Brief Introduction to GIS

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What is GIS?

• Geographical Information Systems

A method to visualize, manipulate,

analyze, and display spatial data

3 Population Changes 1990-2000

4 States which gained a seat (or two) after the 2000 census

5 States which lost a House seat (or two) after the 2000 Census

6 Reapportionment after the 2000 Census

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2000 Presidential vote by state

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1996

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1992

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Using ArcGIS

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Click on ArcCatalog (cabinet file-shaped icon) or Add Data (black cross

with yellow background) to import data.

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ArcCatalog (cabinet file-shaped icon) contains a lot of different kinds of

data. Additional data may be stored on the university’s GIS server.

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Changing layer orders 1) Counties

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Changing layer orders 2) Congressional Districts

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Changing layer orders 3) Census tract boundaries

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Displaying Data using “Symbology”

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Presidential Vote 2004 by County