Heatmap and other tools for Google Maps.
https://developers.google.com/maps/documentation/javascript/visualization
Mapping
Get access to data on 8,187 websites Google Visualization Library Customers. We know of 4,957 live websites using Google Visualization Library and an additional 3,230 sites that used Google Visualization Library historically and 2,864 websites in the United States.
Get a list of 8,187 websites using Google Visualization Library which includes location information, hosting data, contact details, 4,957 currently live websites and an additional 13,830 domains that redirect to sites in this list. 3,230 sites that used this technology previouslyand 2,864 websites in the United States currently using Google Visualization Library.
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