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Where can I download real time data for traffic and weather? I'd like to use it as an overlay on a mapping service of my choice (eg. Google maps, OpenLayers etc.)

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There is not one source for what you are requesting. –  Mapperz Apr 17 '13 at 19:06
    
Weather can be retrieved from wunderground.com/weather/api/d/pricing.html –  Mapperz Apr 17 '13 at 19:08
    
you are likely going to want streamed data so you always have the latest for each. Unless you want a point in time. in which case archived data for this scope of area is going to be even harder to find. –  Brad Nesom Apr 17 '13 at 19:15
    
In addition, are you looking for historical or live data? –  dassouki Apr 19 '13 at 11:31
    
I am ok with historical as well as real time data. –  priyank Apr 19 '13 at 19:04

1 Answer 1

Parse (using python/etc) RSS feeds from local authorities. Tough, but free.

It's a bit of work up front, but then you can write the data directly into your own feature classes, and reserve yourself. Kind of like ESRI's new geoEvent processor Server extension, but all custom through python. I update my services every hour - so far so good. I pull about 500 stations every run, and preprocess a feature class with rss urls/ids linked to points.

Note: You mention 'for the world' - yikes - you may want to select the top 50 cities or so to begin!

eg http://rss.weather.com/weather/rss/local/USNY0996?cm_ven=LWO&cm_cat=rss&par=LWO_rss

Make sure they don't change their format!

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