Pull Request: Load Data from Local Parquet File & Expose API Endpoint

.env

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+AWS_ACCESS_KEY_ID = 'AKIATDC35CBYPE4BW3U4'
+AWS_SECRET_ACCESS_KEY = '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'
+AWS_REGION = 'eu-west-1'

.gitignore

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+/data
+/playground
+*.venv
+.html
+*.pyc

Makefile

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+SHELL := /bin/bash
+
+venv:
+	@echo "Creating virtual environment..."
+	@python -m venv venv
+	@echo "Virtual environment created successfully."
+
+activate:
+	@echo "Activating virtual environment..."
+	@source venv/bin/activate
+	@echo "Virtual environment activated. Use 'deactivate' to exit."
+
+install:
+	@echo "Installing dependencies..."
+	@pip install -r requirements.txt
+	@echo "Dependencies installed successfully."
+
+format:
+	@echo "Formatting code..."
+	@black --line-length 79 --target-version py310 --skip-string-normalization --exclude venv,build,dist,docs .
+	@isort --profile black --line-length 79 --skip venv,build,dist,docs .
+	@pylint --max-line-length 79 --ignore=E501,W503 --exclude venv,build,dist,docs .
+	@echo "Code formatted successfully."

api/crud/flood.py

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+"""
+Author: Ajeyomi Adedoyin Samuel
+Email: [email protected]
+Title: Flood Risk Intersect Checker
+
+Description:
+------------
+This script Loads flood risk polygon data(parquet file), loads it using duckdb, 
+and check if the coordinate point(s) intersect with the flood-prone areas.
+
+IT accepts Geoparquet with lon and lat of a location and applies spatial 
+analysis to determine whether input geographic points fall within any of the designated flood zones.
+
+Modules:
+--------
+- duckdb
+- typing
+- shapely
+
+Functions:
+---------
+get_flood_information(bucket, key, longitude, latitude)
+    Get a geographical coordinates as input and  checks if they intersect with flood zones,
+    and returns the results as JSON.
+
+Usage:
+------
+- Ensure you put the correct path to your parqet file
+- Call `get_flood_information()` with either single or list of `longitude` and `latitude` values.
+
+Note:
+-----
+- This script assumes that the geospatial data is readable by duckdb and contains a geometry column.
+"""
+
+
+
+import sys
+import os
+sys.path.append(os.path.dirname(os.path.dirname(os.path.dirname(__file__))))
+
+from .utils.duckdb import setup_spatial_extensions
+from .utils.utils import validate_coordinates
+import duckdb
+import json
+from shapely.geometry import Point
+from core.config import FLOOD_DATA
+
+
+
+def get_flood_information(
+    point_lon: float,
+    point_lat: float,
+    parquet_path:str=FLOOD_DATA,
+    buffer_degrees: float = 0.00001  # ~0.1m buffer for pre-filtering
+) -> json:
+    """Check if a coordinate intersect with flood zones"""  
+
+    # validate the input coordinates
+    validate_coordinates(point_lon, point_lat)
+
+    # Setup spatial extensions
+    setup_spatial_extensions()
+
+    # Create point and bounding box
+    point_wkt = Point(point_lon, point_lat).wkt
+
+    # Bounding box for pre-filtering
+    bbox_min_lon = point_lon - buffer_degrees
+    bbox_max_lon = point_lon + buffer_degrees  
+    bbox_min_lat = point_lat - buffer_degrees
+    bbox_max_lat = point_lat + buffer_degrees
+
+    print(f"Checking intersection for: {point_wkt}")
+    print(f"Using bounding box filter: [{bbox_min_lon:.6f}, {bbox_min_lat:.6f}, {bbox_max_lon:.6f}, {bbox_max_lat:.6f}]")
+
+    try:
+        print("Running optimized spatial query...")
+        result = duckdb.sql(f"""
+                    SELECT 1
+                  FROM (
+                      SELECT geometry
+                      FROM read_parquet('{parquet_path}')
+                  )
+                WHERE 
+                    -- Fast bounding box pre-filter using geometry bounds
+                    ST_XMin(geometry) <= {bbox_max_lon}
+                    AND ST_XMax(geometry) >= {bbox_min_lon}
+                    AND ST_YMin(geometry) <= {bbox_max_lat}
+                    AND ST_YMax(geometry) >= {bbox_min_lat}
+                    -- Perform expensive intersection
+                    AND ST_Intersects(geometry, ST_GeomFromText('{point_wkt}'))
+                LIMIT 1
+            """).fetchone()
+
+        intersects = result is not None
+
+        result = {
+                "longitude": point_lon,
+                "latitude": point_lat,
+                "flood_zone": intersects
+            }
+
+        return result
+
+    except Exception as e:
+        raise RuntimeError(f"{e.__class__.__name__}: {str(e)}")
+
+
+# if __name__ == "__main__":
+#     start_time = time.time()
+
+#     point_lon=12.772144
+#     point_lat=45.562546
+
+
+#     result = get_flood_information(
+#             point_lon=point_lon,
+#             point_lat=point_lat,
+#             parquet_path=FLOOD_DATA)
+
+#     elapsed = time.time() - start_time
+#     print(f"Total time taken: {elapsed:.2f}s - Result: {result}")
+

api/crud/utils/duckdb.py

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+import duckdb
+
+def setup_spatial_extensions():
+    """Install and load spatial extension with performance settings"""
+    try:
+        duckdb.sql("INSTALL spatial;")
+        duckdb.sql("LOAD spatial;")
+
+        # Performance optimizations
+        duckdb.sql("SET threads=2;")  # Use multiple threads
+        duckdb.sql("SET memory_limit='2GB';")  # Increase memory limit
+        duckdb.sql("SET max_memory='2GB';")
+
+        print("Spatial extension loaded with performance settings")
+    except Exception as e:
+        print(f"Note: Spatial extension setup: {e}")

api/crud/utils/utils.py

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+def validate_coordinates(longitude:float,
+                        latitude:float) -> tuple:
+    """Validate and normalize coordinate inputs"""
+    if isinstance(longitude, (float)) and isinstance(latitude, (float)):
+        return [longitude], [latitude]
+    raise ValueError("Coordinates must be floats")

api/route/flood.py

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+from fastapi import APIRouter, HTTPException
+from api.crud.flood import get_flood_information
+from schema.flood import FloodDataResponse
+
+import sys
+import os
+sys.path.append(os.path.dirname(__file__))
+
+
+flood_route = APIRouter()
+
+@flood_route.get("/flood-risk",
+         response_model=FloodDataResponse,
+         status_code=200,
+         tags=["Flood Risk"],
+         description="Check if a particular location is flooded or not")
+async def get_flood_info(longitude: float, latitude: float) -> FloodDataResponse:
+    """Check if the latitudes and longitudes intersect with flood areas and return info as JSON"""
+    try:
+        data = get_flood_information(longitude, latitude)
+        if not data:
+            raise HTTPException(
+                status_code=404,
+                detail=f"No flood risk data found for location ({latitude}, {longitude})."
+            )
+        return data
+    except ValueError as ve:
+        raise HTTPException(status_code=400, detail=str(ve))
+    except Exception:
+        raise HTTPException(status_code=500, detail="Internal server error.")

core/config.py

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+FLOOD_DATA = r'C:\Users\Admin\Desktop\ongoing_tasks\environtrust\data\flood.parquet'
+