In the category of moderately new features in WordPress, I really appreciate the new WordPress Country Stats, with the nice touch of flags of the nations, and a map. As an inveterate map snob, however, the map drives me crazy: Why? Because choropleth maps are bad for showing count data, unless all the polygons are the same size. Look at the map above– France and … Continue reading WordPress Country Stats, a cartographers complaint
I recently gave a talk on a really interesting project I’m working on, and in the process of talking to a non-technical crowd introduced Open Source using some of my favorite (borrowed) phrases, i.e. “Free not as in free beer, but free as in freedom, free as in ‘free puppy’”, which resulting in a surprisingly satisfying chuckle from the audience. What’s great about the project … Continue reading Independence– Free as in Freedom
Just pretty pictures today. Continue reading Cartographically Pleasing Vegetation Boundaries– with PovRay, PostGIS, and LiDAR
I can’t remember if I posted on this, but there is a cool demo of a GeoExt multipage print here: http://dev.geoext.org/sandbox/pgiraud/playground/print-multipage/geoext.ux/ux/MultiPagePrint/examples/MultiPagePrint.html Definitely an interface for advanced users, but nice nonetheless. Continue reading GeoExt/Mapfish MultiPage Prints
Leadership vs. Power: Off topic here a bit. I think this post will end up categorized as “other”… . A while back I met a fellow we’ll call Bob, who has spent a long time in the tech world, implementing, for example, some of the first closed circuit TVs for video feeds at a statehouse in the 1970s. As he tells the story, the closed … Continue reading Quick narrative on the distinction between leadership and power… .
A while back, I had a (somewhat cryptic) post on OGC services and security. A couple months later, I saw this post on GeoSolution’s site on GeoServer security and the ins and outs of various options, from native to proxied security. It is quite a bit more nuanced than my own… . I recommend you read it, even if you don’t use GeoServer– it is … Continue reading #OGC Web Services and #Security
In a further exploration of using PovRay to do fast calculation of Voronoi polygons, let’s look to a real stream system as an example. Here’s where the magic comes out, and where medial axes are found. Here’s the povray code: Continue reading Fast Calculation of Voronoi Polygons in PovRay– Applied
Yet further abuse to follow in the application of PovRay for spatial analyses– be forwarned… . Calculating Voronoi polygons is a useful tool for calculating the initial approximation of a medial axis. We densify the vertices on the polygon for which we want a medial axis, and then calculate Voronoi polygons on said vertices. I’ll confess– I’ve been using ArcGIS for this step. There. I … Continue reading Fast Calculation of Voronoi Polygons in PovRay
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