Catoctin Mountain Park Trail Names

I want to talk about how to name the trails in Catoctin Mountain Park, a US national park in Maryland. The available information about trail names...

On Tracing from Poor Imagery

I came across this section of an Interstate today: Notice how the Interstate looks a little like it’s been draped across the terrain’s ridges an...

Python Tile Expiration Class

I have periodically needed a memory-efficient way to track tile expirations, so I wrote something to do it. Here, I make it available in case it c...

Mapnik and loaded icons

I’m posting mostly because the repetition will help me remember it, because I keep getting bitten by this. Mapnik appears to cache images loaded b...