1. Ontology based Collection Discovery
C. Iacopino ESA EOP-G
P.G. Marchetti ESA EOP-G
Slide 1

2. Table of Content Overview Geospatial Context CIM Extension
Keywords and Ontologies
Automatic Link Ontology-Collection
Conclusion
Slide 2 2

3. Catalogue Service for Web
ISO 19115
ISO 19119
CSW
ebRIM
CSW ebRIM AP
CIM EP
EO EP
GML
EO GML AP
Collection
Service
Product
CSW ISO
ISO 19139
XML Schema Implementation
Slide 3

4. Catalogue Service for Web
ISO 19115
ISO 19119
CSW
ebRIM
CSW ebRIM AP
CIM EP
EO EP
GML
EO GML AP
Collection
Service
Product
CSW ISO
ISO 19139
XML Schema Implementation
Slide 4

5. ebRIM ISO CSW (CIM EP)
Mapping between information resources and metadata
OGC r2, OGC Cataloguing of ISO Metadata (CIM) using the ebRIM profile of CS-W, Discussion Paper, v

6. Catalogue Service for Web
ISO 19115
ISO 19119
CSW
ebRIM
CSW ebRIM AP
CIM EP
EO EP
GML
EO GML AP
Collection
Service
Product
CSW ISO
ISO 19139
XML Schema Implementation
Slide 6

7. EO Products Extension Package
GML EO Products data
Earth Observation context
OGC r5, EO Products Extension Package for ebRIM Profile of CSW 2.0, version 0.2.2,

8. EO Products Data Model EO Product Types taxonomy
+parentIdentifier
EO Product Types taxonomy
Container to store the observation metadata and the acquisition parameters
OGC r5, EO Products Extension Package for ebRIM Profile of CSW 2.0, v ,

9. Discovery Process
Slide 9

10. Table of Content Overview Geospatial Context CIM Extension
Keywords and Ontologies
Automatic Link Ontology-Collection
Conclusion
Slide 10 10

11. Extension Goals Goals Approach proposed
Improve the capabilities of the discovery process of EO resources
Allow non-expert users to find collections and products that fit their needs
Approach proposed
Semantic annotation by means of keywords referenced to formal ontologies

12. <<ExtrinsicObject>> Keywords
CIM Extension
<<ExtrinsicObject>>
CitedItem
<<ExtrinsicObject>> Keywords
1..*
DescriptiveKeywords
ThesaurusName 1
<<ExtrinsicObject>>
ResourceMetadata
description : InternationalString
<<classification>> ObjectType[0..*] : ObjectReff
<<slot>> Source[0..*] : InternationalString
<<slot>> Format[0..*] : FormatNameAndVersion
<<slot>> References[0..*] : URI
<<slot>> Type[0..*] : InternationalString
ResourceMetadataInformation
ParentMetadataInformation
0..1
0..1
0..1
0..1
<<ExtrinsicObject>>
MetadataInformation
<<slot>> date : DateTime
<<slot>> Identifier [0..1] : String
<<slot>> Language [0..1] : Language
<<classification>> CharacterSet[0..1]
<<slot>> ConformsTo[0..1] : MetadataStandardNameAndVersion
Slide 12

13. Keywords Entity
CIM
ISO 19115

14. Keywords in Inspire INSPIRE Metadata Implementing
Rules: Technical Guidelines based
on EN ISO and EN ISO 19119, v. 1.0,

15. Table of Content Overview Geospatial Context CIM Extension
Keywords and Ontologies
Automatic Link Ontology-Collection
Conclusion
Slide 15 15

16. Collection discovery via the OTEG ontology
OTEG GUI
Keywords
CSW
Collections Request

17. Example: OTEG ontology
Search Engine
Ontology Navigation
Vocabulary
Concept Definition

18. Example: OTEG ontology (2)
ESA:ESA.EECF.LANDSAT_TM_xF

19. Collection discovery via multiple ontologies
GEMET Ontology
GUI
OTEG Ontology
B-Keywords
CSW
A-Keywords
Collections Request

20. Table of Content Overview Geospatial Context CIM Extension
Keywords and Ontologies
Automatic Link Ontology-Collection
Conclusion
Slide 20 20

21. The Automatic Link Problems Approach proposed
The ontology concepts have to be transferred to the catalogue.
Have the possibility to link collections dynamically to a number of ontologies/thesauri could improve considerably the discovery process.
Approach proposed
Identify which are the characteristics of the collection that consent to link them to the thematic area represented by the ontology.
The main element that differentiates a collection respect the others is the sensor that acquired the datasets.

22. <<ExtrinsicObject>> Instrument
Instrument Entity
<<ExtrinsicObject>> ResourceMetadata
AcquisitionInformation 1
<<ExtrinsicObject>> DataMetadata
<<classification>> SpazialRepresentaionType [0..*]
<<slot>> ScaleDenominator [0..*]: Integer
<<slot>> Language [0..*]: Language
<<classification>> TopicCategoryCode [0..N]
<<slot>> Temporal [0..N]: GM_Period
<<slot>> Spatial [0..N]: GM_Envelope
<<ExtrinsicObject>> Instrument
<<classification>> Band [1..*] : BandTypeCode
<<slot>> Resolution [1..*]: gml:MeasureType
<<slot>> Description [0..1]: String
<<slot>> Mode [0..*]: String
<<slot>> Polarisation [0..*]: String
Landsat TM
Res: 30 m
Band: Mult. - Swift
ESA:ESA.EECF.LANDSAT_TM_xF

23. Collection discovery via automatic link
Res: m
Band: Mult-Swift
OTEG Ontology
Land Use
OTEG GUI
Keywords
Res: m
Band: Mult-Swift
CSW
Collections Request
ESA:ESA.EECF.LANDSAT_TM_xF

24. Collection discovery via mediator service
B-Ontology
GUI
A-Ontology
B-Keywords
CSW
A-Keywords
Collections Request

25. Mediation - Example Ontology O1 Ontology O2 Person Human
name
age
Human
- name
michael memberOf Person
name = Michael Stollberg
age = 28
Adult
Child
classMapping(unidirectional O2:Person O1.Adult attributeValueCondition(O2.Person.age >= 18))
This allows to transform the instance ”michael” of concept person in ontology O2 into a valid instance of concept ‘adult’ in ontology O1

26. Table of Content Overview Geospatial Context CIM Extension
Keywords and Ontologies
Automatic Link Ontology-Collection
Conclusion
Slide 26 26

27. Conclusion
The approach proposed regarding the Keywords entity is a feasible solution in terms of the adoption effort required.
Work to do
Investigate in depth the right subset of sensor attributes required and which technology use in the implementation (ebRIM entities or external annotation in SensorML).
Slide 27

28. Thank you for the attention
Slide 28