Configuration

De-Duplication: Change radius

Upon importing the data, a de-duplication process runs. By default, within a 2000 meter radius and the same event date, a duplicate is detected.

INFO

The 2000 m default is driven by GeoSphere Austria, the primary base data set, which documents a maximum positional uncertainty of 2000 m. Using a smaller radius risks missing true duplicates introduced by this uncertainty.

This automatic duplicate check can have certain drawbacks. As mentioned in the Limitations section, some duplicates may remain and legitimate nearby events could be incorrectly flagged. If your use case requires a different trade-off, the radius can be adjusted.

After cloning the project, make changes to both functions find_duplicate() and is_duplicated() in src/db/duplicates.py. For example, increase the search radius from 2000 to 5000 meters:

def find_duplicate(  
    session: Session,
    landslide_date: datetime,
    landslide_geom: WKTElement,
    search_radius_meters: int = 2000,  
    search_radius_meters: int = 5000,  
) -> Landslides | None:

...

def is_duplicated(  
    session: Session,
    landslide_date: datetime,
    landslide_geom: WKTElement,
    search_radius_meters: int = 2000,  
    search_radius_meters: int = 5000,  
) -> bool:

...

After applying the changes, simply follow the quick start guide.

PostGIS port

By default, the PostGIS data base is exposed on port 5432. To change the port navigate to the .env file and simply change the POSTGRES_PORT variable. This example, changes the port from the default 5432 to 5173.

POSTGRES_USER=postgres
POSTGRES_PASSWORD=mysecretpassword
POSTGRES_HOST=localhost
POSTGRES_PORT=5432  
POSTGRES_PORT=5173  
POSTGRES_DB=landslides

INFO

docker-compose.yaml will pick up the new POSTGRES_PORT variable. Be sure, to restart the db and api service!

docker compose restart db api