Re: [sdw] Proposal: SSN-Extensions ontology


That may actually be something that is missing from the ObservationCollection proposal. Neither Datastream nor ObservationCollection provides the complex or arrayed set of results that a Multidatastream does. 

An alternative in SensorThings is a dataArray result for an observations request:

"In SensorThings services, users are able to request for multiple Observation entities and format the entities in the dataArray format. When a SensorThings service returns a dataArray response, the service groups Observation entities by Datastream or MultiDatastream, which means the Observation entities that link to the same Datastream or the same MultiDatastream are aggregated in one dataArray.”

Potentially a service implementing ObservationCollection can request an array form of the observation members to an ObservationCollection, but that entity won’t independently have its own dataArray property as a MultiDatastream does. Not sure, of course, whether a MultiDatastream is a better option than the multiple Observations as dataArray response option.

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Received on Friday, 23 March 2018 14:04:04 UTC