kml to geojson

parse_kml.py

from xml.etree import ElementTree
from shapely.geometry import Polygon, Point
import json

poly_table = []

data = open('/tmp/chicago.kml')
tree = ElementTree.parse(data)
namespace = tree.getroot().tag[1:].split("}")[0]
placemarks = tree.findall(".//{%s}Placemark" % namespace)
for p in placemarks:
    for d in p.findall(".//{%s}Data" % namespace):
        if d.attrib.get('name') == 'OBJECTID':
            name = d.find('.//{%s}value' % namespace).text
    coord_text = p.find('.//{%s}coordinates' % namespace).text
    coord_pairs = coord_text.split(' ')
    coords = [z.split(',')[0:2] for z in coord_pairs]
    polygon = [(float(x[0]),float(x[1])) for x in coords]

    poly_table.append((polygon,name))

features = []
for polygon,name in poly_table:
    new_feature = {
        'type':'Feature',
        'geometry': {
            'type':'Polygon',
            'coordinates': [polygon]
        },
        'properties': {
            'neighborhood': name,
        },
    }
    features.append(new_feature)


out  = {
    'type':'FeatureCollection',
    'features': features,
}

print json.dumps(out)