OpenStreetMap is a popular collaborative project for creating a free map of the world. Every user participating in the project can edit data; at the same time, it is possible for everyone to download those datasets in .osm datafiles (an XML format) under the terms of the Open Data Commons Open Database License (ODbL) at the time of writing.
The osm2pgsql command is a command-line tool that can import .osm datafiles (eventually zipped) to the PostGIS database. To use the command, it is enough to give the PostgreSQL connection parameters and the .osm file to import.
It is possible to import only features that have certain tags in the spatial database, as defined in the default.style configuration file. You can decide to comment ...
