Image Data Model Effort
The Image Data Model, currently under development, will describe multdimensional image and image cube datasets and instances. It will serve as the basis for the description of Image datasets in archives and VO queries, as well as the basis for Image data access protocols such as SIAV2 and related access methods such as siav2.accessData.
ImageDM-ObsCore Convergence
It was agreed in the fall 2013 interop to do whatever is necessary to bring the Image data model into convergence with
ObsCore (e.g.,
ObsTAP), in particular making data models such as
ImageDM and
SpectralDM extensions of
ObsCore, all sharing a common core data model. We are fast-tracking an updated version of both the
ImageDM and SIAV2 drafts that will make a first cut at this convergence, sufficient to support ongoing development for the Cube initiative, while further development of the working drafts goes forward. An initial analysis of what is required has been performed by a subset of the
ImageDM author group (FB, ML, MCD, DT) and the results are summarized here:
The consensus at this point appears to be that we finalize a set of Characterisation V2 Utypes, use these for both
ImageDM and
SpectralDM, and update the older
ObsCore/ObsTAP document to comply. This will take a while, but all we need for ongoing Cube development is the updated
ImageDM and SIAV2 drafts plus a summary of the revised Utypes planned for
ObsCore.
Further updates will be posted here as this effort progresses. Discussion should be carried out on the DM mailing list.
Current Drafts
Latest version of the draft:
Previous versions:
Some related documents can be found here:
In particular, there is a new draft of the
SIAV2 image access specification which is sync-ed up with the current version of the
ImageDM.
The VAO Cube whitepaper relevant use cases and analysis addressing the problem of modeling and accessing multidimensional image data in the VO:
This includes a section on the
ImageDM, mainly addressing issues pertaining to the image cube use cases.
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