osm_map_processing/custom_polys_and_extracts.md

Creating custom polys (some rough notes)

Head to https://www.openstreetmap.org/ and find the relation id of the boundry you want as a poly

Grab an appropriate pbf/osm.bz2 from http://download.geofabrik.de/ that INCLUDES the region you want to extract if not available

Head to http://polygons.openstreetmap.fr/index.py and enter relation id

Extract the region using osmosis https://wiki.openstreetmap.org/wiki/Osmosis/Examples http://blog.geofabrik.de/?p=75 ../bin/osmosis/bin/osmosis --read-pbf central-america-latest.osm.pbf
--tee 3
--bp file=costa_rica.poly --write-pbf costa-rica-latest.osm.pbf
--bp file=nicaragua.poly --write-pbf nicaragua-latest.osm.pbf
--bp file=panama.poly --write-pbf panama-latest.osm.pbf

../bin/osmosis/bin/osmosis --read-pbf australia-latest.osm.pbf
--tee 3
--bp file=new-south-wales.poly --write-pbf new-south-wales.osm.pbf
--bp file=queensland.poly --write-pbf queensland-latest.osm.pbf
--bp file=victoria.poly --write-pbf victoria-latest.osm.pbf