Recently I needed to show a heat map of a quite a lot of coor­di­nate points for a little project of mine that ended up in a data visu­al­iza­tion con­test (that unfor­tu­nately I didn’t win, even though I made to the final­ists). The idea was to show the dis­tri­b­u­tion of the geo­ref­er­enced wikipedia pages through a heat map, so when I first heard about open​heatmap.com I knew it was the tool to use. Open​HeatMap.com is an excel­lent project by Pete Warden that takes a dataset as a CSV, Excel or Google Spread­sheet file and con­vert it to a nice, brows­able heat map pre­sen­ta­tion.
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