fields and isolines !!!! we’re going to learn about isolines…isn’t that awesome??? whatever,...
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Fields and Isolines !!!!We’re going to learn about Isolines…isn’t
that awesome???Whatever, just be quiet and learn.
Fields – WRITE THIS DOWN in your notes sheet!!Field – a region of space in which there is a
MEASUREABLE quantity of a given property at every point
Examples: Temperature, Pressure, Elevation, etc.The strength of a field varies (Ex. Whoever smelt
it..)The farther away from the source, the weaker the
fieldFields can be MAPPED by placing measurements
on paper and connecting locations with EQUAL readings with figures called ISOLINES!!!
IsolinesWhat the heck IS an isoline, anyway?An isoline is a line connecting points of
equal value.
Examples of isolines: Isotherms:
points of equal temperature
Isobar:
points of equal barometric (air) pressure
Contour:
points of equal altitude
Concentration of chemicals
Anything else you can get a value for.
(The weather channel loves isolines!)
Rules for drawing them!How do you do it?Here’s how!! Once you learn this, you’ll be
experts.
1. Isolines connect points of equal value.
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5 5
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2. Isolines are gentle, curving lines- no sharp corners.
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3. Isolines should always form closed curves (loops) even though the map might only show part of it.
So, at times you may have to extend a line to the edge of the map!
4. Isolines NEVER cross- this would mean that one point has two different values. Ex: one spot has two temperatures?
That’s whack!
20°
30 °
40 ° 50 ° 60 °
X
YZ
5. Isolines usually are parallel. (They have a parallel trend, and usually follow the same pattern.)
More on Isolines!!6) Isolines are drawn according to a
designated isoline intervalOn a map, they are called the CONTOUR
INTERVAL7) Isolines should ALWAYS be drawn in
pencilIt’s easy to make mistakes, so you might have
to do some heavy duty erasing.Stop whining.
Visualizations of contour lineshttp://geology.asu.edu/~sreynolds/topo_galle
ry/topo_gallery.htm
Use your ESRT to write the equation For Gradient on your notes sheet!
What is Gradient?Gradient shows how quickly the value
changes from one point to another.
Anything else you should know?Actually, yes. You see…sometimes isolines are REALLY
close togetherOther times, they are kind of far apartDoes this mean something?You bet!
How can you tell whether a gradient is steep or gentle?
A steep (high) gradient changes quickly and the isolines are close together.
A gentle (low) gradient changes slowly and the lines are far apart.
Steep area
Gentle area
OK Let’s practice.We are going to do some isoline practice nowTake out that isoline packet I handed out at
the beginning of the period.Hurry!Ok, here we go.
Highlight data points.
Fill in gaps in data.
Connect the dots.
Go on to the next value.
Drawing Isolines II
Drawing Isolines III
