Strk's Blog

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’s what it looks like: Edges of the built topology At a first glance it doesn’t seem to be particularly problematic. Here’s the composition summary: =# select topologysummary('small_sample_topo'); topologysummary -------------------------------------------------------- Topology small_sample_topo (2042), SRID 0, precision 0 83 nodes, 156 edges, 74 faces, 0 topogeoms in 0 layers But the devil hides at high zoom levels.

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’s a fact, so let’s see if I can relief some pain by sharing what I know or learn as I crawl the learning curve myself. Yesterday I’ve met with Markus Neteler and he was complaining about being unable to checkout the release branch of QuantumGIS without filling up his laptop hard drive.