1. EuroGeographics Workshop Network Service, Paris, 2008-02-05/06 Download services Olaf Østensen Network Services Drafting Team

2. EuroGeographics Workshop Network Service, Paris, 2008-02-05/06 Article 11 1. Member States shall establish and operate a network of the following services for the spatial data sets and services for which metadata have been created in accordance with this Directive: (a)… (c) download services, enabling copies of spatial data sets, or parts of such sets, to be downloaded and, where practicable, accessed directly; (d) … Directive text

3. EuroGeographics Workshop Network Service, Paris, 2008-02-05/06 Article 5 1. Member States shall ensure that metadata are created for the spatial data sets and services corresponding to the themes listed in Annexes I, II and III, and that those metadata are kept up to date. … Directive text Article 11 1. Member States shall establish and operate a network of the following services for the spatial data sets and services for which metadata have been created in accordance with this Directive: (a)… (c) download services, enabling copies of spatial data sets, or parts of such sets, to be downloaded and, where practicable, accessed directly; (d) … What does ”where practicable” mean?

4. EuroGeographics Workshop Network Service, Paris, 2008-02-05/06 2) “spatial data” means any data with a direct or indirect reference to a specific location or geographical area; 3) “spatial data set” means an identifiable collection of spatial data; 4) “spatial data services” means the operations which may be performed, by invoking a computer application, on the spatial data contained in spatial data sets or on the related metadata; Definitions

5. EuroGeographics Workshop Network Service, Paris, 2008-02-05/06 Definitions Dataset –one or more physical files serialized in an encoding format –database realized in a concrete database system –part of one of the above specified by some filter (query, … )

6. EuroGeographics Workshop Network Service, Paris, 2008-02-05/06 Modelling principle - MDA Model Driven Architecture

7. EuroGeographics Workshop Network Service, Paris, 2008-02-05/06 Simplified picture Member state data Harmonised MS data – real or ’virtual’ Download File File w/filter WFS WCS Harmonised GML schemas

8. EuroGeographics Workshop Network Service, Paris, 2008-02-05/06 Important background documents D2.5 DT DS Generic Conceptual Model D2.6 DT DS Methodology for the development of data specifications D2.7 DT DS Guidelines for the encoding of spatial data

9. EuroGeographics Workshop Network Service, Paris, 2008-02-05/06 New requirements from D2.7 - i) NB! Numbering is wrong – due to copying

10. EuroGeographics Workshop Network Service, Paris, 2008-02-05/06 New requirements from D2.7 - ii) NB! Numbering is wrong – due to copying

11. EuroGeographics Workshop Network Service, Paris, 2008-02-05/06 New requirements from D2.7 - iii) NB! Numbering is wrong – due to copying

12. EuroGeographics Workshop Network Service, Paris, 2008-02-05/06 Generic use case Workflow Discover using a discovery service on metadata Select desired dataset(s) Apply filter – F – for identifying part of selected datasets (if appropriate) Download using one or more download services defined by the implementing rule

13. EuroGeographics Workshop Network Service, Paris, 2008-02-05/06 Metadata catalogue Discover Archives Repositories discovery service Select Filter, query Download filter ‘service’ download service selection process – not specified network

14. EuroGeographics Workshop Network Service, Paris, 2008-02-05/06 Tools discovery service- DT-NS harmonized application schemas- DT-DS filter encoding- OGC/ISO web feature service- OGC/ISO GML- OGC/ISO web coverage service- OGC ftp- and http-protocol- IETF web services- W3C

15. EuroGeographics Workshop Network Service, Paris, 2008-02-05/06 More precise … Document Reference 1RFC 2616 Hypertext Transfer Protocol -- HTTP/1.1 2RFC 2818 HTTP Over TLS 3RFC 959 File Transfer Protocol 4ISO/CD 19142, Geographic information - Web Feature Service (also ISO/TC 211 N2128) current joint draft between OGC and ISO/TC 211 under ballot to become DIS by March 4, 2007 5ISO/CD 19143, Geographic information - Filter encoding (also ISO/TC 211 N2143) current joint draft between OGC and ISO/TC 211 under ballot to become DIS by April 10, 2007 6OpenGIS® Implementation Specification - Web Coverage Service (WCS) Implementation Specification Version: 1.1.0

16. EuroGeographics Workshop Network Service, Paris, 2008-02-05/06 Download Implementing Rule 1 Full dataset download based upon discovery –normally implemented through a discovery client –find, select, download using http –need to find out exactly what needs to be specified and how Variant: direct ftp or http on a directory of a repository (?)

