Working with Line Maps, the Google Places API, and R
A frequent challenge of visualization is behind the scenes, to get the data and to mold it into the format you need. Do that. Then map.
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How to Untangle a Spaghetti Line Chart (with R Examples)
Put multiple time series lines on the same plot, and you quickly end up with a mess. Here are practical ways to clean it up.
Getting Started with D3.js