45 lines
1.3 KiB
Python
45 lines
1.3 KiB
Python
"""Download England country boundary GeoJSON from ONS Open Geography Portal.
|
|
|
|
Source: ONS Countries (December 2024) Boundaries UK BGC (Generalised Clipped)
|
|
Licence: OGL v3
|
|
"""
|
|
|
|
import argparse
|
|
from pathlib import Path
|
|
|
|
import httpx
|
|
|
|
# ArcGIS REST API — query for England only, generalised (BGC) resolution
|
|
URL = (
|
|
"https://services1.arcgis.com/ESMARspQHYMw9BZ9/arcgis/rest/services/"
|
|
"Countries_December_2024_Boundaries_UK_BGC/FeatureServer/0/query"
|
|
"?where=CTRY24NM%3D%27England%27&outFields=CTRY24NM&f=geojson"
|
|
)
|
|
|
|
|
|
def main() -> None:
|
|
parser = argparse.ArgumentParser(
|
|
description="Download England country boundary GeoJSON"
|
|
)
|
|
parser.add_argument(
|
|
"--output", type=Path, required=True, help="Output GeoJSON file path"
|
|
)
|
|
args = parser.parse_args()
|
|
args.output.parent.mkdir(parents=True, exist_ok=True)
|
|
|
|
print("Downloading England boundary from ONS...")
|
|
response = httpx.get(URL, follow_redirects=True, timeout=60)
|
|
response.raise_for_status()
|
|
|
|
data = response.json()
|
|
features = data.get("features", [])
|
|
if len(features) != 1:
|
|
raise ValueError(f"Expected 1 feature for England, got {len(features)}")
|
|
|
|
args.output.write_text(response.text)
|
|
size_kb = args.output.stat().st_size / 1024
|
|
print(f"Saved to {args.output} ({size_kb:.0f} KB)")
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|