ºC Z
21ºC to 39ºC Y X
1ºC to 19ºC

7. Connect the points of equal temperature
Connect the points of equal temperature. Determine the possible temperature ranges for points R, S, T, U.
Isotherm Interval: 10ºC 50 S R T 60 70 80 40 U
51ºC to 59ºC
61ºC to 69ºC
41ºC to 49ºC
31ºC to 39ºC

8. Extra Summary Question
Summary Field Maps
The field map to the left shows air temperature measurements, in degrees Celsius, taken at the same elevation within a closed classroom. Draw the 20ºC, 22ºC, and 24ºC isotherm lines.
Extra Summary Question
40ºF
50ºF
The weather map to the right shows the air temperature recorded at the same time at cities across the United States. Correctly draw the 40ºF and 50ºF isotherm lines.

9. Extra Summary Questions
How can we connect points of equal value?
How are field maps different from one another? Why?
How are isotherm lines drawn on a map?
How are isobar lines drawn on a map?
Identify two rules when drawing isolines on a field map?
How is the contour interval be determined?

10. Connect the points of equal temperature of 63°C, 65°C, 67°C, and 69°C
Connect the points of equal temperature of 63°C, 65°C, 67°C, and 69°C. Determine the possible temperature for points A,B, & C ? 69
WEST
WALL
EAST
NORTH WALL
SOUTH WALL 68 66 67 65 64 63 62 B C A
64. 5ºC
63ºC
68.5ºC
Isotherm Interval: 1ºC

11. Connect each same number with a line Lines cannot cross or touch
10.
20.
30.
40.

12. Match each symbol with a line but the lines cannot cross or touch each other.

13. How do we draw ioslines for a field map?
How do we determine the possible temperature value of points W, X, Y, and Z?
120
100 80 60 40 20
Isotherm Interval: 20ºC Z X W Y

14. How do we draw ioslines for a field map?
How do we determine the possible temperature value of points W, X, Y, and Z?
120
100 80 60 40 20
Isotherm Interval: 20ºC Z X W Y