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	<title>vis4.net &#187; Blog</title>
	<link>http://vis4.net</link>
	<description>The geeky side of information visualization</description>
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		<title>Let&#039;s Keep Symbol Maps Clean And Tidy</title>
		<description><![CDATA[In his great blog The Daily Viz Matt Stiles recently posted this map of US crime rates. The map shows murder rates in different cities as bubble symbols and it strongly reminded me to write about the problem of overlapping map symbols. To illustrate the core of this problem, I remade Matts map but used transparent symbols. Click [...]]]></description>
		<link>http://vis4.net/blog/posts/clean-your-symbol-maps/?piwik_campaign=rss&#038;piwik_kwd=3391</link>
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		<title>How To Avoid Equidistant HSV Colors</title>
		<description><![CDATA[As some of you pointed out in the comments of my last post, taking equidistant colors in the HSV color space is no solution for finding a set of colors that are perceived as equidistant. This post describes what's wrong with HSV and what we can do about this. Note that since this post contains [...]]]></description>
		<link>http://vis4.net/blog/posts/avoid-equidistant-hsv-colors/?piwik_campaign=rss&#038;piwik_kwd=3199</link>
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		<title>Take Care of your Choropleth Maps</title>
		<description><![CDATA[Over the last week I had some fun playing with choropleth maps. Thereby I analyzed the following US poverty map, which was recently published at the Guardian data blog: To be honest, the first time I saw this map I didn't thought much about it. Ok, poverty is highest in south central of the United [...]]]></description>
		<link>http://vis4.net/blog/posts/choropleth-maps/?piwik_campaign=rss&#038;piwik_kwd=3114</link>
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		<title>Saying Goodbye to Red-Green Color Scales</title>
		<description><![CDATA[I used to love them, but it's over now: diverging red-green color scales. I bet the reason for the popularity of red-green color scales is that they are so easy to interpret (at least in my culture). Green means good, red means bad. For instance, the above map shows the income of private households for [...]]]></description>
		<link>http://vis4.net/blog/posts/goodbye-redgreen-scales/?piwik_campaign=rss&#038;piwik_kwd=3098</link>
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		<title>Matching Regions of GeoIP and Natural Earth</title>
		<description><![CDATA[In this post I'll describe the process of bringing together the region shapes from the Natural Earth dataset with the regions provided in the GeoCityLite database. In the GeoCityLite db, the regions are referenced by a two-letter ID (FIPS10-4 for some countries, ISO3366-2 for others). Initially I thought that those IDs would be same as [...]]]></description>
		<link>http://vis4.net/blog/posts/piwik-matching-regions/?piwik_campaign=rss&#038;piwik_kwd=2939</link>
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		<title>Rendering SVG Country Maps in Python</title>
		<description><![CDATA[In this post I will explain the rendering process of the Piwik country maps. The results will basically look like this: Getting the viewport The first step of drawing a map is to define the viewport, which is a rectangle containing the geometry that will be visible in each map. To simplify things a lot, [...]]]></description>
		<link>http://vis4.net/blog/posts/rendering_country_maps/?piwik_campaign=rss&#038;piwik_kwd=3020</link>
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		<title>Visualizing the Global Digital Divide By Mapping Internet And Population</title>
		<description><![CDATA[With this map I tried to visualize the global digital divide. It shows more than 80,000 populated places in blue and about 350,000 locations of IP addresses in red. White dots indicate places where many people live and many IP addresses are available. The IP address locations are taken from the GeoLiteCity database by MaxMind. [...]]]></description>
		<link>http://vis4.net/blog/posts/mapping-internet-and-population/?piwik_campaign=rss&#038;piwik_kwd=2927</link>
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		<title>Facebook And Its Impact In Connecting People</title>
		<description><![CDATA[You probably remember this map of Facebook friendships, which made it's way through the web in December 2010. In this related article, the creator and Facebook intern Paul Butler explains the process of rendering the map. The most interesting remark he made can be found in the last sentence: It's not just a pretty picture, [...]]]></description>
		<link>http://vis4.net/blog/posts/facebook-internet/?piwik_campaign=rss&#038;piwik_kwd=2899</link>
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		<title>Moving on with the Piwik Maps</title>
		<description><![CDATA[Here's a short documentation of my current progress in re-creating the Piwik maps in SVG/JS. Since we're going to create at least one pre-generated map source file per country, file size is going to be an important issue. That's why we thought about removing all polygons whose area is below a certain threshold, say 10 [...]]]></description>
		<link>http://vis4.net/blog/posts/moving-on-with-the-piwik-maps/?piwik_campaign=rss&#038;piwik_kwd=2874</link>
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		<title>Transforming a Processing Sketch to HTML5</title>
		<description><![CDATA[More for exercising than for competition reasons, I recently recreated a great Processing visualization by Ben Fry using HTML5. I had the strong feeling that the kind of animation is totally doable without plugins like Java and Flash. This post sums up what I learned. Initially I wanted to use the relatively new PaperJS library [...]]]></description>
		<link>http://vis4.net/blog/posts/transforming-a-processing-sketch-to-html5/?piwik_campaign=rss&#038;piwik_kwd=2844</link>
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