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	<title>Strk&#039;s Blog &#187; GIS</title>
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	<link>http://strk.keybit.net/blog</link>
	<description>Free Thoughts</description>
	<lastBuildDate>Fri, 08 Mar 2013 09:05:44 +0000</lastBuildDate>
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		<title>On the fly simplification of topologically defined geometries</title>
		<link>http://strk.keybit.net/blog/2013/03/08/on-the-fly-simplification-of-topologically-defined-geometries/</link>
		<comments>http://strk.keybit.net/blog/2013/03/08/on-the-fly-simplification-of-topologically-defined-geometries/#comments</comments>
		<pubDate>Fri, 08 Mar 2013 09:05:44 +0000</pubDate>
		<dc:creator>strk</dc:creator>
				<category><![CDATA[Free Software]]></category>
		<category><![CDATA[GIS]]></category>
		<category><![CDATA[postgis]]></category>
		<category><![CDATA[topology]]></category>

		<guid isPermaLink="false">http://strk.keybit.net/blog/?p=418</guid>
		<description><![CDATA[Keeping GIS data in full-resolution and simplifying it on demand is a known challenge: simplification has to be fast and its output has to be topologically consistent. We saw how to get a topologically consistent simplified version of a full layer, but that method isn&#8217;t fast enough for on-demand usage. Also, we saw how to [...]]]></description>
		<wfw:commentRss>http://strk.keybit.net/blog/2013/03/08/on-the-fly-simplification-of-topologically-defined-geometries/feed/</wfw:commentRss>
		<slash:comments>3</slash:comments>
		</item>
		<item>
		<title>GEOS 3.3.4 released</title>
		<link>http://strk.keybit.net/blog/2012/05/31/geos-3-3-4-released/</link>
		<comments>http://strk.keybit.net/blog/2012/05/31/geos-3-3-4-released/#comments</comments>
		<pubDate>Thu, 31 May 2012 19:25:57 +0000</pubDate>
		<dc:creator>strk</dc:creator>
				<category><![CDATA[GIS]]></category>
		<category><![CDATA[geos]]></category>
		<category><![CDATA[topology]]></category>

		<guid isPermaLink="false">http://strk.keybit.net/blog/?p=399</guid>
		<description><![CDATA[New bug fix and improvement release for the 3.3 series of GEOS is out. Changes since 3.3.3: Do not abort on NaN overlay input (#530) Reduce CommonBitsRemover harmful effects during overlay op (#527) Better cross-compiler support (#534) Enable overlay ops short-circuits (#542) Envelope-based short-circuit for symDifference (#543) Fix support for PHP 5.4 (#513) Fix TopologyPreservingSimplifier [...]]]></description>
		<wfw:commentRss>http://strk.keybit.net/blog/2012/05/31/geos-3-3-4-released/feed/</wfw:commentRss>
		<slash:comments>2</slash:comments>
		</item>
		<item>
		<title>Simplifying a map layer using PostGIS topology</title>
		<link>http://strk.keybit.net/blog/2012/04/13/simplifying-a-map-layer-using-postgis-topology/</link>
		<comments>http://strk.keybit.net/blog/2012/04/13/simplifying-a-map-layer-using-postgis-topology/#comments</comments>
		<pubDate>Fri, 13 Apr 2012 12:30:42 +0000</pubDate>
		<dc:creator>strk</dc:creator>
				<category><![CDATA[Free Software]]></category>
		<category><![CDATA[GIS]]></category>
		<category><![CDATA[postgis]]></category>
		<category><![CDATA[topology]]></category>

