MIWP-Action #2440

MIWP-7b: Extension of Download Service Technical Guidelines for Web Coverage Services (WCS)

Added by Michael Lutz over 4 years ago. Updated over 2 years ago.

Status:ClosedStart date:01 May 2015
Priority:NormalDue date:
Assignee:Jukka Rahkonen% Done:

100%


Description

Issue:

Many INSPIRE spatial data themes (orthoimagery, elevation, geology, atmospheric conditions/meteorological geographical features, oceanographic geographical features, soil, land cover, natural risk zones, energy resources) include data that, according to the INSPIRE data specifications, have to be made available as coverages. The ‘Habitats and Biotopes’ and Environmental Monitoring Facilities’ specifications mention that the use of coverage model should be considered once mature implementations appear.

Other data specifications such as 'Sea Regions' whilst not mandating data should be provided as coverages, would benefit from consideration within these guidelines.

The current TG for download services are based on Atom feeds (for pre-defined dataset download services) and WFS 2.0 (for pre-defined dataset and direct access download services). While coverage data can also be provided using Atom feeds or WFS, these options are not well suited for many coverage datasets, because single coverages are often several GB or even TB in size and users are typically only interested in some sub-set of the data, e.g. as defined by

  • a user-defined bounding box or time period (trimming)
  • queries that reduce the dimension of the result coverage (slicing), e.g. extracting a temperature surface at a certain depth from a 3D ocean temperature coverage.

The MIG workshop on WCS-based INSPIRE download services on 14-15 October 2014 demonstrated that all operations required by the Download Service IRs can be mapped to the WCS 2.0 standard, and that using a WCS for providing coverage data provides a number of benefits and opportunities (depending on the supported WCS extensions), e.g.

  • Data provision of model results (e.g. surfaces and grids) or multi-dimensional or multi-variable data through services
  • Advanced download
    • Queries based on filters that are not trimming and slicing, e.g. corridor selection (calculate the exposure to air pollution along a route or the air temperature along flight corridors) or a time slice of meteorological data.
    • (Server-side) advanced analyses (directly accessing the data), e.g. statistical analyses, interpolation between point values, aggregations (e.g. means, min/max, exceedances, etc.), time series analyses
  • Downloading data for visualisation purposes
    • an image coverage as-is
    • using interpolation of point clouds
    • using reclassification of range values
    • using styling as defined by the user
    • selecting a style provided by the server

The workshop also illustrated that further guidelines or best practices are needed for how to provide harmonised INSPIRE coverage data through the WCS. Such guidelines should revisit and, if required, propose updates to the encoding guidelines currently included in the data specifications.

Proposed change or action:

  • Propose and coordinate with the MIG any update of the Technical Guidance document for INSPIRE download services to include options for direct access and pre-defined download services based on WCS 2.0
  • If necessary, propose and coordinate with the MIG technical guidelines (or updates to existing technical guidelines) for the provision of coverage data in conformance with the INSPIRE data models using a WCS (including data encoding).
  • Document the current state-of-play of WCS 2.0 solutions (servers and clients) and solutions based on the deprecated WCS standard versions
  • Demonstrate the feasibility of the proposed guidelines by
    • implementing the INSPIRE extensions in at least one open source WCS 2.0 solution,
    • using this open source solution to deploy sample coverage data sets from several INSPIRE spatial data themes
    • testing interoperability of the deployed data and services with (different) client applications, including the INSPIRE geoportal
  • Establish a web space and maintain an issue tracker for questions related to the establishment of INSPIRE download services for coverage data.
  • Work in establishing which coverage formats that should be supported by the INSPIRE extension of WCS 2.0.

Liaising with the OGC WCS SWG and Coverage DWG, OSGeo and other relevant organisations and initiatives. Other relevant organization is main providers of scientific coverage data, e.g. ESA and GEOSS.

