Measuring Earth

Measuring Earth

Do Now• Think of a way to organize the numbers on

your table

Isolines = lines that connect points of equal values. (iso = equal)

The “values” can be anything… temp, pressure, elevation, etc

Isoline Rules1. Isolines connect points of equal value.

2. Isolines are gentle, curving lines - no sharp corners.

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5 5

1510

10 10

10

Isoline Rules

3. Isolines are always closed curves, even though the map might only show part of it.

Isoline Rules

4. Isolines NEVER cross - this would mean that one point has two different values.

50 ° 60 °

X

Y

Z

40 °

30 °

20°

Are maps 2D or 3D?

Is the world 2D or 3D?

So how can we know about 3D figures using 2D maps?

Physical MapsTopographic Maps

http://www.youtube.com/watch?v=SymUFSwEm3c

Turning 3D into 2D: Topographic Maps

1. Cut sheets of paper in half, hot-dog-style.2. Fold one end of paper over other end in uneven way to make a cone.3. Tape cones on inside, so students can write on outside....more on next page.

Turning 3D into 2D: Topographic Maps

1. Draw circles around your mountain every 1 inch.

2. 2. Add elevations to your mountain (1 inch = 10 ft).

3. Look at the mountain from the top. Draw the rings you see in your notebook. Add elevations to the lines of your drawing (1 inch = 10 feet).

Your Mountains:

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What do What do hachuredhachured

lines show?lines show?

What are the rules concerning

hachured lines?

Practice!

The elevation of Albany is 282 feet. The elevation at Binghamton is 1634 feet. Calculate the gradient to the nearest tenth

of a ft/mi. Show all work.

gradient = change in elevation distance

= 1634-282 115 miles

= 1352 ft 115 miles

= 11.8 ft/mile

The elevation of Watertown is 99m. The elevation at Oswego is 144m.

Calculate the gradient to the nearest tenthof a m/km. Show all work.

gradient = change in elevation distance

= 144 - 99 75 km

= 45 m 75 km

= 0.6 m/km

If the distance between the two

circled cities is 425 km, calculate the temperature

gradient to the nearesthundredth?

Show all work.

gradient = change in temperature distance

= 82-48 425

= 34 425

= 0.08 °F/km

Do Now• Draw a map with the following features

– At least 5 contour lines– Label all lines– Contour interval of 20– A stream flowing east– 1 mountain

What are the steps to draw a

topographic profileplace a piece of paper between the

pointsmark where every contour line touches the edge of the paper

determine the elevation of each mark

place the paper on the graph and mark theelevation of each contour line

Using the map and chart below, Using the map and chart below, construct a topographic map profile.construct a topographic map profile.

Please match the contour map on the left with the profile on the right.