2. Map Projection • Date:
Monday September 24 of 2012
• Session:
23
Look at the picture on the board and answer:
Bell Ringer
What do you think are
the differences
between these maps?
Talk with your partner
about the meaning of
“Projection”
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End

3. Objectives Students will learn the different map
projections.
Agenda • Bell Ringer
• Objectives
• Map making problems
State Standard 8.4.6
By the end of eighth
• Types of projection
grade, students
improve their skills in
will
• Mercator projection
historical research and
geographical analysis. • Closure

4. WHAT IF YOUR HEAD WOULD BE A
PLANET…
• What part of your
head would be
water and what
would be land?
• How would you do
a map of this new
planet?

5. Map-making problems
• One of the problems
map-makers encounter
is that the globe is a
sphere and maps are
two-dimensional.
• There are a variety of
"projections" used to
represent the globe in
two dimensions.

6. Map projections
• Project a round globe onto a flat surface
• Options?
• Stretch out some areas
• Cut out some areas
• Shrink some areas

7. Types of projection (By surface)

8. Cylindrical
projection

9. Conic Projection

10. Plane Projection

11. Interrupted Projection

12. Map projections
• Three properties to consider
– Area (equal-area or equivalent)
– Shape (conformal)
– Distance (equidistant)
– Choose two out of three
• How large an area?
• Purpose of the map
• Ulterior motives?

13. Cylindrical Projection MERCATOR
• The Mercator
projection
exaggerates areas
far from the
equator
Alaska takes as much
area on the map as
Brazil, when Brazil's
area is nearly 5 times
that of Alaska.

14. Notice that areas close to the equator have very little distortion.
However, the closer to the poles that one travels, the more distorted
the map

15. • http://youtu.be/X4wgFSHZXBg

16. Cylindrical Projection – Gall-Peters
• Useful for
political
maps, it
shows the
true area of
land
masses, choos
ing instead to
distort their
shape

17. Pseudocylindrical map projection
Mollweide
• it sacrifices accuracy of angle and shape in
favor of accurate proportions in area

18. Conic Projection
• A conic projection
map is created by
placing a cone
shaped screen on a
globe. The resulting
projection is more
accurate than the
cylindrical
projection map
discussed above.

19. Conic Projection
• However, the
further we
travel down the
map, the more
distorted and
less accurate
the map
becomes. It’s
used by pilots

20. Plane Projection
• A plane projection is
created by placing an
imaginary screen
directly above or
below a globe. The
image that would
result is called a
plane projection.
This type of map
projection is not
commonly used.

21. Interrupted Projection
• There are many different types of interrupted projection
maps. These types of maps try to depict the continents as
accurately as possible by leaving blank space in the less
important areas of the map, such as in the oceans.

22. Closure
• http://youtu.be/a6dF7hZpH-A