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    <p>I intend to do something similar for all the counties in US and so I have collected some information that might be of use to you. Here's the overall approach.</p> <ol> <li>Collect the data like list of counties each with it's FIPS id, display name and svg map. This information is in <a href="http://commons.wikimedia.org/wiki/File:Blank_Map_of_Arizona.svg" rel="nofollow noreferrer">public domain</a>. Like the blank SVG map of Arizona shown below.</li> </ol> <p><img src="https://i.stack.imgur.com/IVmPt.png" alt="svg map of arizona"></p> <ol start="2"> <li><p>Store all this data by county id in a database like MySQL or whatever you fancy. Add the data pertaining to schools. Now you can export the subset of data to a csv file for Analysis. I prefer using R. Once you have your map and data ready, proceed to the next step.</p></li> <li><p>You can overlay this data on the map using Raphael as shown in <a href="http://jebruner.com/2011/11/how-to-build-an-interactive-map-with-open-source-tools/" rel="nofollow noreferrer">this article</a> </p></li> </ol> <p>or </p> <p>Use this open source JQuery <a href="http://newsignature.github.io/us-map/" rel="nofollow noreferrer">plugin</a> and customize it to create your own clickable heatmap.</p> <p>Let me know how you progress and we can bounce some ideas.</p> <p>EDIT: Here's another <a href="http://flowingdata.com/2009/11/12/how-to-make-a-us-county-thematic-map-using-free-tools/#more-3581" rel="nofollow noreferrer">nice article</a> how to make a Choropleth using free tools. This look slike the best approach to make what you are going after. It uses Python so it should be neat and clean.</p>
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