Use of JSON-FG extensions in the Route Exchange Model

[cportele]

From the discussion during the September 2021 Member Meeting:

Some of the JSON-FG extensions could be useful for clients parsing a route, in particular:

• A member "when" for the time interval associated with a route or route segment;
• The member "featureType" to identify the type of the feature in a route (overview, segment, start, end).

[cportele]

From a discussion in the Routing Pilot Sprint:

The REM has four feature types that can be instantiated: overview, start, end and segment. Currently the type is indicated using a member type inside the GeoJSON properties object. For the GeoJSON representation it does make sense to keep the information in the properties object, because this is where GeoJSON software will expect it. However, it would make sense to change the member key from type to featureType, both to align with the JSON-FG naming convention and to avoid confusion with the GeoJSON use of type for Feature etc.