17. EuroGeographics Workshop Network Service, Paris, 2008-02-05/06 IR 1 – Full dataset download

18. EuroGeographics Workshop Network Service, Paris, 2008-02-05/06 Encoding – only GML? It is required that the server provide the relevant MIME- type, e.g. in the case of a GML 3.2.1 dataset, MIME type text/xml; subtype=gml/3.2.1, Discussion: Should dataset formats be restricted to an INSPIRE basket of different formats. I guess this is in the hands of DT-DS? This implementing rule is very naïve in a way, but I am unsure to what extent we need to go into technicalities for this type of service that we all do every day, and which is intrinsically built into our computing environments.

19. EuroGeographics Workshop Network Service, Paris, 2008-02-05/06 Download Implementing Rule 2 Partial dataset download based upon discovery and filter As the previous but with addition of a filter condition using FE –reliant upon FE and harmonized application schema –do we need a simplified FE (profile), e.g. independent of harmonized application schema –do we need this rule at all?

20. EuroGeographics Workshop Network Service, Paris, 2008-02-05/06 IR 2 – Partial file download

21. EuroGeographics Workshop Network Service, Paris, 2008-02-05/06 Download Implementing Rule 3 Partial (extreme case: full) download based upon WFS including FE –FE specification input based on harmonized application schema –GML output according to harmonized application schema –profiling based on CRSes ??

22. EuroGeographics Workshop Network Service, Paris, 2008-02-05/06 Nota Bene Web Feature Service is under development in a joint OGC – ISO/TC 211 effort, leading to ISO 19142 – parallell voting in CEN Similar for Filter Encoding, leading to ISO 19143 ISO 19142 and ISO 19143 will with almost certainty become ENs – i.e. European standards It is currently under consideration which versions the IR will be based upon

23. EuroGeographics Workshop Network Service, Paris, 2008-02-05/06 Proposal: IR require only basic WFS – probably not sufficient due to new requirements from D2.7 It shall be required that the server supports – and reports in the getCapabilities – the same set of SRS that is required for the View service. It is thus required that the server can transform to these SRS’es on the fly. IR basis

24. EuroGeographics Workshop Network Service, Paris, 2008-02-05/06 New version ? BasicWFSTransactional WFS GetCapabilitiesYes DescribeFeatureTypeYes GetPropertyValueYes GetFeatureYes TransactionNoYes LockFeatureNoYes GetFeatureWithLockNoYes IR basis

25. EuroGeographics Workshop Network Service, Paris, 2008-02-05/06 Download Implementing Rule 4 Partial (extreme case: full) download based upon WCS including FE –FE specification input based on harmonized application schema –GML output according to harmonized application schema –profiling based on CRSes

26. EuroGeographics Workshop Network Service, Paris, 2008-02-05/06 To SOAP or not to SOAP … SOAP is not relevant for file download ISO/CD 19142 (latest revision) contains a fragmentary description of SOAP binding in an informative annex (the same applies for WFS 1.1.0 clause 6.7) SOAP and GML – a problem? So … ??

27. EuroGeographics Workshop Network Service, Paris, 2008-02-05/06 Next steps in the Work Programme DeliverablesDescriptionMilestoneWho NS - D 3.7Discovery and View services SDIC/LMO Consultation2007 – 12DT Final Draft IR2008 – 03CT Adoption of IR2008 – 05Comitology NS - D 3.9Download services SDIC/LMO Consultation2008 – 03DT Final Draft IR2008 – 07CT Adoption of IR2008 – 11Comitology NS - D 3.10 Coordinates Transformation Services SDIC/LMO Consultation2008 – 03DT Final Draft IR2008 – 07CT Adoption of IR2008 – 11Comitology