TIGER/Line and BIL Parser
One sleepless night I wanted to hack up a few visuals of the SF Bay Area, so I built parsers for the US Census data and the USGS elevation files. They ended up being useful for other projects such as 93 Photo Street and the SF Bike Map.
These maps use the US Census TIGER/Line maps from the 108th Congressional District 2000 TIGER/Line Files as well as USGS National Elevation Data BIL files generated from their (now defunct) National Map Seamless Data Distribution System.
Elevation BIL renders
TIGER/Line chain renders
New York City: