def coordinate(latitude, longitude):
    """Coordinate data model.

    Parameters
    ----------
    latitude : float
        Decimal degree coordinate in EPSG:4326 projection.
    longitude : float
        Decimal degree coordinate in EPSG:4326 projection.

    Returns
    -------
    coordinate : dict
        Coordinate data model as a dictionnary.
    """
    return {
        'latitude': latitude,
        'longitude': longitude
    }