Lecture 3 How does GIS work. How does GIS work? Maps are stored in computers Databases and Tables...
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Transcript of Lecture 3 How does GIS work. How does GIS work? Maps are stored in computers Databases and Tables...
How does GIS work?Categories of reality are divided into layers
Countries, States, Cities
Parcels of land ownership
Roads, Rivers, Lakes, Buildings
ZIP codes
How does GIS work?Layers are made up of points, lines, or polygons
Cities – points
Roads – lines
Counties – polygons
Levels of geography Country State County City
DEMO
http://www.marshallco.org/www/maps/images/50seregexpl.jpg
Levels of geography ZIP code
http://cssr.berkeley.edu/cwscmsreports/maps/showEntriesCountymap.asp?page=Ora
GIS links attribute and spatial data Each layer has a database table Each map feature has one record in the table The table has attributes about the features
GIS Power Just a database Tools Analysis GIS Science and Geography Geo Statistics Aids in decision making
Remember “Maps Communicate”
Which 8% of 7000 stores to close?
http://money.cnn.com/news/specials/storysupplement/starbucks_closings/CA.html
5 steps to GIS analysis Frame the question Get the data Choose analysis method Process the data Look at the results
Frame the question Where can we put a garbage dump?
Not on bad soil Out of the city Not in a park Not in a protected area like a forest More?
Check out other similar projects
http://www.ruralgis.org/conference/2004proceedings/thurs/session4/thurs_4_1_00.pdf