Simon Willison’s Weblog

Blogmarks tagged mapping, css

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How to Make a US County Thematic Map Using Free Tools. This is the trick I’ve been using to generate choropleths at the Guardian for the past year: figure out the preferred colours for a set of data in a Python script and then rewrite an SVG file to colour in the areas. I use ElementTree rather than BeautifulSoup but the technique is exactly the same. The best thing about SVG is that our graphics department can export them directly out of Illustrator, with named layers and paths automatically becoming SVG ID attributes. Bonus tip: sometimes you don’t have to rewrite the SVG XML at all, instead you can generate CSS to colour areas by ID selector and inject it in to the top of the file. # 12th November 2009, 10:49 am

cascadenik: cascading sheets of style for mapnik. Great idea. Mapnik (the open source tile rendering system used by OpenStreetMap and others) has a complex style configuration based on XML. Michal Migurski has build a CSS-style equivalent which compiles down to XML, hopefully making it much quicker and easier to get started with Mapnik customisation. # 30th August 2008, 10:04 am