In one of my SotM 2011 talks, I suggested that OSM
should have regular extracts of metropolitan areas for major world cities and
their surrounding areas, regardless of state or country. This is a repository
for a bit of code to make that real. I’ve decided to use Amazon S3 to host files,
and EC2 to do the extracting.
extract.sh is a script that performs the
actual work with Osmosis and
terminates its host machine upon completion.
Adding New Cities
Extractotron is run a few times per month, to http://metro.teczno.com. If you have cities to add, you can add them directly to cities.txt and send me a pull request in Github.
cities.txt is a tab-delimited file, and has eight fields:
One of "Africa", "Asia", "Europe", "Middle East", "North America", "South America", or Oceania.
It's nice to have a link back to the Geonames dataset.
top, left, bottom, right
Geographic bounding box of the metropolitan area. These should be larger rather than smaller to surrounding countryside wherever possible. For example of coverage area, see Moscow.
Short, lowercase version of the name with dashes for spaces that's used for files.
Full name of the city.
Rolling Your Own
To use Extractotron yourself, use run-instance.py:
python run-instance.py <your AWS access key> <your AWS secret> <your bucket name>
By default, run-instance.py instantiates an m1.large instance with Alestic's
Ubuntu 11.04 Natty instance-store AMI ami-68ad5201. You can change the instance
type or AMI, see
python run-instance.py --help for details.
Currently, the cities list is very short. Help me expand it by modifying
cities.txt and sending a pull request via Github.