# -*- 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_files_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_files_from_LGL_BW.py Freiburg "79098,79102" python download_files_from_LGL_BW.py Möhringen "70567" --download-only python download_files_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 regions Eric Duminil, 2025 """ import argparse from pathlib import Path from math import floor import subprocess import re import urllib.request import time import zipfile import logging from pyproj import CRS from pyproj import Transformer from shapely import wkt from shapely.ops import transform from shapely.geometry import Point from get_coordinates_by_zipcode import get_coordinates_by_zipcode # Setup logging logging.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/32632 TO_LOCAL_CRS = Transformer.from_crs(CRS.from_epsg(4326), CRS.from_epsg(32632), always_xy=True) UTM = 32 SCRIPT_DIR = Path(__file__).parent WAIT_BETWEEN_DOWNLOADS = 5 # [s] Be nice to LGL Server. GML_GLOB = "LoD2_*/LoD2_*.gml" def find_simstadt_folder(): """Find SimStadt installation on desktop""" try: 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_grid_coords(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") def extract_region(output_dir: Path, location_name: str, wkt_str: str, simstadt_folder: 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 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') 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.stderr: logger.error("%s", result.stderr) if result.returncode != 0: raise ValueError(f"RegionChooser failed with code {result.returncode}") logger.info(" DONE!") 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}" def convert_wkt_to_local(wkt_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 specific regions", formatter_class=argparse.RawDescriptionHelpFormatter, epilog=""" Examples: python download_files_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_files_from_LGL_BW.py Freiburg "79098,79102" python download_files_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='Region specification 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.') return parser.parse_args() def main(location_name: str, wkt_or_zipcode: str, download_only: bool = False, simstadt_folder: Path | None = None): """Main function to process arguments and run the download/extraction""" # Validate location name if ' ' in location_name: raise ValueError("Location name should not contain spaces: 'Some City' -> 'SomeCity'") # Create output directory output_dir = SCRIPT_DIR / (location_name + '.proj') output_dir.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_grid_coords(location_name, wkt_str) # Download region download_whole_region(output_dir, wkt_str, x1, x2, y1, y2) # Extract region if not download-only if not download_only: simstadt_folder = simstadt_folder or find_simstadt_folder() if not simstadt_folder: logger.error( "No SimStadt installation found! Please provide --simstadt-folder or use --download-only.") return extract_region(output_dir, location_name, wkt_str, simstadt_folder) else: logger.info("Download-only mode: Skipping region extraction.") logger.info("Processing of %s complete!", location_name) if __name__ == '__main__': args = parse_arguments() main(args.name, args.region, args.download_only, args.simstadt_folder)