1. Chpt 3 Models of Earth

2. 3.1 Modeling the Planet pg 44
Maps:
Cartographers:
Projections:

3. Activity: Maps from Round Objects
3. How does the shape of the line you have drawn compare with the shape of the seam on the baseball?
4. What happens to the size and shape of areas on a globe when a map is made?
5. Why is it difficult to reproduce Earth accurately on a map?
1. What do you observe about the line on the paper?
2. How does the length of the line you have drawn compare with the length of the seam on the ball?

4. What is distortion? Map projections:
Distortion: shapes are not correct or distance is wrong
There are limitless Map projections
Depends on what map is being used for

5. 3.1 Map Projections: Partner read/notes Pgs 44-45
Mercator Projection:
Distorts:
Used for:
Picture:
Distort near pole, show true directions as straight lines
Useful for navigation
Gnomonic Projection:
Distorts land mass away from center point show shortest distance between two points
Useful for ocean/air voyages
Polyconic:
Latitude and longitude are curved, landforms have true shape/size compared to each other.
Useful for mapping large areas

6. Identifying places on Earth
How do we identify location on Earth?
What is the most common grid system used?
Read page 46, take notes on Latitude and Longitude. Draw picture of Earth with lines.

7. Latitude and Longitude
Latitude: circle from east to west.
Equator: line that separates Earth from Northern and Southern hemisphere
Longitude: run from north and south between poles
Prime meridian: Divides Eastern and Western Hemisphere
***look at
globe

8. Practice

9. Practice

10. Battleship!

11. Map Scale
Scale of map tells you how the features compare in size to Earth’s surface
Usually shown as a ratio
EX: 1 inch on map=1 mile on earth
Measure 2 inches on map, so 2 inches=2miles

12. Map Scale

13. Map Scale Examples 1 map:100,000 earth
100,000 inches= _____ feet ***12 inches=1 foot
8333 feet= _____ miles ***5280 feet=1 mile
1 inch=1.57 miles

14. Practice ***12 inches=1 foot ***5280 feet=1 mile 1 map: 250,000 earth
250,000 inches/12=20833 feet
20833 feet/5280= 3.9 miles
1: 100
1:200,000
1:50,000

16. Map Scale
Work on map scale pacing out classroom/outside

17. Practice measuring distance/scale on a map

18. Measure Distance on Map
Use map scale to find distance between two points
Look at a map, measure distance. Figure out distance on map and then distance on earth
Convert to feet or miles

19. Distance on Map 12inches=1 foot 5280 feet=1mile
1. What is the scale (ratio)?
2. Convert to miles
3. Measure the distance from Jones Tank to Bootlegger Spring.
Distance on map?
Distance on earth?
4. Measure the distance from Morman Mtn Tank to Bootlegger Spring.
Distance on map?
Distance on earth?

20. Pg 48:Take notes on plane table Draw map of courtyard
Mapmaking
Pg 48:Take notes on plane table
Draw map of courtyard
Pg: 48 Radar notes and video
Finish notes on mapmaking and technology
Traditional
First Technology
Current Technology
Plane Table:
Photographs from Airplanes:
Satellite
Radar:
GPS:
GIS:

21. Radar Radio Detection And Ranging
Radar device sends out a radio signal.
Signal bounces off an object is reflected back

22. Map Making and Technology PG: 48-51
Traditional
First Technology
Current Technology
Plane Table:
Photographs from Airplanes:
Satellite
Radar:
GPS:
GIS:

23. Satellite Orbits Earth, records data from Earth’s surface
Measure light waves
Computers convert the data to pixels (electronic dots), then usable images

24. GPS (global positioning system)
3 parts: satellites, control, user.
GPS receiver determines the time it took for signal to reach the receiver.
With different satellites signals, GPS receiver uses triangulation to compute exact location

25. GIS (Geographic Information system)
GIS is a computer system that assembles, stores, manipulates and displays data.

26. Use for technology/careers
Read pg 51---Notes on Land Surveyor
What do they do? What technology do they use?
GIS Example:
Read pg 52---get more notes on GIS
How can GIS be used to provide useful information?

27. Careers
Exploring Careers in GIS:
How is technology/GIS used? ---make list of at least 5 ways GPS/GIS is being used
What are the roles of computer and satellites in map making?

28. Help Wanted: Cartographer, Land Surveyor, Scientist, etc.
General info on what a mappers do (pg 51, 52)
Find patters and relationships, interpret gfitures and data, etc.
SKILLS: What do you need to know?
—explain GPS and GIS.
How will you be using GPS/GIS?
Use your notes, video notes, and pg 50

30. 3.2 Sec Review Page 51, #1-3 Topographic Maps
Read pg 53---notes from each paragraph

31. Topographic Maps
Shows the topography (natural and human made surface features)
Shows the shape of Earth’s surface
Scale of 1:24000
1 inch represents ___feet so shows good detail

33. Rules for contour lines
Look at WS/LAB

34. How to Read A Topographic Map
Contour Lines
Narrow lines on a map that indicate the elevation
Connect points of the same elevation
Index contour lines have the elevation written
Lines are evenly spaced, called contour interval (interval units given on map)

35. Scale and Contour Intervals

36. How to Read A Topographic Map
Slope
Distance between contour lines shows you slope
Lines far apart the landscape is flat
Lines close together it is steep
Blue Isobath lines show depths of the water
Hatchmarks point toward the center of a depression

37. Reading Contour Lines

38. Reading Contour Lines What is the contour interval?