Get the latest federated observation for a Station. This observation is made from the latest device observations that belong to the station. If a user has multiple devices of the same type they are able to designate one of them as primary. This primary device is the one used to make the federated observation.
A user can also designate each device as either indoor or outdoor. All indoor observation value fields will end with an _indoor suffix. Outdoor observations fields do not have a suffix.
The station_units values represent the units of the Station's owner, not the units of the observation values in the API response.