Topic: Mapping Fields

Fields –

Think of a football field

The numbers represent distance

to goal

What is the distance to the goal at this point?

What is the distance to the goal at this point?

Isoline

Isoline "iso-" means "equal."

Isoline -

Types of Isolines Isotherm – Isobars – Contour Lines –

Rules for drawing Isolines1) __2) ___Example:

•13°C

•13°C •13°C

•11°C •11°C

•11°C

3) __

•5

•2

•3

•3

•2

•1

•4

4) ___

•12°C

•11°C•12°C

•13°C•12°C

•13°C

Example:

Wrong Way

5) ___

•10°C

•9°C •9°C

•10°C•10°C

Off the diagram

•10°C

•9°C

•9°C

•9°C

•9°C

•10°C

Loop

Working with Isotherms

Campfire

Where is it the warmest?

Source Sink

Source –

Sink –

Source SinkFlows from source to sink

Heat Source (high temperatures)

Heat Sink (low temperature)

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

.90°F

.87°F.89°F

.90°F

.90°F

.86°F

.88°F

.87°F

.86°F

.86°F

Let’s look at actual temperatures Draw isolines at a 2°F Intervals

.86°F

.82°F

.84°F

.86°F

.86°F .84°F

.85°F .83°F

.80°F

.81°F

Heat Source Heat Sink

Where is the heat source?

Gradient

Change in field value between two place.

Gradient = Change in Field Value Distance

Yes, take out your ESRT now and find the formula

•90°F

•85°F

•85°F

•80°F

Distance = 5m

Remember the Formula

Gradient = Change in Field Value

Distance

Remember the Formula

Gradient = 90-80 =

5m

Remember the Formula

Gradient = 10 = 2°F/m

5m

Compare gradient Formula to Rate of Change Formula

FQ:

What is wrong with the isolines below?

•10°C

•9°C •9°C

•10°C•10°C

•Final Question