		<guid isPermaLink="false">http://strk.keybit.net/blog/?p=364</guid>
		<description><![CDATA[Following a recent research about how to simplify a multipolygon layer while keeping topological relationships intact, here&#8217;s my take on that, using the PostGIS topological support. The data French administrative subdivisions, called &#8220;départements&#8221;, will be used. Data can be downloaded here. It is composed by 96 multipolygons for a total of  47036 vertices. Principle of [...]]]></description>
		<wfw:commentRss>http://strk.keybit.net/blog/2012/04/13/simplifying-a-map-layer-using-postgis-topology/feed/</wfw:commentRss>
		<slash:comments>17</slash:comments>
		</item>
		<item>
		<title>PostGIS 2.0.0 released</title>
		<link>http://strk.keybit.net/blog/2012/04/04/postgis-2-0-0-released/</link>
		<comments>http://strk.keybit.net/blog/2012/04/04/postgis-2-0-0-released/#comments</comments>
		<pubDate>Wed, 04 Apr 2012 09:46:16 +0000</pubDate>
		<dc:creator>strk</dc:creator>
				<category><![CDATA[Free Software]]></category>
		<category><![CDATA[GIS]]></category>
		<category><![CDATA[cartodb]]></category>
		<category><![CDATA[geos]]></category>
		<category><![CDATA[postgis]]></category>
		<category><![CDATA[topology]]></category>

		<guid isPermaLink="false">http://strk.keybit.net/blog/?p=341</guid>
		<description><![CDATA[The long-awaited full featured PostGIS 2.0.0 is finally out. Coupled with GEOS 3.3.3 (released a few days before) and GDAL-1.9.0, it brings you the best spatial database system in town, complete with raster analysis and topology modeling support. Complete announcement, with list of changes,  here. It&#8217;s been an great pleasure to work with the rest [...]]]></description>
		<wfw:commentRss>http://strk.keybit.net/blog/2012/04/04/postgis-2-0-0-released/feed/</wfw:commentRss>
		<slash:comments>2</slash:comments>
		</item>
		<item>
		<title>A walk on the wild side</title>
		<link>http://strk.keybit.net/blog/2012/01/28/a-walk-on-the-wild-side/</link>
		<comments>http://strk.keybit.net/blog/2012/01/28/a-walk-on-the-wild-side/#comments</comments>
		<pubDate>Sat, 28 Jan 2012 00:03:20 +0000</pubDate>
		<dc:creator>strk</dc:creator>
				<category><![CDATA[Free Software]]></category>
		<category><![CDATA[GIS]]></category>
		<category><![CDATA[postgis]]></category>
		<category><![CDATA[topology]]></category>

		<guid isPermaLink="false">http://strk.keybit.net/blog/?p=330</guid>
		<description><![CDATA[How topology starts making sense in PostGIS 2.0.0]]></description>
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		<slash:comments>1</slash:comments>
		</item>
		<item>
		<title>GEOS 3.3.2 released</title>
		<link>http://strk.keybit.net/blog/2012/01/06/geos-3-3-2-released/</link>
		<comments>http://strk.keybit.net/blog/2012/01/06/geos-3-3-2-released/#comments</comments>
		<pubDate>Fri, 06 Jan 2012 21:12:04 +0000</pubDate>
		<dc:creator>strk</dc:creator>
				<category><![CDATA[Free Software]]></category>
		<category><![CDATA[GIS]]></category>
		<category><![CDATA[geos]]></category>
		<category><![CDATA[postgis]]></category>
		<category><![CDATA[topology]]></category>

		<guid isPermaLink="false">http://strk.keybit.net/blog/?p=327</guid>
		<description><![CDATA[The second bugfix release in the 3.3 branch of GEOS was released today. This is the version required by the topology support shipped with the upcoming PostGIS 2.0 release. Everyone is recommended to upgrade. Changes can be read here, package can be downloaded here.]]></description>
		<wfw:commentRss>http://strk.keybit.net/blog/2012/01/06/geos-3-3-2-released/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Topology cleaning with PostGIS</title>
		<link>http://strk.keybit.net/blog/2011/11/21/topology-cleaning-with-postgis/</link>
		<comments>http://strk.keybit.net/blog/2011/11/21/topology-cleaning-with-postgis/#comments</comments>
		<pubDate>Mon, 21 Nov 2011 17:51:37 +0000</pubDate>
		<dc:creator>strk</dc:creator>
				<category><![CDATA[Free Software]]></category>
		<category><![CDATA[GIS]]></category>
		<category><![CDATA[postgis]]></category>
		<category><![CDATA[qgis]]></category>
		<category><![CDATA[topology]]></category>

