Finalise an updated CEOS-ARD STAC extension for the Synthetic Aperture Radar (SAR) PFS.
Update from LSI-VC-15:
﹣ The focus has been on mapping the CEOS-ARD requirements to STAC properties and extensions.
﹣ The previous STAC CARD4L Extension was complex, and covered only the SR, ST, NRB and POL PFS. There were many CARD4L fields that should live in separate STAC extensions, and the naming was also outdated.
﹣ Working with CEOS on clarifications, a single optical template, and “profiles”.
﹣ The CEOS-ARD STAC Extension has been simplified by not including all optional requirements.
﹣ “Profiles” have been created for optical and microwave.
﹣ The Extension will be extended to cater for the new PFS as well.
﹣ Draft for optical is available in the repository, pending some clarifications.
﹣ Updates may be necessary if the Optical PFS is merged.
﹣ A review by CEOS is sought, and efforts will be made to create some example datasets.
﹣ Radar is planned for 2024. The process requires a lot of discussions for new STAC extensions in approximately 30 fields. Support is needed from SAR experts to help accomplish this.
﹣ The draft extension for optical can be found at github.com/stac-extension/ceos-ard
Update from LSI-VC-16:
Matthias noted the existing/old STAC CARD4L extension. The optical mapping was quite good, however there were many SAR fields that were not covered in existing core/extensions. The recently updated new CEOS-ARD extension is quite limited, just covering the type of data and the PFS and its version. This is seen as the ideal case, where the CEOS-ARD extension would only cover aspects that are unique to CEOS-ARD, and the other parameters/requirements in the PFS would be covered by the STAC core or perhaps some other higher level extensions. Ideally we would have a specific section in the building blocks defining the mapping of the parameter to existing STAC field names. That would avoid the mapping, which currently needs to be updated by Matthias.
LSI-VC-16-08: Ake to work with Matthias to investigate the feasibility of replacing the SAR XML metadata specification with a modified STAC JSON. For the SAR PFS specifically we need to work out what is missing from the metadata on the STAC side. Those missing fields might necessitate a new STAC extension / evolution of the CEOS-ARD extension.
Forward roadmap:
Mid-term (Sept 2025, LSI-VC 18):
CEOS: Start to align building blocks / taxonomy / etc. (potentially align with STAC?)
MM: Introduce metadata mappings to STAC metadata
MM: Generate/create STAC extensions for PFS