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Crowd Sourced Geodata

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#1
Crackfigure

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The rise of crowd sourcing has really spawned various applications in Geospatial technologies. I was looking into harnessing that information to perform some geospatial analysis using ArcGIS spatial statistics.

Could somone give me an idea of how to do that? let me explain....

This week in DC we had a snowstorm that gridlocked our highways. it had such an impact that there were reports of people taking up to 13 hours to get home! The most interesting part is that many people tweeted about their commutes and had their geotag metadata attached. I want to take that information and create density corridors to see where the worst commutes were.

How do i get that data? I see many twitter maps being made all of the time. How is it done? Any help would be appreciated.

Thom

#2
dsl

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You have to access Twitter's api to obtain the public streams. You can do a search if you know the hashtags for that time period. But unfortunately you are probably too late to do it yourself, because you can only search up to a couple of days. At least that's how it used to be. You are also limited to how many calls you can make to their servers.

http://apiwiki.twitt...54648/FrontPage

Your only hope otherwise is if someone collected those Tweets and provides them. I've seen infochimps provide some Twitter collections.

Hope that helps,
David

#3
Crackfigure

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You have to access Twitter's api to obtain the public streams. You can do a search if you know the hashtags for that time period. But unfortunately you are probably too late to do it yourself, because you can only search up to a couple of days. At least that's how it used to be. You are also limited to how many calls you can make to their servers.

http://apiwiki.twitt...54648/FrontPage

Your only hope otherwise is if someone collected those Tweets and provides them. I've seen infochimps provide some Twitter collections.

Hope that helps,
David


Thanks Dave-
I suspected this may be it. Hopefully I'll be able to figure it out.

Thom

#4
dsl

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Apparently I'm a bit behind the times. The library of congress is supposedly archiving twitter. Maybe you can find the tweets you're looking for through them.

http://blogs.loc.gov...twitter-an-faq/

Cheers,
David




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