64 lines
1.6 KiB
Python
Executable file
64 lines
1.6 KiB
Python
Executable file
#!/bin/python3
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import osmapi
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import shapely
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import pickle
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from os.path import exists
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OSM_KOGGENLAND_ID = 161930
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PICKLE_FILE = 'polygon.pickle'
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def chunks(lst, n):
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"""Yield successive n-sized chunks from lst."""
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for i in range(0, len(lst), n):
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yield lst[i:i + n]
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def dump_polygon():
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osm_api = osmapi.OsmApi()
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koggenland = osm_api.RelationGet(OSM_KOGGENLAND_ID)
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ways = filter(lambda x: x['type'] == 'way', koggenland['member'])
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shell_ids = []
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for way in ways:
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way = osm_api.WayGet(way['ref'])
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node_ids = way['nd']
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if not shell_ids:
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shell_ids.append(node_ids[0])
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for node_id in node_ids[1:]:
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shell_ids.append(node_id)
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node_data = dict()
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for chunk in chunks(shell_ids, 100):
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node_data |= osm_api.NodesGet(chunk)
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shell = list()
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for shell_id in shell_ids:
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node = node_data[shell_id]
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shell.append((node['lat'], node['lon']))
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koggenland_polygon = shapely.Polygon(shell)
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with open(PICKLE_FILE, 'wb') as f:
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pickle.dump(koggenland_polygon, f)
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def main():
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if not exists(PICKLE_FILE):
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print('Using OSM API to create polygon...')
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dump_polygon()
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print('Dumped polygon to file.')
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with open(PICKLE_FILE, 'rb') as f:
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area = pickle.load(f)
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print('Loaded polygon from file.')
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point_out = shapely.Point(52.68811, 4.91267)
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point_in = shapely.Point(52.69168, 4.91324)
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print('out', area.contains(point_out))
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print('in', area.contains(point_in))
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if __name__ == '__main__':
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main()
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