-
Notifications
You must be signed in to change notification settings - Fork 16
Home
GeoZarr defines conventions for storing and accessing multidimensional georeferenced grids in Zarr format. Rather than a monolithic specification, GeoZarr is a set of composable, modular Zarr conventions that can be used independently or together.
| Convention | Namespace | Purpose | Repo |
|---|---|---|---|
| geo-proj | proj: |
CRS information via EPSG codes, WKT2, or PROJJSON | zarr-conventions/geo-proj |
| spatial | spatial: |
Affine transforms between array indices and coordinates | zarr-conventions/spatial |
| multiscales | multiscales |
Pyramid structures and resolution levels | zarr-conventions/multiscales |
All conventions are registered via the zarr_conventions metadata array and identified by UUID.
The SWG approved a 3-milestone plan at the February 2026 meeting targeting OAB review by summer 2026:
- V1 Release Candidate — Conventions reach "Candidate" maturity (3+ implementations)
- V1 Architecture Board Review — Formal OGC AB presentation and public comment period
- V1 SWG Vote — Final vote for adoption as OGC Standard
Progress is tracked on the GitHub Project Board.
| Implementation | Language | geo-proj | spatial | multiscales |
|---|---|---|---|---|
| eopf data-model | Python | Full | Full | Full |
| zarr-cm | Python | Full | Full | Full |
| geozarr-examples | Python | In-progress | In-progress | In-progress |
| rioxarray | Python | In progress | In progress | — |
| GDAL | C++ | Planned | Planned | Planned |
| OpenLayers | JavaScript | Read | Read | Read |
| TiTiler | Python | Read | Read | Read |
📆 First Wednesday of each month
⌚ UTC: 3:00PM | EDT: 11:00AM | PDT: 8:00AM | CEST: 5:00PM | [more]
🔗 Join the meeting now (or by phone)
📝 Minutes
- Google Group: geozarr — updates and participation
- GitHub: zarr-developers/geozarr-spec — issues, PRs, and discussion
- Contributing: See CONTRIBUTING.md
- GeoZarr Examples: https://developmentseed.org/geozarr-examples/
- Demo videos playlist (visualization, time series, performance comparisons)
- E-AI Programme Working Group (Dec 2025)
- OGC NetCDF SWG Annual Meeting (Oct 2025)
- Zarr Summit (Oct 2025)
The following writings from the earlier phase of the project introduce the fundamental concepts and motivation that led to the current conventions-based approach: