Closed blacha closed 3 years ago
@palmerj Said this as part of a pull request comment #55
I think we should try to use as many of the built in STAC fields as possible. e.g linz:date -> STAC item:created, Linz:camera -> STAC item:instruments. Also, rather than just packing everything into a "linz" extension, we could consider creating an Aerial Photography extension for certain field. Maybe some ideas could be taken from USGS https://lta.cr.usgs.gov/DD/nhap.html#frame. But some better searching might also be worth while.
I just found this, which looks to be a interesting way of mapping existing metadata to some stac extensions
Does look interesting. Pity ISO 19115 hasn't been done yet. But likely not too hard to do. For our LINZ metadata project that we are talking about in the S&I programme I think we really need to be considering how we are store our metadata and then map to other formats such as ISO 19115/19139
Datalake metadata extensions:
stac_extensions=["eo", "proj", "linz"]
properties = {
"created": d.isoformat("T") + "Z",
"proj:epsg": int(layer.srs.GetAuthorityCode(None)),
"eo:gsd": round(layer.resolution[0], 3),
"eo:bands": [b.to_dict() for b in bands],
"start_datetime": metadata["start_datetime"].isoformat("T", timespec="milliseconds") + "Z",
"end_datetime": metadata["end_datetime"].isoformat("T", timespec="milliseconds") + "Z",
"datetime": metadata["datetime"].isoformat("T", timespec="milliseconds") + "Z",
}
from: https://github.com/linz/linz-data-lake/blob/master/data_lake/core/metadata/stac.py
Basemap metadata extensions:
properties: {
datetime: created,
'checksum:multihash': await Hash.hash(outputTiffPath),
'proj:epsg': tms.projection.code,
'linz:gdal:version': await bm.gdalVersion,
},
Mapping Database Fields to STAC Specification: https://confluence.linz.govt.nz/display/TOP/Mapping+Database+Fields+to+STAC+Specification
LINZ Common Practice for STAC: https://confluence.linz.govt.nz/display/TOP/LINZ+Common+Practice+for+STAC#LINZCommonPracticeforSTAC-summariesmap
User Story
As a User I want to have standardised ways of using STAC metadata across LINZ's products
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