Zarr Multiscales

Adding a multiscale pyramid to a Zarr store sounds mechanical — halve, repeat. In practice the failure modes are semantic (wrong resampling operator silently changes what the data means) and distributed (a partitioning bug loses shards while every job reports success). This skill covers both.

For the CRS / CF / grid_mapping side of a georeferenced store, use the geozarr skill — this one assumes that layer is handled and focuses on the pyramid.

Pick the resampling operator from the data's semantics

This is the decision that matters most, and it is not a style preference. Ask what invariant the data carries, then pick the operator that preserves it.