Image Georeferencing Service and Image Georeferencing Metadata Standards Working Group (IGS-IGM SWG)

 

1.    IGS-IGM SWG

 

2.    Purpose of this Standards Working Group

The IGS-IGM SWG will shepherd two OGC candidate standards through adoption as OGC Standards: OpenGIS® Image Georeferencing Service (IGS) (OGC 07-030r2, "IGS" for short) and OpenGIS® Image georeferencing me...

 

1.    IGS-IGM SWG

 

2.    Purpose of this Standards Working Group

The IGS-IGM SWG will shepherd two OGC candidate standards through adoption as OGC Standards: OpenGIS® Image Georeferencing Service (IGS) (OGC 07-030r2, "IGS" for short) and OpenGIS® Image georeferencing metadata GML 3.2 application schema (IGM) (OGC 07-031r2, "IGM" for short). The SWG will carry out the work required until these candidate standards become OGC standards. As this point approaches, the SWG will decide whether it ought to persist and, if it so decides, it will take appropriate steps; otherwise, it will be disbanded when the two candidate standards become full standards.

3.    Scope of Work

The IGS-IGM SWG will begin its work with the two OGC candidate standards referenced above, IGS and IGM. Earlier forms of these candidate standards entered the RFC process in 2006 and were shepherded by a Revision Working Group in 2007. No comments emerged in the public comment period during the RFC process, but the RWG generated some Change Requests. The RWG modified the documents based on these Change Requests and the resulting candidate standards, which are the documents referenced in full in section 2 of this document, entered the OGC Electronic Voting procedure in February 2008, with a closing date of 16 April 2008. The voting period was subsequently extended, but the e-vote was inconclusive and it was agreed at TC Plenary Session on 5 June 2008 that the adoption votes failed due to lack of a quorum. The submission team determined, however, based on the experiences gained during implementation attempts, that additional changes to these candidate standards need to be addressed. There is also an issue of complexity.

It is inferred from the Electronic Voting results and from both the preceding OGC process and various informal comments, that IGS and IGM are deemed desirable by the prospective user community, so work on them should continue, i.e. they should not be abandoned.

The SWG, therefore, will solicit and receive Change Requests, resulting in further modifications to the documents. It will consequently revise the candidate standards, vote on them and recommend them to OGC TC. It is hoped that TC will then submit them to the Electronic Voting process. If the voting is successful, the candidate standards become OGC Adopted Standards. The SWG will decide whether it ought to persist and, if it so decides, it will take appropriate steps; otherwise, it will be disbanded when the two candidate standards become full standards. If the voting is unsuccessful, the SWG must determine and undertake the necessary steps to revise the documents and re-submit them once again.

3.1       What is out of scope?

Unless the SWG elects to become persistent, as suggested in section 3 above, work beyond version 1.0 of the OGC Adopted Standards is not within the scope.

3.2       Specific Contribution of Existing Work as a Starting Point

In addition to the candidate standards themselves, it is anticipated that one or more Change Requests will have been posted as Pending Documents by the time the SWG comes into being.

3.3       How it is to be Determined when the Work of the SWG has been Completed?

The IGS-IGM SWG will dissolve after the following three milestones have been achieved:

  1. The SWG has completed evaluation and incorporation into the candidate standard of all Change Requests.
  2. Approval by the SWG membership of a recommendation to submit the documents to the TC for consideration as OGC Adopted Standards.
  3. The candidate standards have been approved by the OGC Technical and Planning Committees as Adopted OGC standards.

4.    Description of deliverables

The SWG will submit revised candidate standards to the TC for consideration as OGC Adopted Standards: OpenGIS® Image Georeferencing Service (IGS) (tentatively OGC 07-030r3, version 1.0.0) and OpenGIS® Image georeferencing metadata GML 3.2 application schema (IGM) (tentatively OGC 07-031r3, version 1.0.0).

Should these revisions necessitate changes to GML 3.2.1, appropriate steps will be taken to feed these into the GML 3.2.1 revision process.

Since it is felt that the bulk of the work on IGS and IGM has already been completed, an aggressive schedule is proposed: if the SWG is approved at the December '08 OGC Technical Committee Meeting in Valencia on 1-5 December 2008, regular meetings will be held starting immediately thereafter, with a view to submitting the revised candidate standards to TC in time for either the summer or autumn 2009 OGC Technical Committee Meeting (details to be determined).

5.    IPR Policy for this SWG

ý RAND-Royalty Free.  ?  RAND for fee

6.    Anticipated Participants

It is anticipated that the SWG will consist of at least one employee from BAE Systems, which has been working on draft Change Requests to IGM as well as on implementation. Otherwise, eligible persons, as defined on the first page of this document, who have an interest in image georeferencing, are welcome to join. This could include persons interested in triangulation, error propagation, metadata, image transfer standards and GML application schemas.

7.    Other informative information about the work of this SWG


a. Similar or applicable standards work (OGC and elsewhere).
OGC OpenGIS® Geography Markup Language (GML) Encoding Standard (OGC 07-036, Version 3.2.1, 27 August 2007)

OGC 08-008r5, OpenGIS® Abstract Specification Proposed Topic 19: General Reference Systems

OGC 08-015 (ISO 19111:2007 with corrections), The OpenGIS® Abstract Specification Topic 2: Spatial referencing by coordinates

ISO 19111-2, Geographic information - Spatial referencing by coordinates - Part 2: Extension for parametric values

The SWG intends to seek and if possible maintain liaison with each of the organizations maintaining the above works.

b. Details of the first meeting

The first meeting of the SWG will be held by telephone conference call at 10AM EDT on Wednesday 17 December 2008. Call-in information will be provided to the SWG's e-mail list and on the portal calendar in advance of the meeting.

c. Projected on-going meeting schedule

The work of the SWG will be carried out primarily by email and conference calls, possibly every two weeks, with face-to-face meetings at all OGC Technical Committee Meetings.
 
d. Supporters of the Proposal

The following people support this proposal and are committed to the Charter and projected meeting schedule. These members are known as SWG Founding or Charter members. Once the SWG is officially activated, this group is immediately "opted-into" the SWG and has voting rights from the first day the SWG is officially formed.

Name

Organization

Stewart Walker

BAE Systems (voting)

Mike Botts

University of Alabama, Huntsville

Jim Greenwood

SeiCorp

Neil Sunderland

SeiCorp (non-voting)

Arliss Whiteside

BAE Systems (non-voting)

[other names to follow]

 

 

 
e. Convener(s)

Stewart Walker, BAE Systems, is proposed as the Convener of the IGS-IGM SWG.