Python wrapper for the OpenStreetMap Overpass API
Project description
This is a thin wrapper around the OpenStreetMap Overpass API.
Install it
$ pip install overpassIf you get an error similar to
OSError: Could not find library geos_c or load any of its variants ['libgeos_c.so.1', 'libgeos_c.so']
you can install the required libraries on linux with
$ sudo apt-get install libgeos-c1 libgeos-3.4.2Use it
You can use the overpass command line interface or use it as a Python library.
Command line interface
You can use the CLI to execute queries and save the result in a GeoJSON file.
Usage: overpass [OPTIONS] QUERY OUTPUT_FILE Run query and save the result in output_file Options: --timeout INTEGER Timeout in seconds --endpoint TEXT URL of your prefered API --help Show this message and exit.
For example:
overpass --timeout 50 'node(area:3602758138)[amenity=cafe]' brasilia-cafe.geojsonPython Library
>>> import overpass
>>> api = overpass.API()
>>> response = api.Get('node["name"="Salt Lake City"]')Note that you don’t have to include any of the output meta statements. The wrapper will, well, wrap those.
You will get your result as a dictionary, which (for now) represents the JSON output you would get from the Overpass API directly. So you could do this for example:
>>> print [(feature['tags']['name'], feature['id']) for feature in response['elements']]
[(u'Salt Lake City', 150935219), (u'Salt Lake City', 585370637), (u'Salt Lake City', 1615721573)]Parameters
The API takes a few parameters:
endpoint
The default endpoint is http://overpass-api.de/api/interpreter but you can pass in the rambler instance (http://overpass.osm.rambler.ru/cgi/interpreter) or your own:
api = overpass.API(endpoint=http://overpass.myserver/interpreter)timeout
The default timeout is 25 seconds, but you can set it to whatever you want.
api = overpass.API(timeout=600)debug
Setting this to True will get you debug output.
Simple queries
In addition to just send your query and parse the result, the wrapper provides shortcuts for often used map queries. To use them, just pass them like to normal query to the API.
MapQuery
This is a shorthand for a complete ways and relations query in a bounding box (the ‘map call’). You just pass the bounding box to the constructor:
>>> map_query = overpass.MapQuery(50.746,7.154,50.748,7.157)
>>> response = api.Get(map_query)WayQuery
This is shorthand for getting a set of ways and their child nodes that satisfy certain criteria. Pass the criteria as a Overpass QL stub to the constructor:
>>> way_query = overpass.WayQuery('[name=Highway 51]')
>>> response = api.Get(way_query)Need help? Want feature?
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