Mapping movements in Manhattan

This is just amazing:

This is Manhattan in the evening via Twitter GPS traces.  He tracks people’s location over 4 hour periods and the lines represent their movements.  Movements go from blue to red, so longer trails and more red means people are more on the move.  I love the evening picture above.  If you go to Jeff Clark’s website you get the day broken down into chunks, and a thorough explanation of how he did it.

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