August 20, 2013. Agenda Review HW Maps Lie Types of Map Identification Work on HW. EQ- Can maps be trusted?. Table of Contents: 12. Projections and Types of Maps 13. HW Charts 14. Ch1 Questions #18-24. HW: - PowerPoint PPT Presentation
August 20, 2013 Agenda 1.Review HW 2.Maps Lie 3.Types of Map Identification 4.Work on HW EQ- Can maps be trusted? Table of Contents: 12. Projections and Types of Maps 13. HW Charts 14. Ch1 Questions #18-24 HW: 1.Create a chart that identifies the definition and an example of toponym, site, situation, and mathematical location. 2. Read pages 15-20 and answer questions 18-24. 3.Create a chart that identifies the definition and an example of formal, functional and vernacular regions.
Transcript
August 20, 2013Agenda1.Review HW2.Maps Lie3.Types of Map Identification4.Work on HW
EQ- Can maps be trusted?
Table of Contents:12. Projections and Types of Maps13. HW Charts14. Ch1 Questions #18-24
HW:1.Create a chart that identifies the definition and an example of toponym, site, situation, and mathematical location.2. Read pages 15-20 and answer questions 18-24.3.Create a chart that identifies the definition and an example of formal, functional and vernacular regions.
Because the world is a sphere and maps are flat, there will always be some degree of distortion. The next several slides will display some of the more popular distortions.
Projection- method of transferring locations on the Earth’s surface
Types of Distortion:1.Shape2.Distance3.Relative Size4.Direction
Mercator Projection
Good for showing accurate shape, polar areas much larger than real life
Peters Projection
Shows shape and size accurately but distorts locationAdvertised as the non-racist map
Plate Carree Projection
Distorts shape and size
Robinson Projection
Size is accurate but distance and direction are distorted
Sinusoidal Projection
Size is accurate but shape and direction are distorted
Mollweide Projection
Sizes are good relative to each other, some shape distortion“Equal Area Projection”
Proportion used in legend may be misleading
Propaganda Maps- maps that lie with a political
purpose
German map pre-WWII to show the threat of Czech bombers
CIA Map of Afghanistan, 1982
Dot Maps
Use a concentration of dots to show locale of specific characteristic
Isoline Maps
Proportional Symbol
US Population
Shape gets larger depending on concentration
Choropleth Map
Color shading to show
degree of concentration
Using your text books, atlases and the post-it notes, locate and
“label” one map of each type. Show these to me for a grade
when complete!
Displaying the same geographical features at various scales may also depict misleading results.
Total Number of African-Americans in each State1951 - 112460112461 - 300130300131 - 778035778036 - 14563231456324 - 2859055
900 0 900 1800 Miles
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EW
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Continental United States
This map shows the total number of African-Americans per state. Examine Georgia.
Number of African-Americans per County0 - 47914792 - 1219412195 - 2424124242 - 8260882609 - 324008
100 0 100 200 Miles
N
EW
S
GeorgiaIn the previous slide, Georgia had one of the highest number of African-Americans, but a closer look tells a different picture. The dark red is the Atlanta metropolitan area.
Using Census Tracts of the Atlanta Metropolitan Area, a different scale gives different results.
Percentage of African-Americans in Atlanta Metropolitan Area-99-99 - 13.5813.58 - 38.6638.66 - 75.175.1 - 99.76
30 0 30 60 Miles
N
EW
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Atlanta Metropolitan Area Census Tracts
Data may also distort desired results. The following slides show how population of a particular cohort may be misleading.
Percentage of African-Americans within each County0 - 0.0540.054 - 0.1670.167 - 0.3140.314 - 0.5050.505 - 0.936
1000 0 1000 2000 Miles
N
EW
S
Continental United States
This map shows the percentage of African-Americans living within counties across the US.
Total Number of African-Americans in each County0 - 1943119432 - 7748877489 - 230425230426 - 631936631937 - 1317147
1000 0 1000 2000 Miles
N
EW
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Continental United States
This map shows the total number of African-Americans living in each county across the US.
These four New York counties (New York, Kings, Queens, and Bronx) have a combined African-American population of 2,121,882 and outnumbers the total number of African-Americans in the entire state of Texas 2,021,632
Percentage of Hispanic Total in the US0% - 0.3%0.3% - 0.7%0.7% - 1.9%1.9% - 4%4% - 9.9%9.9% - 19.4%19.4% - 34.4%
Percentage of HispanicsA similar comparison can be made with Hispanics living in the US. This map shows the total percentage of Hispanics in each county.
Number of Hispanics0 - 4122341224 - 183465183466 - 462411462412 - 953407953408 - 3351242
Total Number of Hispanics This map displays the total number of Hispanics in each US county.
These three Southern California counties (Los Angeles, Orange, and San Diego) have a total Hispanic population of 5,045,726 which is greater than the total Hispanic population of Texas at 4,339,905. New Mexico has the greatest percentage of Hispanics (33%), it’s total Hispanic population is 579,224.
US Population
The map below shows the US population divided into Natural Breaks. In this case, the natural breaks are near the 7,000,000 mark.
US Population
This map shows US population in Quintiles. In this map, states are classified into five separate categories based on population. The dark red represents the states in the top one-fifth. The total population in each state has not changed; however, the way that it is classified has changed.
