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I want to develop a heat map (standardized choropleth map) which will be auto-updated with data pulled from GoogleDocs. Which tools are the most helpful for developing that kind of map?

Thank you.

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I think you're looking for Google Fusion Tables - There's an API – Roy Jul 23 '12 at 11:21
@Roy I am not sure that the fusion tables can be auto-updated (or even edited). Perhaps CartoDB would work? – David LeBauer Jun 25 '13 at 16:01

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