Date Tue 28 September 2010

Carson Farmer (of manageR fame :-) this week submitted a patch for QGIS for evaluation. His patch adds three more class breaks strategies for graduated symbology in vector data: Pretty, Jenks (Natural Breaks) and StdDev. He explains the rationale behind this patch in his blog post here. I really like this new functionality (which should make its way into trunk soon). I made a couple of screen shots that will make it easier to visualise the different classifiers he has created:

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What's nice about the Jenks and Pretty breaks is that they create much more humanistic value ranges - it's easier to identify with a value range of 6450000 - 11100000 than it is for something like 15394734.4297 - 20055646.2193


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