MOC 2.0 Proposed Recommendation: Request for CommentsContents
SummaryMOC 2.0 describes the Multi-Order Coverage map method (MOC) to specify arbitrary coverages for sky regions and/or time coverages and potentially other dimensions. The goal is to be able to provide a very fast comparison mechanism between coverages. The mechanism is based on a discretization of space and time dimensions. The system is based on the definition of a specific storage of the map coverage using predefined cells hierarchically grouped which makes it easy to produce and use for exploring astronomical collections. Latest version of MOC 2.0 can be found at:Changes since 1.1MOC 1.1 dealt only with spatial coverage. MOC 2.0 supports specifying either spatial coverage, temporal coverage, or both coverages combined.Reference Interoperable Implementations
Implementations Validators
Comments from the IVOA Community during RFC/TCG review period: 2021-11-01 - 2021-12-17The comments from the TCG members during the RFC/TCG review should be included in the next section. In order to add a comment to the document, please edit this page and add your comment to the list below in the format used for the example (include your Wiki Name so that authors can contact you for further information). When the author(s) of the document have considered the comment, they will provide a response after the comment. Additional discussion about any of the comments or responses can be conducted on the WG mailing list. However, please be sure to enter your initial comments here for full consideration in any future revisions of this documentComments transcribed from a github comment from Markus Demleitner:
Comments from TCG member during the RFC/TCG Review Period: 2021-11-01 - 2021-12-17WG chairs or vice chairs must read the Document, provide comments if any (including on topics not directly linked to the Group matters) or indicate that they have no comment. IG chairs or vice chairs are also encouraged to do the same, althought their inputs are not compulsory.TCG Chair & Vice ChairApplications Working GroupData Access Layer Working GroupData Model Working GroupGrid & Web Services Working GroupRegistry Working Group | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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> > | With the standard version update to 2.0 and move to GitHub, the registry resource for the standard itself (already in RofR as ivo://ivoa.net/std/MOC) should be updated and included in the ivoa-std repository as a .vor file at the top level. This will be used to update the RofR upon REC. I can make a PR for this myself if there is a branch for it, or would be happy to review others' updates. Another registry note: section 2.5 speaks of discovery across services through MOCs. With VODataService 1.2, there is now at least spatial MOC support in registries with an eye toward expanding that to include temporal coverage. A very short note about this new search strategy would fit well here. On the whole, this is extremely well explained and illustrated, both in figures and in examples on multiple platforms. My following comments are on the level of copyediting suggestions where I found wording a little difficult, and would not block my approval of the document. 2.3 This approach permits to depict the approximate timeline ..permits us? 3. Because of current technological possibilities, to operate efficiently, we are limiting to encode any pair (order, index) on 64 bits (a long), (in fact only 62 bits since we are using one bit for distinguishing space from time in binary encoding and one bit for future usage) ...this could use a bit of reworking, no specific suggestion for better. -- TheresaDower - 2021-11-17 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Semantics Working GroupData Curation & Preservation Interest GroupEducation Interest GroupKnowledge Discovery Interest GroupOperations Interest GroupRadio Astronomy Interest GroupSolar System Interest GroupTheory Interest GroupTime Domain Interest GroupStandards and Processes CommitteeTCG Vote : 2021-11-01 - 2021-12-31If you have minor comments (typos) on the last version of the document please indicate it in the Comments column of the table and post them in the TCG comments section above with the date.
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