Map Projections and Map Scale

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description

Map Projections and Map Scale. All Maps Lie. 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. Types of Thematic Maps. Dot Maps. Isoline Maps. Choropleth maps. - PowerPoint PPT Presentation

Transcript of Map Projections and Map Scale

Page 1: Map Projections and Map Scale
Page 2: Map Projections and Map Scale

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.

Page 3: Map Projections and Map Scale

Mercator Projection

Page 4: Map Projections and Map Scale

Peters Projection

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Plate Carree Projection

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Robinson Projection

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Sinusoidal Projection

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Mollweide Projection

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Page 10: Map Projections and Map Scale

Dot Maps

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Isoline Maps

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Choropleth maps

Page 13: Map Projections and Map Scale

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Proportional Symbol

US Population

Page 14: Map Projections and Map Scale

Displaying the same geographical features at various scales may also depict misleading results.

Page 15: Map Projections and Map Scale

Total Number of African-Americans in each State1951 - 112460112461 - 300130300131 - 778035778036 - 14563231456324 - 2859055

900 0 900 1800 Miles

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Continental United States

This map shows the total number of African-Americans per state. Examine Georgia.

Page 16: Map Projections and Map Scale

Number of African-Americans per County0 - 47914792 - 1219412195 - 2424124242 - 8260882609 - 324008

100 0 100 200 Miles

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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.

Page 17: Map Projections and Map Scale

Percentage of African-Americans-99-99 - 13.5813.58 - 38.6638.66 - 75.175.1 - 99.76

Counties.shp

States.shp

60 0 60 120 Miles

Metropolitan Counties of Atlanta

Using Census Tracts of the Atlanta Metropolitan Area, a different scale gives different results.

Page 18: Map Projections and Map Scale

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

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Atlanta Metropolitan Area Census Tracts

Page 19: Map Projections and Map Scale

Data may also distort desired results. The following slides show how population of a particular cohort may be misleading.

Page 20: Map Projections and Map Scale

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

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Continental United States

This map shows the percentage of African-Americans living within counties across the US.

Page 21: Map Projections and Map Scale

Total Number of African-Americans in each County0 - 1943119432 - 7748877489 - 230425230426 - 631936631937 - 1317147

1000 0 1000 2000 Miles

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Continental United States

This map shows the total number of African-Americans living in each county across the US.

Page 22: Map Projections and Map Scale

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

Page 23: Map Projections and Map Scale

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%

900 0 900 1800 Miles

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EW

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Hispanic Population by Percentage of US Total

Page 24: Map Projections and Map Scale

Percentage of Hispanics0 - 0.0470.047 - 0.1460.146 - 0.2960.296 - 0.5220.522 - 0.927

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.

Page 25: Map Projections and Map Scale

Number of Hispanics0 - 4122341224 - 183465183466 - 462411462412 - 953407953408 - 3351242

Total Number of Hispanics This map displays the total number of Hispanics in each US county.

Page 26: Map Projections and Map Scale

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.

Page 27: Map Projections and Map Scale

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.

Page 28: Map Projections and Map Scale

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.

Page 29: Map Projections and Map Scale

Natural Breaks

Quintile


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