180 lines
7.4 KiB
Python
180 lines
7.4 KiB
Python
import os
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import argparse
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import geopandas as gpd
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import pygeohash as pgh
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import cbor2
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import pandas as pd
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import logging
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from shapely.geometry import box
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from shapely.ops import unary_union
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from tqdm import tqdm
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# Configure logging
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logging.basicConfig(format="%(levelname)s: %(message)s", level=logging.INFO)
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logger = logging.getLogger(__name__)
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def geohash_bbox(geohash_code):
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"""Returns a Shapely Polygon representing the bounding box of a geohash."""
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lat, lon, lat_err, lon_err = pgh.decode_exactly(geohash_code)
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lat_min, lon_min = lat - lat_err, lon - lon_err
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lat_max, lon_max = lat + lat_err, lon + lon_err
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return box(lon_min, lat_min, lon_max, lat_max)
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def get_existing_geohashes(output_dir):
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"""Returns a set of existing geohash parquet files in the output directory."""
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existing_geohashes = set()
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for filename in os.listdir(output_dir):
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if filename.endswith(".parquet"):
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geohash_code = filename[:-8] # Remove '.parquet' extension
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existing_geohashes.add(geohash_code)
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logger.info(f"Found {len(existing_geohashes)} existing geohash files in {output_dir}.")
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return existing_geohashes
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def subtract_existing_islands(water_gdf, existing_gdf):
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"""Subtracts intersecting land polygons (islands) from water polygons."""
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if existing_gdf.empty:
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return water_gdf # No islands to subtract
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# Collect all existing non-water geometries (islands or coastlines)
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land_geometries = existing_gdf[existing_gdf["tags"].apply(lambda tags: tags and tags.get("natural") != "water")]
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if land_geometries.empty:
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return water_gdf # No islands to subtract
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# Merge islands into a single geometry
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islands_union = unary_union(land_geometries.geometry)
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# Subtract islands from the water polygons
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water_gdf["geometry"] = water_gdf.geometry.difference(islands_union)
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# Remove empty geometries resulting from subtraction
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water_gdf = water_gdf[~water_gdf.geometry.is_empty]
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return water_gdf
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def intersect_geohash_tiles(water_polygons, coastline, geohashes):
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"""Finds and slices water polygons into geohash tiles along the coastline."""
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results = {}
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logger.info("Processing geohashes for intersection with water polygons...")
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for ghash in tqdm(geohashes, desc="Processing geohashes"):
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ghash_poly = geohash_bbox(ghash)
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# Select only water polygons that intersect with the geohash tile
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water_subset = water_polygons[water_polygons.intersects(ghash_poly)]
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if water_subset.empty:
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continue
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# Clip with geohash bounding box
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clipped_water = gpd.clip(water_subset, ghash_poly)
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# Remove areas already covered by coastline
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coastline_subset = coastline[coastline.intersects(ghash_poly)]
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if not coastline_subset.empty:
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clipped_water = clipped_water.overlay(coastline_subset, how="difference")
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# Add water-specific tags
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if not clipped_water.empty:
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clipped_water["tags"] = [{"natural": "water", "water": "sea"}] * len(clipped_water)
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clipped_water = clipped_water[["tags", "geometry"]] # Drop unnecessary columns
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results[ghash] = clipped_water
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logger.debug(f"Geohash {ghash} contains {len(clipped_water)} water polygons.")
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logger.info(f"Completed geohash processing. {len(results)} geohash tiles contain water polygons.")
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return results
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def append_to_existing_parquet(geohash_tiles, output_dir):
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"""Appends sliced water polygons to existing parquet files after subtracting islands."""
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for ghash, gdf in tqdm(geohash_tiles.items(), desc="Appending data"):
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parquet_path = os.path.join(output_dir, f"{ghash}.parquet")
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# Ensure input water polygons are in EPSG:4326
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gdf = gdf.to_crs("EPSG:4326")
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if os.path.exists(parquet_path):
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try:
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existing_gdf = gpd.read_parquet(parquet_path)
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# Ensure the existing file is in EPSG:4326 before merging
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if existing_gdf.crs != "EPSG:4326":
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existing_gdf = existing_gdf.to_crs("EPSG:4326")
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# Subtract islands (land features) from the new water polygons
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gdf = subtract_existing_islands(gdf, existing_gdf)
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# Merge the existing and new data
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gdf = pd.concat([existing_gdf, gdf], ignore_index=True)
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logger.debug(f"Appended new water polygons to {ghash}.parquet")
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except Exception as e:
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logger.warning(f"Failed to read {parquet_path}. Overwriting instead. Error: {e}")
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# Save the updated file
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gdf.to_parquet(parquet_path)
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logger.debug(f"Updated {ghash}.parquet with new data.")
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def save_optional_formats(geohash_tiles, output_dir, export_cbor, export_geojson):
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"""Saves geohash-sliced water polygons in CBOR and GeoJSON formats."""
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for ghash, gdf in tqdm(geohash_tiles.items(), desc="Saving optional formats"):
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if export_cbor:
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cbor_path = os.path.join(output_dir, f"{ghash}.cbor")
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with open(cbor_path, "wb") as f:
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cbor2.dump(gdf.to_dict(), f)
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logger.debug(f"Saved {ghash}.cbor")
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if export_geojson:
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geojson_path = os.path.join(output_dir, f"{ghash}.geojson")
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gdf.to_file(geojson_path, driver="GeoJSON")
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logger.debug(f"Saved {ghash}.geojson")
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def main():
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parser = argparse.ArgumentParser(description="Slice water polygons along the coastline into geohash tiles.")
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parser.add_argument("coastline", help="Path to the coastline Parquet file.")
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parser.add_argument("water", help="Path to the water polygons Parquet file.")
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parser.add_argument("output_dir", help="Directory to save the output files.")
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parser.add_argument("--cbor", action="store_true", help="Export as CBOR.")
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parser.add_argument("--geojson", action="store_true", help="Export as GeoJSON.")
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parser.add_argument("--verbose", action="store_true", help="Enable detailed logging.")
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args = parser.parse_args()
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# Set logging level
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if args.verbose:
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logger.setLevel(logging.DEBUG)
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logger.debug("Verbose logging enabled.")
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logger.info("Loading input datasets...")
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coastline = gpd.read_parquet(args.coastline)
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water_polygons = gpd.read_parquet(args.water)
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# Ensure the geometries are valid
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coastline = coastline[coastline.geometry.is_valid]
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water_polygons = water_polygons[water_polygons.geometry.is_valid]
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logger.info(f"Loaded coastline dataset with {len(coastline)} features.")
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logger.info(f"Loaded water polygons dataset with {len(water_polygons)} features.")
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# Get existing geohashes from the output directory
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existing_geohashes = get_existing_geohashes(args.output_dir)
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if not existing_geohashes:
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logger.error("No existing geohash parquet files found in the output directory. Exiting.")
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return
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# Intersect water polygons with only the existing geohash tiles
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geohash_tiles = intersect_geohash_tiles(water_polygons, coastline, existing_geohashes)
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if not geohash_tiles:
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logger.info("No new data to append. Exiting.")
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return
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# Append results to existing parquet files
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append_to_existing_parquet(geohash_tiles, args.output_dir)
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# Save optional formats
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save_optional_formats(geohash_tiles, args.output_dir, args.cbor, args.geojson)
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logger.info("Processing complete. All files updated.")
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if __name__ == "__main__":
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main()
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