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Eric Duminil authored76a8c8b2
# -*- coding: utf-8 -*-"""LoD2 CityGML tiles are available for whole Baden-Württemberg, from LGL.https://opengeodata.lgl-bw.de/#/(sidenav:product/12)This script downloads the required tiles for given regions(as WKT strings, Zipcode or Zipcodes), and extracts the region.Usage: python download_LoD2_from_LGL_BW.py StuttgartCenter "POLYGON((9.175287 48.780916, 9.185501 48.777522, 9.181467 48.773704, 9.174429 48.768472, 9.168807 48.773902, 9.175287 48.780916))" python download_LoD2_from_LGL_BW.py Freiburg "79098,79102" python download_LoD2_from_LGL_BW.py Möhringen "70567" --download-only python download_LoD2_from_LGL_BW.py CustomPath "POLYGON(...)" --simstadt-folder "/path/to/SimStadt"Required:* Python* pyproj project (https://pypi.org/project/pyproj/)* SimStadt installed on the Desktop (for RegionChooser) if extracting regionsEric Duminil, 2025"""import argparsefrom pathlib import Pathfrom math import floorimport subprocessimport reimport urllib.requestimport timeimport zipfileimport loggingfrom pyproj import CRSfrom pyproj import Transformerfrom shapely import wktfrom shapely.ops import transformfrom shapely.geometry import Pointfrom get_coordinates_by_zipcode import get_coordinates_by_zipcode# Setup logginglogging.basicConfig( level=logging.INFO, format='%(levelname)s - %(message)s',)logger = logging.getLogger(__name__)COORDINATES_REGEX = re.compile(r"(\-?\d+\.\d*) (\-?\d+\.\d*)")CITYGML_SERVER = "https://opengeodata.lgl-bw.de/data/lod2"RASTER = 2 # [km]KILOMETER = 1000 # [m]BUNDESLAND = 'bw'# UTM32N, used in BW. https://epsg.io/32632TO_LOCAL_CRS = Transformer.from_crs(CRS.from_epsg(4326), CRS.from_epsg(32632), always_xy=True)UTM = 32SCRIPT_DIR = Path(__file__).parentWAIT_BETWEEN_DOWNLOADS = 5 # [s] Be nice to LGL Server.GML_GLOB = "LoD2_*/LoD2_*.gml"def find_simstadt_folder(): """Find SimStadt installation on desktop""" try:
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simstadt_folder = next(x for x in Path.home().glob('Desktop/SimStadt*_0.*/') if x.is_dir())
logger.info("RegionChooser has been found in %s", simstadt_folder)
return simstadt_folder
except StopIteration:
return None
def coordinates_to_grid(longitude: float, latitude: float) -> tuple[int, int]:
"""Returns (x, y) of the tile on CITYGML_SERVER containing a given point."""
x, y = TO_LOCAL_CRS.transform(longitude, latitude)
x = floor(x / KILOMETER) - 1 # Odd x
y = floor(y / KILOMETER) # Even y
x -= x % RASTER
y -= y % RASTER
return (x + 1, y)
def wkt_polygon_to_bounding_box(location_name: str, wkt_str: str) -> tuple[int, int, int, int]:
"""Returns (x, y) of lower-left and bottom-right tiles, containing a given region."""
if 'POLYGON' not in wkt_str:
raise ValueError(f"wkt for {location_name} should be a WKT POLYGON or MULTIPOLYGON")
coordinates = re.findall(r'\-?\d+\.\d+', wkt_str)
lons = [float(lon) for lon in coordinates[::2]]
lats = [float(lat) for lat in coordinates[1::2]]
min_lon, max_lon = min(lons), max(lons)
min_lat, max_lat = min(lats), max(lats)
logger.info("%s (%.3f°N %.3f°E -> %.3f°N %.3f°E)",
location_name, max_lat, min_lon, min_lat, max_lon)
x1, y1 = coordinates_to_grid(min_lon, min_lat)
x2, y2 = coordinates_to_grid(max_lon, max_lat)
return (x1, x2, y1, y2)
def download_whole_region(output_dir: Path, wkt_region: str, x1: int, x2: int, y1: int, y2: int) -> None:
"""Downloads every zip of a given region, to output_dir, and extracts CityGML files."""
wgs84_region = wkt.loads(wkt_region)
local_region = transform(TO_LOCAL_CRS.transform, wgs84_region)
for x in range(x1, x2 + 1, RASTER):
for y in range(y1, y2 + 1, RASTER):
tile_center = Point((x + 1) * KILOMETER, (y + 1) * KILOMETER)
if local_region.distance(tile_center) > RASTER * KILOMETER:
continue
citygml_zip = f"LoD2_{UTM}_{x}_{y}_{RASTER}_{BUNDESLAND}.zip"
citygml_url = f"{CITYGML_SERVER}/{citygml_zip}"
local_zip = output_dir / citygml_zip
if local_zip.exists():
logger.info(" %s already in %s/", local_zip.name, output_dir.name)
else:
logger.info(" Download %s to %s/", citygml_zip, output_dir.name)
try:
urllib.request.urlretrieve(citygml_url, local_zip)
logger.info("✅ Download successful")
except urllib.error.HTTPError as e:
logger.error("❌ %s", e)
continue
finally:
time.sleep(WAIT_BETWEEN_DOWNLOADS)
logger.info(" Extract %s to %s/", citygml_zip, output_dir.name)
with zipfile.ZipFile(local_zip, "r") as zip_ref:
zip_ref.extractall(output_dir)
logger.info("✅ Extraction successful")
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def extract_region(output_dir: Path, location_name: str, wkt_str: str, simstadt_folder: Path) -> Path | None:
"""Uses RegionChooser to extract a given region from all the CityGML files found in subfolder."""
