1. Environmental Linked Features Interoperability Experiment
OGC ELFIE
Environmental Linked Features Interoperability Experiment

2. Context
Data from sensors becoming ubiquitous (IoT), defined as ‚spatial data‘ (see COM(2017) 9)
Diverse thematic data models being developed, but no common approach as to interlinkage between observational data and domain features
OGC Metadata (CSW, WFS & SOS Capabilities) not indexed by standard search engines  reduces uptake
Relationships to domain features (i.e. rivers, aquifers, or soils) relevant for data discovery and use (in addition to location)
Linked Data approach requires standardisation of such relationships for cross system sharing

3. Real World Requirements
Agriculture: Access values from different stations (soil moisture, soil temp, water level in aquifer and related river) to know when to irrigate crops
Emergency Response: Access values from different stations (groundwater level, river gauges, precipitation) to understand and predict flooding patterns

4. Real World Requirements
Drought: Feed HydroGeoUnit with groundwater level, river gauges, precipitation to predict drought situations
WaterQuality: Describe link between ground / surfacewater (including watersheds) with their respective monitoring information to understand impacts

5. Environmental Linked Features Interoperability Experiment (ELFIE)
Objectives:
Demonstrate integration of environmental observation data with domain features (ReSTful and Linked Data principles)
Prepare OGC engineering report on interlinkages identified between observation data and domain features
Provide draft linked data encodings to relevant standards working groups

6. ELFIE Methodology
Define specific technical criteria to test hypothesis
Refine use cases and select source data
Select and/or draft linked data encodings to be used
Encode documents for each use case
Evaluate documents against predefined criteria
Write engineering report

7. ELFIE Use Cases River Monitoring and Flooding Irrigation
Ground Water / Surface Water Impacts
Hydrologic Drought
Water Quality
?Air Quality?

8. ELFIE Use Case Example Hydrologic Drought HydrogeoUnit models
Linked Data Document
Groundwater
Level
Query
WaterBody
Level
Precipitation

9. ELFIE View approach Rest operations or graph views
Default encoding will be JSON-LD
Draft predicates to be provided in responses:
Basic
URI
rdfs:type, rdfs:label
Preview
rdfs:comment, dcterms:creator,
geo:hasGeometry, …
Network
Net-basic
Net-temporal
Net-spatial
skos:related, …
time:after,
time:intervalDuring…
geo:sfIntersects, …

10. INSPIRE Relevance Links from Domain Features to Observations
EF: EMF hasObservation
OF/SR: PointObservationCollection; MarineContour sourceObservations
SD: SpeciesDistributionUnit observations
AC/MF: Purely Observations
AQD: Air quality attainment/exceedance
Links from Observations to Domain Features
D2.9 defines linking to monitoring facility / network
Further relevant Domain Features
GE : (especially for hydrogeology) and AM (Area Management), HY (we’ll expose EF monitoring rivers)

11. Schedule
May Formal kickoff after 30-day participant notification period
June Use Cases Finalized, face to face at HDWG and Summer TC
September Evaluation complete, demonstration at fall TC
December IE complete, final document submitted

12. Participate! Provide (input) for Use Cases, Data Models, Data
Assure INSPIRE requirements met
Only few EU representatives! 
David Blodgett:
Grellet Sylvain:
Kathi Schleidt:

13. Links http://www.opengeospatial.org/projects/initiatives/elfie