Heat Map is a geographical presentation of data in numerical values by using colors,and is widely used for different purposes, like population density, sales turnover by regions, working capacity for each state,etc. We just found a heat map about the current affordability of housing in England and you can click the image for details.
Since there are increasing queries about creating interactive heat map, we have prepared a sample map about creating a HTML5 heat map showcasing the distribution of hotels in California.
You can also create a heat map for any topics (e.g. sales distribution, distribution of telecommunication services, sources of materials) regarding to the video.