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heatmaps for Google Maps

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# Update: Google Maps now has [native support for heatmaps](https://developers.google.com/maps/documentation/javascript/heatmaplayer). Go use that.

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Google Maps gives you [API](http://code.google.com/apis/maps/documentation/reference.html#GTileLayerOverlay) for adding additional map layers. This software implements a map tile server for a heatmap layer.

![](http://static.whit537.org/2008/heatmap-0.2.png)

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## Gheat for ...

<a href="http://code.google.com/p/gheat-ae/">Gheat for App Engine</a>

<a href="http://code.google.com/p/gheat/downloads/list">Gheat for Aspen (*original version*)</a>

<a href="http://sixpak.org/vince/source/gheat/">Gheat for CGI (Apache, MongoDB)</a>

<a href="http://github.com/robertrv/django-gheat">Gheat for Django</a>

<a href="http://jjguy.com/heatmap/">Gheat for Google Earth (and offline use in general)</a>

<a href="http://www.codeproject.com/KB/web-image/GHeat_Net.aspx">Gheat for .NET</a>

<a href="http://github.com/amccollum/pyheat">Gheat for OpenGL and !CherryPy</a>

<a href="https://github.com/bigkraig/pylons_gheat">Gheat for Pylons</a>

<a href="https://github.com/varunpant/GHEAT-JAVA">Gheat for Java</a>

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## Competitors

http://www.heatmaptool.com/

http://www.heatmapapi.com/

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## Examples

Please tell me (chad@zetaweb.com) if you'd like a link here.

<a href="http://earth911.com/">Earth911</a> uses gheat to show <a href="http://labs.earth911.com/heatmap/">real-time recycling searches</a>.

<a href="http://benosteen.wordpress.com/">Ben O'Steen</a> made a <a href="http://benosteen.wordpress.com/2011/07/26/student-property-heatmap/">student property heatmap</a>.

<a href="http://www.tada.com/">Tada</a> is using pylons_gheat to <a href="http://heatmap.tada.com/">visualize sales</a>.

<a href="http://www.wheredoyougo.net/">Where Do You Go</a> is using gheat-ae to visualize !FourSquare checkins.

<a href="http://www.numberinvestigator.com/">!NumberInvestigator</a> is using gheat (with portions ported to PHP) to generate <a href="http://trends.numberinvestigator.com/">hourly maps of telemarketing victims</a>.

<a href="http://www.colorofchange.org/">Color of Change</a> used gheat to visualize <a href="http://stories.colorofchange.org/">stories of what Obama's election meant to voters</a> and how they participated in the campaign.

<a href="http://vistrac.com/">!VisTrac</a> is using gheat to visualize <a href="http://vistrac.com/account/clicks/July-2009">clicks on web pages</a>.

<a href="http://vort.org/">Russell Neches</a> is using gheat to visualize <a href="http://vort.org/media/data/crashes.html">auto and bike accidents in Davis, CA</a>. The data is parsed from about 10,000 raw police reports.

<a href="http://kurage.kilo.jp/heat">Yvan Girard</a> is using gheat to show Twitter activity in and around Tokyo.

<a href="http://www.honeynet.org.au/">The Australian Honeynet Project</a> is using gheat to visualize the <a href="http://www.honeynet.org.au/?q=node/41">origin of spam that gets caught in their SensorNET honeypots</a>.

<a href="http://www.confickerworkinggroup.org/">The Conficker Working Group</a> is using gheat to track the <a href="http://www.confickerworkinggroup.org/wiki/pmwiki.php/ANY/InfectionDistribution">spread of the Conficker worm</a>.

This is an animated heatmap of the conficker botnet as found in Australia (one frame a day, unique IPs per frame, with data from the end of January through June, 2009). This was produced using a heavily modified gheat. Here's <a href="http://geoip.arpatubes.net/conficker/">a Flash example</a>.

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## <a href="http://www.zetadev.com/software/gheat/0.2/__/doc/html/">Full Documentation</a>

## How it Works

This is a standalone web app that responds to URLs of the form

```
/<color_scheme>/<zoom>/<x>,<y>.png
```

with 256px by 256px images like this:

![tile](http://static.whit537.org/2008/4,6-again.png)

You tell Google Maps (via their API) to place these images over your embedded map. The images are increasingly transparent as the zoom level increases, so they make a nice overlay.

----

## Dependencies

* [Python 2.5](http://www.python.org/) (needs sqlite)
  * [Pygame 1.8.1](http://www.pygame.org/) or [PIL](http://www.pythonware.com/products/pil/)
  * [Aspen 0.8](http://www.zetadev.com/software/aspen/) (Python webserver)

## A Word about Backends

* Pygame is three or four times faster than PIL.
  * Pygame is three or four times harder to install than PIL.
  * [Get Gheat working](http://www.zetadev.com/software/gheat/0.2/__/doc/html/installation.html) with PIL first, then install Pygame.
  * You need Pygame 1.8.1 (saving to PNG was [ broken in 1.8.0](http://pygame.motherhamster.org/bugzilla/show_bug.cgi?id=13))
  * You need to install [numpy](http://numpy.scipy.org/) before you can use Pygame.

## Links

* **[Documentation](http://www.zetadev.com/software/gheat/0.2/__/doc/html/)**
  * [Screencast](http://blag.whit537.org/2008/04/gheat-02-pygame-pretty-colors.html)
  * [Ruby starting-point](http://blog.corunet.com/english/the-definitive-heatmap)  (thanks David :^)
  * [other software from Zeta](http://www.zetadev.com/software/)

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