The other day, I needed to draw a symmetrical object (a map point icon) in Inkscape, the wonderful free vector graphics editor. I was surprised to find that there is no symmetrical modeling feature, so I improvised. Here’s how to create a symmetrical polygon in…

It seems that everyone who analyzes historical NextBus data has a different way of archiving their data. There are lots of ways one can use GIS to analyze this data, from creating movies showing the pulse of the transit system, to analyzing on-time performance…

The QGIS instructions for building from source are targeted at Ubuntu, but they translate fairly well to Fedora. Here’s a quick guide:

Instead of preparing apt as they say, use yum or Package Manager to install these packages: