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Zarr custom Reader?
See original GitHub issuewith the release of GDAL 3.4, the Zarr driver is now available by default, which mean that rasterio/rio-tiler can now open/read Zarr files.
Why do we need a custom reader
- Zarr format can be quite different from a COG or other raster format because it’s not restricted to 2D dataset.
If the Zarr dataset contains one single array with 2 dimensions, it will be exposed as a regular GDALDataset when using the classic raster API. If the dataset contains more than one such single array, or arrays with 3 or more dimensions, the driver will list subdatasets to access each array and/or 2D slices within arrays with 3 or more dimensions.
ref: https://gdal.org/drivers/raster/zarr.html#particularities-of-the-classic-raster-api
- No Overviews
Because there is no overview (currently in dev) we cannot fetch lower resolution of the data and should restrict to one zoom level
Issue Analytics
- State:
- Created 2 years ago
- Comments:6 (5 by maintainers)
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@vincentsarago I’m giving up on hierarchical data in rasterio. See https://github.com/rasterio/rasterio/issues/1759#issuecomment-1294298813. It seems like a lot of wasted effort on redundant Python software. I know I have flip-flopped on this in the past, but now I believe that using zarr (python) or h5py is the way to go.
thanks for trying @sgillies. I commented on the issue directly.