import requests import zipfile
if country_code not in urls: print(f"URL for {country_code} not found. Please check country code.") return None
def download_gadm_data(country_code, version="3.6", level=0): """ Download GADM data for a specific country Parameters: - country_code: ISO3 country code (e.g., 'IND' for India, 'USA' for United States) - version: GADM version (default '3.6') - level: Administrative level (0=country, 1=state/province, 2=district, etc.) """ # Create directory for data download_dir = Path(f"gadm_data_v{version}") download_dir.mkdir(exist_ok=True) # Construct URL for GADM data url = f"https://biogeo.ucdavis.edu/data/gadm{version.replace('.', '')}/gpkg/gadm{version.replace('.', '')}_{country_code}_gpkg.zip" # Alternative format if the above doesn't work # url = f"https://biogeo.ucdavis.edu/data/gadm{version.replace('.', '')}/shp/gadm{version.replace('.', '')}_{country_code}_{level}_shp.zip" zip_path = download_dir / f"gadm{version}_{country_code}.zip" print(f"Downloading GADM {version} data for {country_code}...") try: # Download the file response = requests.get(url, stream=True) response.raise_for_status() # Save zip file with open(zip_path, 'wb') as f: for chunk in response.iter_content(chunk_size=8192): f.write(chunk) print(f"Downloaded successfully to {zip_path}") # Extract zip file with zipfile.ZipFile(zip_path, 'r') as zip_ref: zip_ref.extractall(download_dir) print(f"Extracted to {download_dir}") # Find and load the GeoPackage file gpkg_files = list(download_dir.glob(f"*{country_code}*.gpkg")) if gpkg_files: gdf = gpd.read_file(gpkg_files[0], layer=str(level)) print(f"Loaded GADM level {level} data with {len(gdf)} features") return gdf else: print("No GeoPackage file found") return None except requests.exceptions.RequestException as e: print(f"Download error: {e}") return None download gadm data -version 3.6-
def generate_feature(gdf, feature_type="boundary"): """ Generate a feature from the GADM data Parameters: - gdf: GeoDataFrame with GADM data - feature_type: Type of feature to generate ('boundary', 'centroid', 'bbox', or 'simplified') """ if gdf is None or len(gdf) == 0: print("No data available") return None features = [] for idx, row in gdf.iterrows(): feature = { "type": "Feature", "properties": {}, "geometry": None } # Add properties for col in gdf.columns: if col != 'geometry': feature["properties"][col] = str(row[col]) if row[col] is not None else None # Generate geometry based on feature_type if feature_type == "boundary": feature["geometry"] = row.geometry.__geo_interface__ elif feature_type == "centroid": centroid = row.geometry.centroid feature["geometry"] = centroid.__geo_interface__ feature["properties"]["feature_type"] = "centroid" elif feature_type == "bbox": bbox = row.geometry.bounds from shapely.geometry import box bbox_geom = box(*bbox) feature["geometry"] = bbox_geom.__geo_interface__ feature["properties"]["feature_type"] = "bounding_box" elif feature_type == "simplified": # Simplify geometry (reduce complexity) simplified = row.geometry.simplify(tolerance=0.01) feature["geometry"] = simplified.__geo_interface__ feature["properties"]["feature_type"] = "simplified" features.append(feature) # Create FeatureCollection feature_collection = { "type": "FeatureCollection", "features": features, "metadata": { "source": "GADM version 3.6", "feature_type": feature_type, "num_features": len(features) } } return feature_collection
with open(zip_path, 'wb') as f: for chunk in response.iter_content(chunk_size=8192): f.write(chunk) import requests import zipfile if country_code not in
# Load the GeoPackage gpkg_path = os.path.join(output_dir, f"gadm36_{country_code}.gpkg") gdf = gpd.read_file(gpkg_path, layer=str(level))
with zipfile.ZipFile(zip_path, 'r') as zip_ref: zip_ref.extractall(output_dir) 'IND' for India
url = urls[country_code] output_dir = "gadm_data_v3.6" os.makedirs(output_dir, exist_ok=True)
import geopandas as gpd import requests import zipfile import os from pathlib import Path
return gdf gdf = download_gadm_alternative("IND", level=1)
print(f"Downloading from {url}") response = requests.get(url, stream=True)