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w3c / sdw-sosa-ssn

Repository of the Spatial Data on the Web Working Group for the SOSA/SSN vocabulary
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Worked examples using hasUltimateFeatureOfInterest #11

Closed dr-shorthair closed 4 years ago

dr-shorthair commented 6 years ago

@smrgeoinfo and @denevers can you help?

denevers commented 6 years ago

I'll need some catch-up reading first...

KathiSchleidt commented 6 years ago

In the Water domain, I see samplingFeature FoIs requiring a contextual link as UFoI (nice that we've finally managed to integrate UFOs ;) ) to:

In Biodiversity, the speciesObservationPoint could also go to something larger, but still semantically chewing on what that would be. First bang is the population of a specific area, i.e. a protected site or survey area; not clear how this is related to the site itself yet...

In air quality things are a bit too ethereal, but meteo could be worth exploring as they have other features they may wish to relate to (prevailing currents, also some radiation cloud examples tickling the back of my brain)

sgrellet commented 6 years ago

Lets give a quick try for 'Groundwater level monitoring'. Observation -> timeSeries Observation.FoI=Well (or Piezometer attached to it) ObservationUFoI=The Aquifer

Does that help or do you need a more detailed example ?

denevers commented 6 years ago

@sgrellet , wouldn't the UFoi be the groundwater body ?

sgrellet commented 6 years ago

@denevers : conceptually and according to GWML2 model I would say yes. But we don't differentiate in our information system the Aquifer from the groundwater body it contains. I remember that during GWML2 spec phase it was the same for the other agencies involved.

We could have the same discussion 'surface water level monitoring' Observation -> timeSeries Observation.FoI=RiverGage ObservationUFoI=The River segment monitored. Here according to HY_Feature we should monitor the HY_Waterbody contained in the corresponding HY_Channel but most of the blue line networks that I know of don't differentiate those 2 guys

denevers commented 6 years ago

@grellet. point taken

smrgeoinfo commented 6 years ago

Here's a diagram showing a cascade of sampling events with different ultimate features of interest sampling-featureofinterestrelations

I haven't tried the rdf encoding for this.

dr-shorthair commented 6 years ago

The rules in the draft spec say that if a UFoI is not provided explicitly, then the UFoI can be inferred by following the chain of isSampleOf links until you get to a feature that doesn't have one. But this is always overridden (I hesitate to say 'trumped') if an explicit UFoI is indicated. So I think the 'different UFoI' case illustrated by @smrgeoinfo is accommodated by the proposal.

The intentionality indicated by the UFoI is associated with the act of observation, not with the act of sampling.

dr-shorthair commented 4 years ago

I believe the worked examples now in the document and also in the RDF folder resolve this issue