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Isochrone

Isochrone API that provides a functionality of calculating isochrones (walking areas).

Install:

  1. Download graph for regions where you need to calculate isochrones. Download .osm.pbf files from http://download.geofabrik.de/.
  2. Put your .osm.pbf. files under containers/app/osm/pbf directory (currently there is rutland-latest.osm.pbf for illustration reasons, remove it if you don't need this area).
  3. Run docker-compose up --build (Hints on how-to install docker and docker-compose)

Then, you'll need to wait until graph is uploaded to DB. During upload, you might see messages like this docker-compose logs app:

[|                                   ] (1%) Total processed: 20000        Vertices inserted: 58672       Split ways inserted 53186
[*|                                  ] (3%) Total processed: 40000        Vertices inserted: 48981       Split ways inserted 46608
[**|                                 ] (5%) Total processed: 60000        Vertices inserted: 46003       Split ways inserted 43317
[***|                                ] (6%) Total processed: 80000        Vertices inserted: 33135       Split ways inserted 34595
[****|                               ] (8%) Total processed: 100000       Vertices inserted: 16320       Split ways inserted 18170

When API is ready you'll see message like this docker-compose logs app:

* Serving Flask app "app" (lazy loading)
* Environment: production
WARNING: This is a development server. Do not use it in a production deployment.
  Use a production WSGI server instead.
* Debug mode: off
* Running on http://0.0.0.0:1769/ (Press CTRL+C to quit)

Usage:

In order to calculate isochrone you need to pass 3 query parameters to API:

  1. X (float) - Longitude of a point for which you want to calculate walking area.
  2. Y (float) - Latitude of a point for which you want to calculate walking area.
  3. sec (integer) - Number of seconds (600 - 10 minute walking area, 300 - 5 minute walking area, etc.)

Example:

import requests

url = 'http://localhost:1769/isochrone?'

params = {'X': -0.1946611966680779, 'Y': 51.46534965585685, 'sec': 300}
resp = requests.get(url, params=params)

print(resp.json())
POLYGON((-0.200436112629018 51.4667218592721,-0.200446733267529 51.4667235969986,-0.200460738988607 51.466725888585,-0.200490282193392 51.4667307223818, ...))

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