[gdal-dev] Zarr syntax question

[Even Rouault]

Michael,

This is both a usage issue, and the driver not erroring out on that 
invalid use whereas it should.

You should prefix the URL with /vsicurl/ , and if you use Bash as a 
shell, to make sure the double quotes are preserved up to GDAL, you need 
to surround the whole string with single quote characters.

So:

gdalmdiminfo 
'ZARR:"/vsicurl/https://ncsa.osn.xsede.org/Pangeo/pangeo-forge/gpcp-feedstock/gpcp.zarr 
<https://ncsa.osn.xsede.org/Pangeo/pangeo-forge/gpcp-feedstock/gpcp.zarr>"'

and similarly for gdalinfo:

gdalinfo 
'ZARR:"/vsicurl/https://ncsa.osn.xsede.org/Pangeo/pangeo-forge/gpcp-feedstock/gpcp.zarr"'

gdalinfo 
'ZARR:"/vsicurl/https://ncsa.osn.xsede.org/Pangeo/pangeo-forge/gpcp-feedstock/gpcp.zarr":/precip:0' 
(0 here for the 2D slice at time index = 0)

In https://github.com/OSGeo/gdal/pull/6330, I've improved doc and error 
messages.

Even


Le 08/09/2022 à 05:53, Michael Sumner a écrit :
> Hello, I'm trying to connect to this zarr:
>
> https://ncsa.osn.xsede.org/Pangeo/pangeo-forge/gpcp-feedstock/gpcp.zarr
>
> I can get this sort of hull description with mdim, but only "cannot 
> find group" with gdalinfo.
>
> gdalmdiminfo 
> ZARR:"https://ncsa.osn.xsede.org/Pangeo/pangeo-forge/gpcp-feedstock/gpcp.zarr"
> {
>   "type": "group",
>   "driver": "Zarr",
>   "name": "/"
> }
>
>
> gdalinfo 
> ZARR:"https://ncsa.osn.xsede.org/Pangeo/pangeo-forge/gpcp-feedstock/gpcp.zarr"
> ERROR 1: Cannot find group ncsa.osn.xsede.org <http://ncsa.osn.xsede.org>
>
> That group error makes me think there's a kind of nested dataset issue 
> to navigate?  But I can't see how zarr or gdal would expose those?  
>  There is a variable called 'precip'.
>
> I'm comparing to the python in this notebook, which works fine on the 
> same system. I'm using GDAL built from source.
>
> https://notebooksharing.space/view/c6c1f3a7d0c260724115eaa2bf78f3738b275f7f633c1558639e7bbd75b31456#displayOptions=\
>
> Cheers, Mike
>
>
> -- 
> Michael Sumner
> Software and Database Engineer
> Australian Antarctic Division
> Hobart, Australia
> e-mail: mdsumner at gmail.com
>
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