Ask HN: how do I trace routes in a geospatial db?

I had an idea for a little app that would make my friends' lives a little better. I live in a location with street parking, if you know where to park (and when the rules apply; e.g., you can park in commercial zones on Sundays, etc.)

I would like to build dataset of the streets near me with the different parking areas noted.

The problem is that I'm not sure where to begin. I'd like to be able to build something pretty easily in a weekend, and would prefer to not rely on google maps or other hosted solutions.

Any help is appreciated, thanks.