output_file = output_dir / (location_name + '.gml')
if output_file.exists():
logger.info(" %s already exists. Not extracting.", output_file)
return output_file
region_chooser_libs = simstadt_folder / 'lib/*'
gml_inputs = list(output_dir.glob(GML_GLOB))
if len(gml_inputs) == 0:
logger.error(
"Error: No CityGML found. At least part of the region should be in Baden-Württemberg!")
return
params_path = output_dir / 'params.txt'
wkt_path = output_dir / 'region.wkt'
local_wkt = convert_wkt_to_local(wkt_str)
logger.info(" Extracting %s.", output_file)
with open(wkt_path, 'w') as f:
f.write(local_wkt)
with open(params_path, 'w', encoding='utf-8') as f:
f.write("--input\n\"")
f.write(','.join(f'{gml.as_posix()}' for gml in gml_inputs))
f.write("\"\n")
f.write("--output\n")
f.write(f'"{output_file.as_posix()}"\n')
f.write('--local\n')
f.write("--wkt\n")
f.write(f'"{wkt_path.as_posix()}"\n')
result = subprocess.run(['java', '-classpath', f'{region_chooser_libs}',
'eu.simstadt.regionchooser.RegionChooserCLI',
f'@{params_path}'
],
text=True,
capture_output=True,
check=False
)
if result.returncode != 0:
if result.stderr:
logger.error("%s", result.stderr)
raise ValueError(f"RegionChooser failed with code {result.returncode}")
logger.info(" DONE!")
return output_file
def get_wkt(wkt_or_zipcode: str) -> str:
"""Returns WKT string for a given region, either specified as a POLYGON, or Zipcode(s).
"POLYGON((...))"
"MULTIPOLYGON(((...)))"
"70567"
"70567,70569"
"""
if 'POLYGON' in wkt_or_zipcode:
return wkt_or_zipcode
return get_coordinates_by_zipcode(wkt_or_zipcode.split(','))
def convert_coordinates(match):
"""Convert WGS84 coordinates to UTM32N"""
longitude, latitude = match.groups()
x, y = TO_LOCAL_CRS.transform(longitude, latitude)
return f"{x} {y}"
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def convert_wkt_to_local(wkt_str: str) -> str:
"""Convert WKT from WGS84 to UTM32N"""
return COORDINATES_REGEX.sub(convert_coordinates, wkt_str)
def parse_arguments():
"""Parse command line arguments"""
parser = argparse.ArgumentParser(
description="Download LoD2 CityGML tiles from LGL Baden-Württemberg and extract desired regions",
formatter_class=argparse.RawDescriptionHelpFormatter,
epilog="""
Examples:
python download_LoD2_from_LGL_BW.py StuttgartCenter "POLYGON((9.175287 48.780916, 9.185501 48.777522, 9.181467 48.773704, 9.174429 48.768472, 9.168807 48.773902, 9.175287 48.780916))"
python download_LoD2_from_LGL_BW.py Freiburg "79098,79102" --output-folder="/path/to/FreiburgFolder"
python download_LoD2_from_LGL_BW.py Möhringen "70567" --download-only
"""
)
parser.add_argument('name', type=str,
help='Name of the region (no spaces allowed). Output files will use this name.')
parser.add_argument('region', type=str,
help='Desired region as as WKT POLYGON/MULTIPOLYGON string or zipcode(s) (comma-separated).')
parser.add_argument('--download-only', action='store_true',
help='Only download files without extracting the region (default: False).')
parser.add_argument('--simstadt-folder', type=Path, default=None,
help='Path to SimStadt installation folder. By default, tries to find it on the Desktop.')
parser.add_argument('--output-folder', type=Path, default=None,
help='Folder in which the tiles should be downloaded and extracted. By default, use the folder of the current script / name.proj.')
return parser.parse_args()
def main(location_name: str, wkt_or_zipcode: str, download_only: bool = False,
simstadt_folder: Path | str | None = None, output_folder: Path | str | None = None) -> Path | None:
"""Main function to process arguments and run the download/extraction"""
# Validate location name
if ' ' in location_name:
logger.warning("Location contains spaces, some workflows might fail.")
if output_folder:
output_folder = Path(output_folder)
else:
# Create output directory
output_folder = SCRIPT_DIR / (location_name + '.proj')
output_folder.mkdir(parents=True, exist_ok=True)
# Get WKT string
wkt_str = get_wkt(wkt_or_zipcode)
# Get grid coordinates
x1, x2, y1, y2 = wkt_polygon_to_bounding_box(location_name, wkt_str)
# Download region
download_whole_region(output_folder, wkt_str, x1, x2, y1, y2)
gml_path = None
# Extract region if not download-only
if not download_only:
simstadt_folder = simstadt_folder or find_simstadt_folder()
if simstadt_folder:
simstadt_folder = Path(simstadt_folder)
else:
logger.error(
"No SimStadt installation found! Please provide --simstadt-folder or use --download-only.")
return
gml_path = extract_region(output_folder, location_name, wkt_str, simstadt_folder)
else:
logger.info("Download-only mode: Skipping region extraction.")
logger.info("Processing of %s complete!", location_name)
return gml_path
if __name__ == '__main__':
args = parse_arguments()
main(args.name, args.region, args.download_only, args.simstadt_folder, args.output_folder)