Getting warning for already existing fields for WFS services

[SeppBerkner]

Hi everyone 👋,

I am getting the following warning for several WFS services that I try to call:

WARNING:fiona._env:Field with same name (<field_name>) already exists in (<feature_name>). Skipping newer ones

Sometimes also along with this warning:

WARNING:fiona.ogrext:Field name collision detected, field is skipped: i=1, key='gml_id'

Using Dagster as the orchestration tool my logs are bloaded with the above warnings that exist for almost every WFS. An example is the WFS https://inspire.brandenburg.de/services/au_bdlm_wfs with the au:AdministrativeUnit feature

I am using my custom function to get data from different WFS into my Data Warehouse using owslib:

def get_wfs_data(
    wfs_url: str, 
    feature_type: str,
    version: str
) -> pd.DataFrame:
    """
    Function to retrieve data from a Web Feature Service (WFS)

    Parameters:
        wfs_url (str): Base URL string of the WFS (everything in front of '?')
        feature_type (str): Name of the feature to be retrieved
        version (str): Version of the WFS (e.g. '2.0.0')

    Returns:
        geopandas GeoDataFrame
    """
    # Connect to the WFS service
    try:
        wfs = WebFeatureService(url=wfs_url, version=version)
    except Exception as e:
        print(f'The connection to the WFS [{wfs_url}] could not be established. The error message is: \n {e}')

    # Create a GetFeature request
    try:
        response = wfs.getfeature(typename=feature_type)
    except Exception as e:
        print(f'''GetFeature request for the WFS [{wfs_url}] and the feature [{feature_type}] could not be executed. 
              The error message is: \n {e}''')

    # Read the response into a GeoDataFrame
    gdf = gpd.read_file(response)

    # these steps are necessary because dlt cannot handle spatial data
    gdf["epsg"] = gdf.crs.to_epsg() if gdf.crs else None
    gdf = gdf.to_wkb(hex=True)

    return gdf

What are the reasons for these warning and what can I do to solve them?

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