Project 5 Thematic Maps - Pennsylvania State University
Project 5 Thematic Maps Aaron Henning & Carl Sherlock Thematic Maps Basics Transfer geographic data into geographic information Highlight one attributes geographic distribution Single purpose or theme in mind Review: Reference maps portray many
attributes and features Reference vs. Thematic Thematic Maps Use abstract, graphic symbols that represent the quantities and qualities that make locations meaningful The use of colors and symbols to project attribute data Attribute data examples: density, counts, rates, etc. Cynthia Brewers presentation
Remember Thematic Mapping Counts Showing a symbol for each individual or group of individuals Fails when many individuals or groups are present and/or when location is unknown
Thematic Mapping Porportional Maps Symbol Also called graduated symbol maps They represent classes of counts not individual counts
Useful for counts that lack location Thematic Mapping Chloropleth place & value Involves coloring geographic areas to represent categories of rates or densities Most common type of thematic map
Thematic Mapping Pie Chart Rates and densities Simply one count divided by another count In densities, the divisor is the magnitude of a
geographic area Can be in various formats Bar Graph Starting the Project Go to factfinder.census.go v Left side menu, hover cursor over
DATA SETS Click on Decennial Census Making sure you are selecting Census 2000 Summary File 1, choose Thematic Maps on right hand menu
Select county under geographic type Select your state, then select your county, and hit Next This will display all of the data themes that can be displayed on a map pick one and click Show Result
Directly above map where it says Display map by:, select Census Tract from dropdown menu Adjust zoom and pan to make data as visible as
possible At top of left side menu under Change, select data classes From here you can change classing method, color
scheme, and number of classes Classing Methods Review Quantile (percentile) Equal number of features in each class Equal Interval Equal range of values in each class
Natural Breaks Divides features and/or range of values according to preexisting groupings or divisions When finished customizing, right click map and select Save picture as... (repeat for
legend) You have now successfully found and downloaded all data for your first map For this project, you need a total of 3 maps At
least one needs to be of ACS Data From FactFinder homepage, hover over Data Sets and click on American Community Survey and follow same process Take
a moment to analyze your map why is the data how it is? Why does the tract that corresponds to campus and downtown have the lowest percent of
persons under 18? Think about this, it will help you with the write-u Map 1: Percent Persons Under 18 Years of Age Finding Map Scale In bottom left corner of your map image, it will tell you distance across (Dg)
The actual width of the image is ~6 (Dm) Remember formula? S = D m / Dg the Review Thematic Mapping
Attribute data transformed into useful geographic information Designed with a central purpose or theme Different types of data are represented in different ways References
Baxter, Ryan. Census Mapping and Thematic Maps. GEOG 121 Lecture. 11/20/06 Brewer, Cynthia. Cartographic Inspirations for Designing Better Data Visualizations. GEOG 121 Guest Presentation. 10/11/06 Census Bureau FactFinder. Accessed 11/20/06. http://factfinder.census.gov ESRI Virtual Campus: Module 6. Accessed 11/19/06. http://training.esri.com The Pennsylvanian Marketing and Planning Center. Accessed 11/20/06. http://www.mapcenter.org/index.html Help Aaron
Henning [email protected] Carl Sherlock [email protected] http://www.personal.psu.edu/cfs5000/geog121_lab5.html Course Example http://www.geog.psu.edu/courses/geog121/projects/proj5_exampl e.html
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