72 lines
1.7 KiB
Python
72 lines
1.7 KiB
Python
"""Load OS MasterMap from GeoJSON to Postgres
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Use `fid` as source_id
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"""
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import json
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import glob
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import os
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import sys
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import psycopg2
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import shapely.geometry
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def main(source_dir, config_path):
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"""Load config, read files and save features to the database
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"""
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conf = read_config(config_path)
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dbconf = conf['database']
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conn = psycopg2.connect(**dbconf)
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files = glob.glob(os.path.join(source_dir, '*.geojson'))
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n = len(files)
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for i, filename in enumerate(files):
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print("Processing {} ({} of {})".format(filename, i+1, n))
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with open(filename, 'r') as fh:
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data = json.load(fh)
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with conn.cursor() as cur:
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for feature in data['features']:
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save_feature(cur, feature)
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conn.commit()
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def save_feature(cur, feature):
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"""Save a feature with geometry and source id
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"""
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cur.execute("""INSERT INTO geometries
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(
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geometry_doc,
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geometry_geom
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)
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VALUES
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(
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%s,
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ST_SetSRID(%s::geometry, %s)
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)
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""", (
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json.dumps({
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'source_id': feature['properties']['fid']
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}),
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shapely.geometry.shape(feature['geometry']).wkb_hex,
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3857
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)
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)
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def read_config(config_path):
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"""Read a JSON config file containing database connection details
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"""
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with open(config_path, 'r') as fh:
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conf = json.load(fh)
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return conf
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if __name__ == '__main__':
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if len(sys.argv) != 3:
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print("Usage: {} ./path/to/source/dir ./path/to/dbconfig.json".format(
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os.path.basename(__file__)
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))
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exit()
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main(sys.argv[1], sys.argv[2])
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