web mapping and open source gis

Albert Decatur (albert.decatur@gmail.com)

web mapping and open source GIS

why is web mapping important?

group collaboration is more powerful than individual achievement

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draftsman’s work, 1937

many hours, one map2

OpenStreetMap, 2010

200,000 contributors, one map3

I, Pencil

I, Pencil

"No one person . . . could create from scratch a small, everyday pencil, let alone a car or an airplane."

- Leonard Read, 1958

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why is open source important?

why is open source important?

"Given enough eyeballs, all bugs are shallow."

- Eric S. Raymond, co-founder of the Open Source Initiative

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why is open source important?

free beer

why is open source important?

free speech

why is open source important?

“Think free as in free speech, not free beer.”

- Richard Stallman, founder of the Free Software Foundation

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who uses open source?

90% of supercomputers60% of internet servers30% of smart phones

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who uses open source GIS?

ESRIIDRISIERDASGooglemany others . . .

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why should you use it?

portabledependablefree

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make a heatmap of Wikipedia article word length

demo: Wikipedia in Hawaii

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demo: Wikipedia in Hawaii

Let’s see this in action:1. Run a script2. Run commands on the

output3. Add to a server4. Display from the server

make a heatmap of Wikipedia article word length15

demo: Wikipedia in Hawaii

script to retrieve georeferenced Wikipedia articles, their abstracts, and word count 16

demo: Wikipedia in Hawaii

heatmap of Wikipedia article word length17

demo: Wikipedia in Hawaii

we will use these18

on to the demo . . .