Organisational set-up:

Form a MIG sub-group including MIG representatives and experts from the pool of experts

Outcomes:

  • Updated Technical Guidelines for Download Services to include WCS
  • Technical Guidelines (or updates to existing technical guidelines) for the provision of coverage data in conformance with the INSPIRE data models using a WCS
  • Open Source INSPIRE compliant WCS 2.0 implementation(s)  based on existing mature WCS 2.0 software
  • Analysis of the impacts (e.g. costs) of implementing the updated Technical Guidelines

Possible funding:

  • UK (Defra) and H2020 (EarthServer2 project)  funding for implementation of INSPIRE/WCS open source solutions
  • JRC funding for TG editor

 


Related issues

Related to MIWP 2016-2020 - MIWP-Action #2127: 2016.3: Validation and conformity testing (previously MIW... Closed 01 Apr 2014 30 Jun 2017
Related to MIG-T - MIWP-Action #2401: MIWP-7a: Extension of Download Service TG for observation... Closed 01 Dec 2014 31 Dec 2015
Related to MIWP 2016-2020 - MIWP-Action #2136: 2016.4: Theme specific issues of data specifications & ex... Work in progress 01 Jun 2014 30 Jun 2018

History

#1 Updated by Michael Lutz over 4 years ago

  • Status changed from Proposed to Endorsed

Endorsed by written procedure on 2015-04-30

#2 Updated by Jari Reini over 4 years ago

Progress since the last meeting

Call for participation has been sent out. A couple of nominations received. The deadline is 2015-05-31.

Tasks/deliverables planned for the next month(s):

  • A first meeting in mid-June
  • State of the art (client/server) review
  • Technical editor


Overall status

On schedule. The work to be started in June.

Risks or issues for discussion in the MIG-T

One more week time for nominations.

#3 Updated by Jari Reini over 4 years ago

Progress since the last meeting

A kick-off meeting took place on June 23. Planning ongoing and minutes/activities/responsibilities to be circulated shortly.

Tasks/deliverables planned for the next month(s):

Tasks and deliverables

Overall status

On schedule. However, holiday season might cause some delay in getting activities up and running.

Risks or issues for discussion in the MIG-T

None.

#4 Updated by Jari Reini about 4 years ago

  • Description updated (diff)

Progress since the last meeting

A first virtual meeting Aug 12 with a low participation (holiday season). It was decided to propose splitting TG into several docs. Technical editor procurement ongoing.

Tasks/deliverables planned for the next month(s):

See: Tasks and deliverables

Overall status

On schedule.

Risks or issues for discussion in the MIG-T

Splitting/re-structuring TG. The proposal is here.

#5 Updated by Jari Reini about 4 years ago

Progress since the last meeting

A more detailed roadmap.

Tasks/deliverables planned for the next month(s):

See: Tasks and deliverables

Overall status

On schedule.

Risks or issues for discussion in the MIG-T

None.

#6 Updated by Jari Reini almost 4 years ago

Progress since the last meeting

Selection of the technical writer in progress.

Discussions about technical details directed to the Thematic Clusters Platform

Tasks/deliverables planned for the next month(s):

See: Tasks and deliverables

Overall status

On schedule.

Risks or issues for discussion in the MIG-T

None.

#7 Updated by Jukka Rahkonen over 3 years ago

Progress since the last meeting

Version 0.7 of updated Technical Guidelines for dowload services (task T1) is being reviewed by the experts of the sub-group (10-19 February 2016).

Tasks/deliverables planned for the next month(s):

Feedback from larger audience, for example Thematic Cluster, will be requested starting on February 23, 2016 and document should be ready for MIG-T review on March 18.

Overall status

Action is deleyed for about 4 weeks. Updated schedule for task T1 is in the minutes of meeting 6

Risks or issues for discussion in the MIG-T

No risks for further delay have been identified.

