如何从geojson中移除小于4个值的坐标

import json

def remove_coordinates_less_than_4(geojson_file):
    with open(geojson_file, 'r') as f:
        data = json.load(f)

    def process_coordinates(coordinates):
        if len(coordinates) < 4:
            return None
        else:
            return coordinates

    def process_geometry(geometry):
        if geometry['type'] == 'Polygon':
            geometry['coordinates'] = [process_coordinates(coordinates) for coordinates in geometry['coordinates']]
        elif geometry['type'] == 'MultiPolygon':
            geometry['coordinates'] = [[process_coordinates(coordinates) for coordinates in polygon] for polygon in geometry['coordinates']]
        return geometry

    for feature in data['features']:
        feature['geometry'] = process_geometry(feature['geometry'])

    new_geojson_file = geojson_file.replace('.geojson', '_filtered.geojson')
    with open(new_geojson_file, 'w') as f:
        json.dump(data, f)

    return new_geojson_file

# 使用示例
geojson_file = 'path/to/your/geojson_file.geojson'
filtered_geojson_file = remove_coordinates_less_than_4(geojson_file)
print(f"Filtered geojson file saved as: {filtered_geojson_file}")