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Eric Duminil authored1b0a939a
# -*- 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 requires tiles for given regions(as WKT strings, in *polygons* variable), and extracts the region.Required:* Python* pyproj project (https://pypi.org/project/pyproj/)* SimStadt installed on the Desktop (for RegionChooser)Eric Duminil, 2024"""from pathlib import Pathfrom math import floorimport subprocessimport reimport urllib.requestimport timeimport zipfilefrom pyproj import CRSfrom pyproj import Transformer###### User input ##########POLYGONS = { "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))", # "AnotherRegion": "Another WKT Polygon...",}# Should RegionChooser extract the regions from multiple CityGMLs?EXTRACT_REGIONS = True############################CITYGML_SERVER = "https://opengeodata.lgl-bw.de/data/lod2"RASTER = 2 # [km]BUNDESLAND = 'bw'WGS84 = CRS.from_epsg(4326)LOCAL_CRS = CRS.from_epsg(32632) # UTM32N, used in BW. https://epsg.io/32632UTM = 32SCRIPT_DIR = Path(__file__).parentWAIT_BETWEEN_DOWNLOADS = 5 # [s] Be nice to LGL Server.if EXTRACT_REGIONS: try: SIMSTADT_FOLDER = next(x for x in Path.home().glob('Desktop/SimStadt*_0.*/') if x.is_dir()) print(f"RegionChooser has been found in {SIMSTADT_FOLDER}") except StopIteration: exit("No SimStadt installation found!" "\nPlease copy a SimStadt installation to the desktop," "\nset EXTRACT_REGIONS to False," "\nor set SIMSTADT_FOLDER manually: SIMSTADT_FOLDER = Path('/path/to/SimStadt')" ) GML_GLOB = "LoD2_*/LoD2_*.gml"def coordinates_to_grid(longitude: float, latitude: float, local_utm: CRS) -> tuple[int, int]: """Returns (x, y) of the tile on CITYGML_SERVER containing a given point.""" transformer = Transformer.from_crs(WGS84, local_utm, always_xy=True) x, y = transformer.transform(longitude, latitude) x = floor(x / 1000) - 1 # Odd x y = floor(y / 1000) # Even y x -= x % RASTER y -= y % RASTER return (x + 1, y)
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def wkt_polygon_to_grid_coords(location_name: str, wkt: 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:
raise ValueError(f"wkt for {location_name} should be a WKT POLYGON or MULTIPOLYGON")
coordinates = re.findall(r'\-?\d+\.\d+', wkt)
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)
print("%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, LOCAL_CRS)
x2, y2 = coordinates_to_grid(max_lon, max_lat, LOCAL_CRS)
return (x1, x2, y1, y2)
def download_rectangle(output_dir: Path, x1: int, x2: int, y1: int, y2: int) -> None:
"""Downloads every zip of a given region, to output_dir, and extracts CityGML files."""
for x in range(x1, x2 + 1, RASTER):
for y in range(y1, y2 + 1, RASTER):
citygml_zip = f"LoD2_{UTM}_{x}_{y}_{RASTER}_{BUNDESLAND}.zip"
citygml_url = f"{CITYGML_SERVER}/{citygml_zip}"
local_zip = output_dir / citygml_zip # .replace('.zip', '.gml')
if local_zip.exists():
print(f" {local_zip.name} already in {output_dir.name}/")
else:
print(f" Download {citygml_zip} to {output_dir.name}/ ", end='')
try:
urllib.request.urlretrieve(citygml_url, local_zip)
except urllib.error.HTTPError as e:
print(f"❌ {e}")
continue
finally:
time.sleep(WAIT_BETWEEN_DOWNLOADS)
print("✅")
print(f" Extract {citygml_zip} to {output_dir.name}/ ", end='')
print("✅")
print("")
with zipfile.ZipFile(local_zip, "r") as zip_ref:
zip_ref.extractall(output_dir)
def extract_region(output_dir: Path, location_name: str, wkt: str) -> 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():
print(f" {output_file} already exists. Not extracting.")
return
region_chooser_libs = Path(SIMSTADT_FOLDER).expanduser() / 'lib/*'
gml_inputs = list(output_dir.glob(GML_GLOB))
if len(gml_inputs) == 0:
print("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'
print(f" Extracting {output_file}.")
with open(wkt_path, 'w') as f:
f.write(wkt)
with open(params_path, 'w') as f:
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f.write("--input\n")
f.write(','.join(f"{gml}" for gml in gml_inputs))
f.write("\n")
f.write("--output\n")
f.write(f'"{output_file}"\n')
f.write("--wkt\n")
f.write(f'"{wkt_path}"\n')
result = subprocess.run(['java', '-classpath', f'{region_chooser_libs}',
'eu.simstadt.regionchooser.RegionChooserCLI',
f'@{params_path}'
],
text=True,
capture_output=True,
check=True
)
if (result.stderr):
print(result.stderr)
print(" DONE!")
def main(polygons: dict[str, str]) -> None:
"""Downloads ZIP files, extracts CityGML files, and selects desired region."""
for location_name, wkt in polygons.items():
if ' ' in location_name:
raise ValueError("Location name should not contain spaces: 'Some City' -> 'SomeCity'")
output_dir = SCRIPT_DIR / (location_name + '.proj')
output_dir.mkdir(parents=True, exist_ok=True)
x1, x2, y1, y2 = wkt_polygon_to_grid_coords(location_name, wkt)
download_rectangle(output_dir, x1, x2, y1, y2)
if EXTRACT_REGIONS:
extract_region(output_dir, location_name, wkt)
print()
if __name__ == '__main__':
main(POLYGONS)