Hey Orik,
If I remember correctly, it's only for gpkg, fgb or shp formats. Other
than that the docs show a 'validate' switch which is more robust than
the 'light' validation that is done.
Scott
On 7/19/25 08:44, Erik Schnetter via gdal-dev wrote:
I am using GDAL to create a multidimensional zarr file that is sozip
compressed. I see this error when creating the file:
ERROR 1: dish_positions.00000000.zarr/zarr.json already exists in ZIP file
ERROR 8: Open file /vsizip/data/fengine_init_pathfinder/
cx66_dish_positions.00000000.zarr.zip/dish_positions.00000000.zarr/
zarr.json to write failed
Everything is working fine when I do not use sozip compression. I enable
sozip compression by adding a "/vsizip" prefix to the file name.
Although there is an error reported on screen, I do not see an error
code reported by the function creating or closing the multidimensional
dataset. The resulting file ("*.zarr.zip") is created fine and looks
almost correct, but all attributes seem to be missing.
I wonder – is it actually possible to create a zarr file that is sozip
compressed, given that zarr probably writes to each of its file multiple
times? If not, what is the preferred way to create a sozip-compressed
zarr file efficiently?
Some details:
I create the dataset (i.e. the file) via
const auto driver_manager = GetGDALDriverManager();
const auto driver = driver_manager-
>GetDriverByName("Zarr");
const auto dataset =
std::unique_ptr<GDALDataset>(driver->CreateMultiDimensional(
full_path.c_str(), root_group_options_c.data(),
options_c.data()));
where "full_path" is "/vsizip/data/fengine_init_pathfinder/
cx66_dish_positions.00000000.zarr.zip/dish_positions.00000000.zarr".
I then create multiple attributes ("CreateAttribute") and then
const auto mdarray = group->CreateMDArray(meta-
>get_name(), dimensions, datatype,
array_options_c.data());
const bool success = mdarray->Write(
arrayStart.data(), count.data(), nullptr,
bufferStride.data(), datatype,
frame + datatypesize * meta->offset, frame,
buffer->frame_size);
and finish with
const CPLErr err = dataset->Close();
assert(!err);
The full code is available at <https://github.com/kotekan/kotekan/blob/
eschnett/updates-2/lib/stages/gdalFileWrite.cpp <https://github.com/
kotekan/kotekan/blob/eschnett/updates-2/lib/stages/gdalFileWrite.cpp>>.
-erik
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