A simple script to transform the area of massif from meteofrance into a geojson.

area_to_geojson.py

from typing import Dict
BASE_URL = "http://www.meteofrance.com/mf3-rpc-portlet/js/datas/zones_AVDEPT{}.json"

DEPTS = ("73", "74", "05", "38")

import requests
from geojson import Feature, FeatureCollection

def get_area(dept: str) -> Dict:
    r = requests.get(BASE_URL.format(dept))
    assert r.status_code == 200, "Wrong status code aborting"
    return r.json()

def parse_geom(zone: str) -> Dict:
    geom = {'type': 'Polygon', 'coordinates': None}
    coords = zone.split(',')
    # we want the area to be projected in EPSG:4326. But lat need to be bound
    # in -180;+180 and long -90;+90.
    coords_int = [float(x)/100 for x in coords]
    geom['coordinates'] = [[coords_int[x+1], coords_int[x]] for x in range(0, len(coords_int)-1, 2)]
    geom['coordinates'] = [geom['coordinates']]
    return geom

def transform_to_geojson(area: Dict) -> FeatureCollection:
    final = list()
    for massif in area:
        f = Feature(geometry=parse_geom(massif['zone']), properties={'id':massif['id'], 'slug': massif['slug'], 'label': massif['label']})
        final.append(f)
    return FeatureCollection(final)



if __name__ == '__main__':
    for dept in DEPTS:
        area = get_area(dept)
        x = transform_to_geojson(area)
        with open(f'{dept}.geojson', 'w') as f:
            f.write(str(x))