GeoZarr

STAC and Zarr Workshop Update (April 2025)

Goals

• 📍 Provide a status update on the GeoZarr specification
• 🧭 Provide entry-points for contributing to GeoZarr development

What is GeoZarr?

A geospatial extension for the Zarr specification, formalizing metadata expectations.

Some history

Recent activity

Christophe Noël proposes structuring GeoZarr around the Unified Abstract Data Model

(Very) recent activity

Christophe Noël structures the spec based on the Unified Data Model and Conformance Classes

Background

Unidata’s Common Data Model is an abstract data model that merges the NetCDF, OPenDAP, and HDF5 data models to create a common API for many types of scientific data.

Unified Abstract Data Model

A Unified Abstract Data Model would encapsulate traditional models from the modelling (NetCDF, CF) plus models from the earth observation (GeoTIFF, GDAL) communities

N-D functionality with E-O optimizations

Unified Abstract Data Model Implementation

The VirtualiZarr library could be an implementation of the Unified Abstract Data Model

Upcoming activity

Discussion about conformance classes April 17

Upcoming activity

Monthly GeoZarr meeting on May 7

Upcoming activity

Cloud Native Geospatial conference including a STAC + Zarr presentation by Julia Signell

Upcoming activity

EGU General Assembly including a EOPF Zarr discussion at the Pangeo session

Shameless plug

Pangeo showcase in 3 hours will include a presentation about new Zarr optimizations!

Shameless plug

Pangeo showcase in 3 hours will include a presentation about new Zarr optimizations!

Thanks! 🚀