59 lines
1.2 KiB
Python
59 lines
1.2 KiB
Python
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#!/bin/python3
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import osmapi
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import itertools
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import math
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# import pickle
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# import os
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OSM_KOGGENLAND_ID = 161930
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PICKLE_FILE = 'koggenland.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 flatten(lst):
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return list(itertools.chain(*lst))
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def main():
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osm_api = osmapi.OsmApi()
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koggenland = osm_api.RelationFullRecur(OSM_KOGGENLAND_ID)
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node_ids = list(map(lambda a: a['data']['id'], filter(
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lambda a: a['type'] == 'node', koggenland)))
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coords = []
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for chunk in chunks(node_ids, 100):
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coords += map(lambda a: (a['lat'], a['lon']),
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osm_api.NodesGet(chunk).values())
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cx, cy = 0., 0.
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for (x, y) in coords:
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cx += x
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cy += y
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cx /= len(coords)
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cy /= len(coords)
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print('centre', (cx, cy))
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# 7KM radius (eye-balled)
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# max_coord = None
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# max_dist = 0
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# for (x, y) in coords:
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# dist = math.sqrt((cx - x)**2 + (cy - y)**2)
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# if dist > max_dist:
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# max_dist = dist
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# max_coord = (x, y)
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# print('max', max_coord)
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if __name__ == '__main__':
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main()
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