94 lines
2.9 KiB
Python
Executable file
94 lines
2.9 KiB
Python
Executable file
#!/usr/bin/env python3
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"""
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This script downloads and/or imports regions for statistical analysis into the
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PostGIS database. The regions are sourced from:
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* EU countries are covered by
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[NUTS](https://ec.europa.eu/eurostat/web/gisco/geodata/reference-data/administrative-units-statistical-units/nuts).
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"""
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import tempfile
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from dataclasses import dataclass
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import json
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import asyncio
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from os.path import basename, splitext
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import sys
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import logging
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from typing import Optional
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import aiohttp
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import psycopg
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from obs.api.app import app
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from obs.api.utils import chunk
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log = logging.getLogger(__name__)
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NUTS_URL = "https://gisco-services.ec.europa.eu/distribution/v2/nuts/geojson/NUTS_RG_01M_2021_3857.geojson"
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from pyproj import Transformer
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project = Transformer.from_crs("EPSG:4326", "EPSG:3857", always_xy=True).transform
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from shapely.ops import transform
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from shapely.geometry import shape
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import shapely.wkb as wkb
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async def import_nuts(
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connection, filename=None, level: int = 3, import_group: Optional[str] = None
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):
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if import_group is None:
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import_group = f"nuts{level}"
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if filename:
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log.info("Load NUTS from file")
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with open(filename) as f:
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data = json.load(f)
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else:
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log.info("Download NUTS regions from europa.eu")
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async with aiohttp.ClientSession() as session:
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async with session.get(NUTS_URL) as resp:
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data = await resp.json(content_type=None)
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async with connection.cursor() as cursor:
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log.info(
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"Delete previously imported regions with import group %s", import_group
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)
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await cursor.execute(
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"DELETE FROM region WHERE import_group = %s", (import_group,)
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)
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log.info("Import regions")
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async with cursor.copy(
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"COPY region (id, name, geometry, import_group) FROM STDIN"
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) as copy:
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for feature in data["features"]:
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if feature["properties"]["LEVL_CODE"] == level:
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geometry = shape(feature["geometry"])
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# geometry = transform(project, geometry)
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geometry = wkb.dumps(geometry)
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geometry = bytes.hex(geometry)
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await copy.write_row(
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(
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feature["properties"]["NUTS_ID"],
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feature["properties"]["NUTS_NAME"],
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geometry,
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import_group,
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)
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)
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async def main():
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logging.basicConfig(level=logging.DEBUG, format="%(levelname)s: %(message)s")
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url = app.config.POSTGRES_URL
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url = url.replace("+asyncpg", "")
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async with await psycopg.AsyncConnection.connect(url) as connection:
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await import_nuts(connection, sys.argv[1] if len(sys.argv) > 1 else None)
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if __name__ == "__main__":
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asyncio.run(main())
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