Output a GeoJSON FeatureCollection to file from dict point data input

output_geojson.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""
output geojson.py
Created by Stephan Hügel on 2015-02-26

I can *never* remember how to efficiently do this, so I'm making a gist.
This should be easily adaptable to use with LineStrings, Polygons etc by
altering the 'geometry' dict accordingly

"""
import json

def make_feature(lon, lat, **kwargs):
    """Create a Point and convert it into a dict suitable for GeoJSON output"""
    return {
        'type': 'feature',
        'properties': {
            'name': kwargs.get('location_name') or ""},
            'geometry': {
                'coordinates': (float(lon), float(lat)), 'type': 'Point'},
            'description': kwargs.get('description') or ""
        }

def make_collection(features):
    """Return a FeatureCollection dict"""
    return {
    "type": "FeatureCollection",
    "features": [
        make_feature(
            f['lon'],
            f['lat'],
            )
        for f in features],
    "crs": {
        "type": "name",
        "properties": {
            "name": "urn:ogc:def:crs:OGC:1.3:CRS84" }
        }
    }

def write_geojson(fname, coll):
    """Dump GeoJSON FeatureCollection to file"""
    with open(fname, 'w') as f:
        f.write(json.dumps(coll, indent=4, separators=(',', ': ')))

# totally made up example collection of point dicts from somewhere
things = [{'lon': '0.0', 'lat': '0.1'}, {'lon': '0.1', 'lat': '0.2'}]
write_geojson('test.geojson', make_collection(things))