		<guid isPermaLink="false">http://strk.keybit.net/blog/?p=309</guid>
		<description><![CDATA[An early tester of the new PostGIS Topology submitted an interesting dataset which kept me busy for a couple of weeks fixing a bunch of bugs related to numerical stability/robustness. Finally, the ST_CreateTopoGeo function succeeded and imported the dataset as a proper topological schema. Here&#8217;s what it looks like: At a first glance it doesn&#8217;t [...]]]></description>
		<wfw:commentRss>http://strk.keybit.net/blog/2011/11/21/topology-cleaning-with-postgis/feed/</wfw:commentRss>
		<slash:comments>1</slash:comments>
		</item>
		<item>
		<title>PostGIS topology ISO SQL/MM complete</title>
		<link>http://strk.keybit.net/blog/2011/10/14/postgis-topology-iso-sqlmm-complete/</link>
		<comments>http://strk.keybit.net/blog/2011/10/14/postgis-topology-iso-sqlmm-complete/#comments</comments>
		<pubDate>Fri, 14 Oct 2011 13:39:10 +0000</pubDate>
		<dc:creator>strk</dc:creator>
				<category><![CDATA[Free Software]]></category>
		<category><![CDATA[GIS]]></category>
		<category><![CDATA[postgis]]></category>
		<category><![CDATA[topology]]></category>

		<guid isPermaLink="false">http://strk.keybit.net/blog/?p=223</guid>
		<description><![CDATA[PostGIS implementation of the ISO SQL/MM Topology-Geometry model is finally complete. The SQL/MM model is just a portion of the whole topology support, but an important one, including schema definition and functions to create and populate the schema with primitive components (nodes, edges, faces). In addition to the base model, PostGIS adds a TopoGeometry data [...]]]></description>
		<wfw:commentRss>http://strk.keybit.net/blog/2011/10/14/postgis-topology-iso-sqlmm-complete/feed/</wfw:commentRss>
		<slash:comments>12</slash:comments>
		</item>
		<item>
		<title>GEOS 3.3.1 released</title>
		<link>http://strk.keybit.net/blog/2011/09/27/geos-3-3-1-released/</link>
		<comments>http://strk.keybit.net/blog/2011/09/27/geos-3-3-1-released/#comments</comments>
		<pubDate>Tue, 27 Sep 2011 16:44:22 +0000</pubDate>
		<dc:creator>strk</dc:creator>
				<category><![CDATA[Free Software]]></category>
		<category><![CDATA[GIS]]></category>
		<category><![CDATA[geos]]></category>

		<guid isPermaLink="false">http://strk.keybit.net/blog/?p=210</guid>
		<description><![CDATA[The first bugfix release in the 3.3 branch of GEOS was released today. Anyone running 3.3.0 is recommended to upgrade. Changes can be read here, package can be downloaded here. By the way&#8230; did you try the PHP binding yet ? Configure with --enable-php to take a look !]]></description>
		<wfw:commentRss>http://strk.keybit.net/blog/2011/09/27/geos-3-3-1-released/feed/</wfw:commentRss>
		<slash:comments>1</slash:comments>
		</item>
		<item>
		<title>Getting just the tip of a remote git branch</title>
		<link>http://strk.keybit.net/blog/2011/06/07/getting-just-the-tip-of-a-remote-git-branch/</link>
		<comments>http://strk.keybit.net/blog/2011/06/07/getting-just-the-tip-of-a-remote-git-branch/#comments</comments>
		<pubDate>Tue, 07 Jun 2011 16:50:11 +0000</pubDate>
		<dc:creator>strk</dc:creator>
				<category><![CDATA[Free Software]]></category>
		<category><![CDATA[GIS]]></category>
		<category><![CDATA[git]]></category>
		<category><![CDATA[qgis]]></category>

		<guid isPermaLink="false">http://strk.keybit.net/blog/?p=164</guid>
		<description><![CDATA[As projects move their code under git control, people get frustrated about being unable to do most basic operations they are used to perform with SVN or CVS. That&#8217;s a fact, so let&#8217;s see if I can relief some pain by sharing what I know or learn as I crawl the learning curve myself. Yesterday [...]]]></description>
		<wfw:commentRss>http://strk.keybit.net/blog/2011/06/07/getting-just-the-tip-of-a-remote-git-branch/feed/</wfw:commentRss>
		<slash:comments>1</slash:comments>
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