4.3 KiB
Geocoders
Geocoding is the ability to match an input string representing a location - such as an address - to geographical coordinates. Reverse geocoding is logically the opposite, matching geographical coordinates to names of places.
This is needed to set correct address for events, and more easily find events with geographical data, for instance if you want to discover events happening near your current position.
However, providing a geocoding service is quite expensive, especially if you want to cover the whole Earth.
!!!note To give an idea of what hardware is required to self-host a geocoding service, we successfully used Addok, Pelias and Mimirsbrunn on a 8 core/16GB RAM machine without any issues on French data.
List of supported geocoders
This is the list of all geocoders supported by Mobilizon. The current default one is Nominatim and uses the official OpenStreetMap instance.
!!! bug
Changing geocoder through .env configuration isn't currently supported by Mobilizon.
Instead you need to edit the following line in config.prod.exs:
elixir config :mobilizon, Mobilizon.Service.Geospatial, service: Mobilizon.Service.Geospatial.Nominatim
And change Nominatim to one of the supported geocoders. This change might be overwritten when updating Mobilizon.
Nominatim
Nominatim is a GPL-2.0 licenced tool to search data by name and address. It's written in C and PHP and uses PostgreSQL. It's the current default search tool on the OpenStreetMap homepage.
!!! warning When using the official Nominatim OpenStreetMap instance (default endpoint for this geocoder if not configured otherwise), you need to read and accept the Usage Policy.
Several companies provide hosted instances of Nominatim that you can query via an API, for example see MapQuest Open Initiative.
Addok
Addok is a WTFPL licenced search engine for address (and only address). It's written in Python and uses Redis. It's used by French government for adresse.data.gouv.fr.
!!! warning
When using France's Addok instance at api-adresse.data.gouv.fr (default endpoint for this geocoder if not configured otherwise), you need to read and accept the GCU (in French).
Photon
Photon is an Apache 2.0 licenced search engine written in Java and powered by ElasticSearch.
!!! warning The terms of use for the official instance (default endpoint for this geocoder if not configured otherwise) are simply the following: > You can use the API for your project, but please be fair - extensive usage will be throttled. We do not guarantee for the availability and usage might be subject of change in the future.
Pelias
Pelias is a MIT licensed geocoder composed of several services written in NodeJS. It's powered by ElasticSearch.
There's Geocode Earth SAAS that provides a Pelias API. They offer discounts for Open-Source projects. See the pricing.
Mimirsbrunn
Mimirsbrunn is an AGPL-3.0 licensed geocoding written in Rust and powered by ElasticSearch.
Mimirsbrunn is used by Qwant Maps and Navitia.
Google Maps
Google Maps is a proprietary service that provides APIs for geocoding.
They don't have a free plan, but offer credit when creating a new account. See the pricing.
MapQuest
MapQuest is a proprietary service that provides APIs for geocoding.
They offer a free plan. See the pricing.
More geocoding services
Geocoding implementations are simple modules that need to implement the Mobilizon.Service.Geospatial.Provider behaviour, so feel free to write your own!