Read the blog post & instructions for using this system.

Geo for Google Docs is a set of tools that make it easy to use data from Google Docs Spreadsheets in TileMill, an open source map design studio.

• Export spreadsheet data to GeoJSON Any spreadsheet with geocodes (longitude and latitude coordinates) can be exported to a TileMill-ready file. After exporting, just copy the GeoJSON file to your TileMill/files/data directory.
• Geocode arbitrary addresses If your spreadsheet does not have geocodes, you can add them using a geocoding service like those provided by Yahoo PlaceFinder or MapQuest Nominatim. Consult these services for their terms of use.

• Copy the source of mapbox.js
• Open your spreadsheet and goto tools > script editor
• Replace the content in the text box with the copied source from mapbox.js
• Set the name of this script to geo
• Go to file > save and close the popup window
• Refresh your spreadsheet and you will see a new menu called Geo added after Help on the menu bar

• Dave Cole [dhcole]
• Tom MacWright [tmcw]