OME-Zarr Metadata

• OME-zarr v0.5 metadata MUST be included in zarr.json at the group and array level, with the fields described below:

Dimensions

• The axes are used as part of OME-ngff v0.5 multiscales metadata. The length of axes MUST be equal to the number of dimensions of the arrays that contain the image data.

• The dimension_names attribute MUST be included in the zarr.json of the Zarr array of a multiscale level and MUST match the names in the axes metadata.

Units

• For spatial and temporal dimensions, units from the OME-ngff v0.5 specification MUST be used.

Multiresolution

• The used downsampling method MUST be documented in the zarr.json file.

Additional Metadata

Datasets may provide additional metadata that is not captured by this standard. The original metadata MAY additionally be stored in human-readable format next to individual arrays, i.e. next to zarr.json files containing ome.multiscales metadata.