#8 Updated by Michael Lutz over 3 years ago

  • Status changed from Endorsed to Work in progress

#9 Updated by Michael Lutz over 3 years ago

Progress since the last meeting

  • Version 0.8 of updated Technical Guidelines for dowload services (task T1) taking into account comments from sub-group experts 

Tasks/deliverables planned for the next month(s)

Overall status

  • Action is deleyed for about 4 weeks. Updated schedule for task T1 is in the minutes of meeting 6
  • Work on T2 has not yet started

Risks or issues for discussion in the MIG-T

  • The current draft proposes a mapping of the "Get Spatial Object" operation to the ProcessCoverages request/response defined in the OGC Web Coverage Service WCS Interface Standard - Processing Extension, version 2.0 to allow more advanced querying (than the trimming/slicing already possible through GetCoverage requests). It is needs to be investigated how widely supported/used the proposed extension is, and whether the additional features are widely required by INSPIRE use cases/users.
  • The current draft assumes that the "Describe Spatial Object" operation is not mappable to the WCS specification.

#10 Updated by Jukka Rahkonen over 3 years ago

Progress since the last meeting

Tasks/deliverables planned for the next month(s)

  • RC2 version of Technical Guidance document reflecting the feedback from MIG-T.
  • First draft of guidelines for providing coverage data.
  • First draft document about the current state-of-play of WCS 2.0 and older versions.

Overall status

  • Project is progressing according to revisited schedule.

Risks or issues for discussion in the MIG-T

  • The current draft assumes that the "Describe Spatial Object" operation is not mappable to the WCS specification.

#11 Updated by Michael Lutz about 3 years ago

Progress since the last meeting

  • Draft resolutions for comments received during MIG-T review
  • Comment resolution meeting on 5 July to discuss critical comments
  • On-going work on v1.0rc2 for MIG-P review and endoresement

Tasks/deliverables planned for the next month(s)

  • Finalise v1.0rc2 for MIG-P review and endoresement (August)
  • First draft document about the current state-of-play of WCS 2.0 and older versions.

Overall status

  • Work on WCS download service TG is slightly behing schedule
  • Work on guidelines for providing coverage data has not yet started (no input from the group)

Risks or issues for discussion in the MIG-T

  • There has been no input from the MIWP-7b sub-group on the guidelines for providing coverage data. There is, however, considerable discussion and activities on this topic in the relevant Thematic Clusters. It may therefore be sensible to remove this task from the MIWP-7b group and ask the MIWP-14 sub-group to address it instead.

#12 Updated by Michael Lutz about 3 years ago

  • % Done changed from 0 to 70

Progress since the last meeting

  • On-going work on v1.0rc2 for MIG-P review and endoresement

Tasks/deliverables planned for the next month(s)

  • First draft document about the current state-of-play of WCS 2.0 and older versions.

Overall status

  • Work on WCS download service TG is now seriously behing schedule

Risks or issues for discussion in the MIG-T

  • How to include the planned work on the guidelines for providing coverage data in the new MIWP 2016-2020, e.g. as
    • a stand-alone action
    • part of a wider new action in relation to Copernicus (synergies with other policies)
    • as part of 2016.4 (theme-specific issues)

#13 Updated by Michael Lutz almost 3 years ago

  • % Done changed from 70 to 90

Progress since the last meeting

  • v1.0rc2 has been completed and is ready for MIG-P review and endorsement (#2738)

Tasks/deliverables planned for the next month(s)

  • First draft document about the current state-of-play of WCS 2.0 and older versions.

Overall status

  • Work on WCS download service TG is completed

Risks or issues for discussion in the MIG-T

  • How to include the planned work on the guidelines for providing coverage data in the new MIWP 2016-2020, e.g. as
    • a stand-alone action
    • part of a wider new action in relation to Copernicus (synergies with other policies)
    • as part of 2016.4 (theme-specific issues)

#14 Updated by Michael Lutz over 2 years ago

Progress since the last meeting

Tasks/deliverables planned for the next month(s)

  • none

Overall status

  • The work of the action/sub-group has been completed.

Risks or issues for discussion in the MIG-T

  • Are any major comments expected from France?

#15 Updated by Michael Lutz over 2 years ago

  • Status changed from Work in progress to Closed
  • % Done changed from 90 to 100

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