1. Topic: Mapping Fields

2. Fields –

3. Think of a football field
What is the distance to the goal at this point?
Isoline
What is the distance to the goal at this point?
The numbers represent distance to goal

4. Isoline "iso-" means "equal."

5. Types of Isolines
Isotherm –
Isobars –
Contour Lines –

6. Rules for drawing Isolines__
___
Example:
13°C
13°C
13°C
11°C
11°C
11°C

7. 3) __ 5 3 4 3 1 2 2

8. 4) ___
Example:
12°C
13°C
13°C
12°C
12°C
11°C
Wrong Way

9. 5) ___ 9°C 9°C 10°C 10°C 10°C 10°C 10°C 9°C 9°C 9°C 9°C
Off the diagram
Loop

10. Working with Isotherms
Where is it the warmest?
Source
Sink
Campfire

11. -------------------->
Source –
Sink –
Source Sink
>
Flows from source to sink
Heat Source (high temperatures)
Heat Sink (low temperature)

12. Let’s look at actual temperatures Draw Isolines at a 1°F Intervals

13. Let’s look at actual temperatures Draw isolines at a 2°F Intervals
Heat Sink
Heat Source
.82°F
.86°F
.84°F
.80°F
Where is the heat source?

14. Gradient = Change in Field Value
Change in field value between two place.
Gradient = Change in Field Value
Distance

15. Yes, take out your ESRT now and find the formula

16. 90°F 85°F 85°F 80°F Distance = 5m Remember the Formula
Gradient = 10 = 2°F/m 5m
Remember the Formula
Gradient = = 5m
Remember the Formula
Gradient = Change in Field Value
Distance

17. Compare gradient Formula to Rate of Change Formula

18. What is wrong with the isolines below?
FQ:
What is wrong with the isolines below?
Final Question
10°C
10°C
10°C
9°C
9°C