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	<title>Volunteered Geographic Information</title>
	<link>http://danieljlewis.org</link>
	<description>A Geography/GIS blog by Daniel J Lewis</description>
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		<title>Generalising OS MasterMap Buildings</title>
		<description><![CDATA[The purpose of map generalisation is to represent spatial data in a way that makes it possible to effectively view the data at scales smaller than that for which it was originally intended. In the case of the Ordnance Survey&#8217;s MasterMap product you have data at an incredibly fine level of spatial resolution, which is [...]]]></description>
		<link>http://danieljlewis.org/2011/12/20/generalising-os-mastermap-buildings/</link>
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		<title>Thomas Pynchon&#8217;s Entropy</title>
		<description><![CDATA[The concept of entropy has arisen periodically during the course of my PhD study, both as an analog to thermodynamics operationalised by Alan Wilson in his &#8216;family&#8217; of spatial interaction models and to Shannon&#8217;s entropy as formalised spatially by several scholars including Mike Batty. Alan Wilson&#8217;s models of urban systems work because modelling an entropy [...]]]></description>
		<link>http://danieljlewis.org/2011/09/13/thomas-pynchons-entropy/</link>
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		<title>Weighted Mean Direction Surfaces in Python</title>
		<description><![CDATA[I work a lot with flows and spatial interactions, one thing that I&#8217;ve wanted to do for a while is compute a mean flow direction surface. Unfortunately, arithmetic means don&#8217;t work for angular data, this is because it cannot account for the circular nature of the distribution of angular measurements. For instance the angles 5 [...]]]></description>
		<link>http://danieljlewis.org/2011/08/31/weighted-mean-direction-surfaces-in-python/</link>
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		<title>A Spatial Approach to Location Quotients</title>
		<description><![CDATA[The intent of this post is not simply to uncover where the highest density of people belonging to a particular ethnic group are, but rather to use the ‘location quotient’ (LQ) technique to compare the ethnic density in any one area to the overall ethnic density in Southwark, thus providing a relative insight into where [...]]]></description>
		<link>http://danieljlewis.org/2011/06/17/a-spatial-approach-to-location-quotients-2/</link>
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		<title>Network Population Density for Southwark</title>
		<description><![CDATA[Using the excellent SANET extension for ArcGIS 9.3 I was able to take some of my data for Southwark that I had geocoded to address level, and estimate the population density using the OS Mastermap ITN product. The procedure is essentially a Kernel Density Estimation that takes place on a given network rather than across 2D space, this effectively controls [...]]]></description>
		<link>http://danieljlewis.org/2011/05/03/network-population-density-for-southwark/</link>
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		<title>&#8216;Compactness&#8217; in Zoning: the circle as the ideal.</title>
		<description><![CDATA[I saw a thought provoking presentation recently, given by Wenwen Li of the University of California Santa Barbara, the talk was a wide ranging insight into Cyber Infrastructure, its uses for geospatial information, and some of the computational techniques that underpinned the project. One element of the project involved zone design for the greater Los [...]]]></description>
		<link>http://danieljlewis.org/2011/02/26/compactness-in-zoning-the-circle-as-the-ideal/</link>
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		<title>Mapping Spatial Entropy in Southwark</title>
		<description><![CDATA[I&#8217;ve been doing a bit of work recently on segregation with Pablo Mateos, and having gone through the motions with aspatial indices of segregation (the classics): dissimilarity, exposure and so on, I decided to investigate the more explicitly spatial ones. Taking a lead from Reardon and O&#8217;Sullivan&#8217;s (2004) paper &#8220;Measures of Spatial Segregation&#8221; in sociological methodology, I [...]]]></description>
		<link>http://danieljlewis.org/2011/02/03/mapping-spatial-entropy-in-southwark/</link>
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		<title>Spatial Design for GP Consortia?</title>
		<description><![CDATA[The government is set to release a bill detailing how it is they expect the proposed GP Consortia to work. GP Consortia, groups of GPs working together, are set to replace the current structure of Primary Care Trusts (PCTs) and Strategic Health Authorities (SHAs) as the mechanism through which primary healthcare is provided to the [...]]]></description>
		<link>http://danieljlewis.org/2011/01/18/spatial-design-for-gp-consortia/</link>
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		<title>Frozen Britain and No Central Heating?</title>
		<description><![CDATA[I liked Ben Hennig&#8217;s population cartogram of the UK under snow, but I thought it could perhaps show something a little more serious than simply where the people are. To do this I went to the UK Census 2001 (I know, an old data source, but the only thing I was aware of that could [...]]]></description>
		<link>http://danieljlewis.org/2010/12/20/frozen-britain-and-no-central-heating/</link>
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		<title>Representing Populations: a Spatial Ecology</title>
		<description><![CDATA[A subtitle to this post might also be: Are we all being mislead by the New York Times? In stating this I am referring to the recent maps released by the New York Times looking at ethnic distributions from the US Census Bureau&#8217;s American Community Survey. The most immediate thing we can learn about this [...]]]></description>
		<link>http://danieljlewis.org/2010/12/20/representing-populations-a-spatial-ecology/</link>
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