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Symbolize Pie Charts

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Bobby Sudekum

17 Aug, 2011 07:08 PM

My task at hand is to create a map with pie charts at given points. The pie charts are simple and have 2 categories. I have a point shapefile, but I am wondering if there is any available script to create 2 category pie charts at each point.

Thanks for the help
Bobby

1. Support Staff 2 Posted by Tom MacWright on 18 Aug, 2011 07:56 PM

   

   Hey Bobby,

   Currently there's not much in terms of premade scripts to do this task - in the past, we've generated many pie charts up-front - with filenames like pie-20-80.png for a pie chart with 20% and 80% distribution. But, yeah, unfortunately this'll still require the manual work.

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2. 3 Posted by Bobby S on 18 Aug, 2011 08:56 PM

   

   Bummer, well I guess I might try symbolizing the data in other ways as I have way too many points to make a unique png for each city.

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3. Support Staff 4 Posted by Will White on 21 Aug, 2011 01:54 AM

   

   Bobby,
   Here's a blog post about how we scripted the creation of SVG pie charts using Inkscape. I'm not sure how dated the material is, but it might lead you to a solution.

   http://developmentseed.org/blog/2010/jan/05/adding-pie-charts-map-t...

   Will

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4. Support Staff 5 Posted by Tom MacWright on 29 Aug, 2011 08:02 PM

   

   Closing this for now - we'll be working on better symbolizer support in Mapnik upstream, and integrating that into TileMill. Let us know if you run into any problems with your approach.

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5. Tom MacWright closed this discussion on 29 Aug, 2011 08:02 PM.

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