measuring earth. do now think of a way to organize the numbers on your table
TRANSCRIPT
Isolines = lines that connect points of equal values. (iso = equal)
The “values” can be anything… temp, pressure, elevation, etc
Isolines = lines that connect points of equal values. (iso = equal)
The “values” can be anything… temp, pressure, elevation, etc
Isoline RulesIsoline Rules
1. Isolines connect points of equal value.
2. Isolines are gentle, curving lines - no sharp corners.
15
5 5
1510
10 10
10
Isoline RulesIsoline Rules
3. Isolines are always closed curves, even though the map might only show part of it.
Isoline RulesIsoline Rules
4. Isolines NEVER cross - this would mean that one point has two different values.
50 ° 60 °
X
Y
Z
40 °
30 °
20°
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).
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 NowDo 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 profile
place a piece of paper between the points
mark 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.