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This is a collection of .poly files for cities, with the definition of 'city' being the area one level under the state level. The ultimate goal is to have them all, but it's a rough process right now (as explained below)...
These .poly files are used to then extract just the city's OSM file from a greater region's OSM file. For example, creating an exact OSM file for Boston from the North America OSM file.
Sometimes there won't be a Relation ID for a city, or the Relation that exists will be broken. For those instances, the final OSM file can be created manually by tracing the city at http://extract.bbbike.org/ - just make sure you select one of the 'OSM XML' formats in the top pulldown menu there.
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Go to http://nominatim.openstreetmap.org/ and search for the city you'd like added
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Click the 'details' link for that city in the left column
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Make sure that the map on the right displays the full city border
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Copy the number for 'OSM: relation'
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Go to http://osm102.openstreetmap.fr/~jocelyn/polygons/index.py, paste the number into the form, and click the Submit button
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Click the 'poly' link to open the file in the browser
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Use
File -> Save Asto save the file. The naming convention I've been using iscity-name_state-abbreviation.poly. For example,holyoke_ma.poly
You can use the .poly file to extract that region from a greater region's OSM file.
- Install Osmosis
- If you're on a Mac, I suggest you use Homebrew to install it with
brew intsall osmosis
- If you're on a Mac, I suggest you use Homebrew to install it with
- Download the
.osm.pbffile for the region that the city is in from http://download.geofabrik.de/ - Run this to extract the city's OSM file out of the greater region's OSM file:
osmosis --read-pbf-fast file="YOUR-REGION-latest.osm.pbf" --bounding-polygon file="CITY-NAME_STATE.poly" --write-xml file="CITY-NAME_STATE.osm"For example:osmosis --read-pbf-fast file="north-america-latest.osm.pbf" --bounding-polygon file="holyoke_ma.poly" --write-xml file="holyoke_ma.osm"