INSPIRE Thematic Clusters

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Elevation, Orthoimagery, Reference Systems and Geographical Grids Cluster

Elevation, Orthoimagery, Reference Systems and Geographical Grids Cluster

Owner: Jordi ESCRIU

Group members: 143

Description:

Welcome to Thematic Cluster Elevation, Orthoimagery, Reference systems, Geographical grids!

This is an open group for people involved and interested in the use, implementation, dissemination and understanding of the Thematic Cluster, comprising the themes Elevation, Orthoimagery, Coordinate reference systems, Geographical grids.

An introduction to the INSPIRE Thematic Clusters for Topographic and Cadastral Reference Data is available in the EuroGeographics website (slides and webinar recording).

In order to add discussion topics and participate in them, you need to be registered to the ECAS platform, log on to the collaboration platform and finally join the group and sub-groups you are interested in.

Please use this main group to share resources and have discussions which are common to more than one INSPIRE theme within the Thematic Cluster. For those which are specific and focused just on one of the themes, please use the separate subgroups created for such purpose.

 
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Brief description: INSPIRE Thematic Cluster Elevation, Orthoimagery, Reference systems, Geographical grids - Join this group to share your knowkledge, learn and collaborate in solving issues related to the Elevation, Orthoimagery, Reference systems and Geographical grids themes
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Theme-specific discussions (Subgroups)

  • REMINDER - TC #3 Webinar on "Implementation of INSPIRE Coverages"
  • OGC Coverage Implementation Schema (CIS) v1.1 already available
    Comments
    • 170 Views
      Emmanuel DEVYS

      Dear Jordi, and all

      I'd like to provide additional information on the CIS 1.1 Coverage model, which allows other encoding than the GML only and also additional Coverage classes as regards the ones in CIS1.0 (= GMLCOV) that is being adopted by ISO TC211 as 19123-2 Coverage Implementation Schema (CIS 1.0, based on existing ISO 19123).

      This new CIS 1.1 Coverage Implementation schema has been standardized by the OGC on basis of 3 encodings in GML, JSON and RDF, and are based on a new Coverage model (whose UML diagrams are provided in html, or other document formats such as pdf or MS word), which is different from the existing OGC AS topic 6 / ISO 19123:2005 (for which a new project has been started). Figure 16 provides a view of the integration of the previous GridCoverage, RectifiedGridCoverage and ReferenceableGridCoverage (coming from ISO 19123 and GMLCOV, and widely used in INSPIRE data specifications for Coverage-based data), and the parallel emergent (as of CIS 1.1) GeneralGridCoverage and GeneralGrid classes. This new UML Coverage model has not been provided to the OGC nor TC211 in order to secure its consistency (both internal and external with other relevant TC211 standards - such as GFM, CRS, ...). This effort has not been done (up to now) because OGC worked on a implementation standard (CIS 1.1) and UML is only informative. The validation of the new UML model has not been done by OGC (under some AS Topic 6), and not by TC211, as of the revision of 19123-1 project, nor integration in the TC211 HMMG model. Consequently, this CIS 1.1 UML model can't presently be considered as standardized, or the people doing so would do it under their own responsibility.

      As (for the GML encoding) the CIS1.1 schema (based on this new Coverage UML model) as updated/changed some Coverage concepts, the name of classes / elements and even the encoding of the coordinates, the "backward compatibility" has been achieved (in order to solve comments sent during the balloting period by IGN, DGIWG, as well as other stakeholders) by inclusion of CIS1.0 into CIS1.1 (see requirement #1 and conformance clause. In fact, the new CIS1.1 schema is not - by itself - backward compatible with CIS 1.0 schema, and the specifications provides no mapping of CIS1.0 elements to CIS1.1.

      Such a mechanism for backward is acceptable in the XML domain, but might create problems for integration in the TC211 HMMG. Therefore I would strongly recommend to consider that the UML description in this "Coverage Implementation Schema" be considered as not formally validated by OGC nor TC211.

      As a result, in the context of INSPIRE, where specifications and schemas are supposed to be derived from standardized (and validated) UML models, I would urge the involved experts and stakeholders to double-check whether the INSPIRE Coverage model has an interest to upgrade to this new model (that is not available as an EA - or equivalent), and evaluate how the existing data specifications may be upgraded / mapped to the new schemas.

       

      Hoping this helps

  • Discrete Global Grid System (DGGS) Abstract Specification approval
  • Webinar Implementation of INSPIRE Coverages
  • Webinar “Implementation of INSPIRE Coverages” When: Monday 6th November 2017, 10:30 – 12:00 CET. Where: Online webinar - Connection details: Please, access the following URL on the date and at the...
  • Workshop "Data Cubes for Big Earth Data"
  • Draft proposals to align implementation of INSPIRE Coverage data to the one foreseen in OGC (OGC-standard coverage data). Misalignments have been identified by the thematic cluster as existing INSPIRE implementation issues. To...

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Elevation, Orthoimagery, Reference Systems and Geographical Grids Cluster

Elevation, Orthoimagery, Reference Systems and Geographical Grids Cluster

INSPIRE Thematic Cluster Elevation, Orthoimagery, Reference systems, Geographical grids - Join this group to share your knowkledge, learn and collaborate in solving issues related to the Elevation, Orthoimagery, Reference systems and Geographical grids themes

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