to_geojsonl.py

import json
from argparse import ArgumentParser


def convert(input_file, output_file):
    with open(input_file, 'r') as fin:
        data2 = json.load(fin)

    features = data2['features']
    with open(output_file, 'w') as fout:
        for f in features:
            labels = [p for p in f['properties'].keys() if p.startswith('label|')]
            latest_label = sorted(labels)[-1]
            f['properties']['level'] = f['properties'][latest_label]
            json.dump(f, fout)
            fout.write('\n')


if __name__ == '__main__':
    parser = ArgumentParser()
    parser.add_argument("-i", default="data.geo.json")
    parser.add_argument("-o", default="data.geojsonl")
    args = parser.parse_args()
    convert(args.i, args.o)