Support reverse geocoding?

[maurizi]

We'd like to be able to make authenticated Esri reverse geocoding requests in OpenTreeMap.

Authentication with the Esri geocoding APIs is somewhat complicated, and since we plan to support it for geocoding, it would be nice to lean on that infrastructure for reverse geocoding as well.

Do we want to support reverse geocoding at all in this library? Would a new library dedicated to reverse geocoding be more appropriate?

Assuming we do add support for reverse geocoding, it raises a lot of API questions:

• Are there any desired pre/post processors for reverse geocoding?
• Would reverse geocoding use the same service settings as geocoding? The API keys will be the same for a given service, but desired pre/post processors would likely be different for reverse geocoding than they are for normal geocoding.
• Do we add a separate ReverseGeocoder class, as a companion to Geocoder? Or do we add a reverse_geocode method to Geocoder?
• What services would we like to to support reverse geocoding in besides EsriWGS?