WIP: ZARR: add a prototype read implementation of the geo/proj attribute conventions... [ci skip] #13215
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…ute conventions... [ci skip] ... following directions of a discussion happening at the Zarr Developer Summit 2025. It transposes https://github.com/EOPF-Explorer/data-model/tree/main/attributes/geo/proj to that attribute framework.
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should this be at the group level?
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from https://github.com/EOPF-Explorer/data-model/tree/main/attributes/geo/proj#description
Recommended usage: Store the CRS-encoding JSON object defined in this specification under the proj key in the attributes of a group that contains arrays to declare CRS metadata for those arrays. This supports the common geospatial practice of storing multiple arrays with the same coordinates in a single group. Array-level definitions are supported for override cases but are less common.
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This supports the common geospatial practice of storing multiple arrays with the same coordinates in a single group
That's something we need to discuss. My initial feeling is that I'm no a huge fan of having stuff defined only at an upper level when potentially users can point GDAL to open a inner group directly or an array. So that means either such use case will be invalid, or GDAL would need to walk up the hieararchy (but where to stop?) which involves extra I/O
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... following directions of a discussion happening at the Zarr Developer Summit 2025.
It transposes https://github.com/EOPF-Explorer/data-model/tree/main/attributes/geo/proj to that attribute framework.
Example:
{ "attributes":{ "zarr_conventions_version": "0.1.0", "zarr_conventions": { "f17cb550-5864-4468-aeb7-f3180cfb622f": { "version": "0.1", "name": "geo/proj", "description": "", "schema": "http://example.com/geo.proj.schema.json", "configuration": { "code": "EPSG:26711", "spatial_dimensions": ["Y", "X"], "transform": [60, 0, 440720, 0, 60, 3750120] } } } } }