This Google Map displays 5000 crimes in San Francisco almost instantly on a Google Map. The map was created with the Google Maps API and the Dotter.js, a javascript class that generates data URIs.
The crimes displayed were committed in San Francisco between the 25th April and 25th May 2011. What is really impressive about the map is how quickly the 5000 data points load on the map.
If you want to create your own super-fast map with thousands of data points then the Dotter.js class is available on Github
Dotter Example - San Francisco Crime Map
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