# STAC+Zarr Community Sprint 2025 : Manifest & Roadmap **Event:** October 14-16, 2025 | ESA ESRIN, Frascati, Italy **Focus:** Advancing STAC-Zarr integration for cloud-native multidimensional geospatial data --- ## 🎯 Sprint Objectives - Strengthen collaboration between STAC and Zarr communities - Develop practical specification improvements for multidimensional data - Address EOPF and Sentinel data representation challenges - Share implementation experiences and identify ecosystem gaps --- ## 🏆 Key Achievements ### Specification Work - [Best Practices for STAC Zarr and N-Dimensional Arrays](https://github.com/radiantearth/stac-best-practices/pull/29): Draft PR to be reviewed, approved and merged soon - [Datacube proposal to replace variables with bands](https://github.com/stac-extensions/datacube/pull/32) - [STAC Best practises for EOPF Zarr](https://github.com/EOPF-Sample-Service/eopf-stac) _specific PR to be linked_ - [STAC in Zarr](https://hackmd.io/@stac-sprint-2025/HJbMQV66le) ## 💬 Open Issues and Dicussions - [STAC to handle storage implementation details and access parameters](https://github.com/radiantearth/stac-spec/discussions/1367) - [GCPs reference for datasets that have `epsg` none, but have GCPs; also as issue for `geo-proj` zarr extension](https://github.com/stac-extensions/projection/issues/24) - [Some various suggestions and issues for `eopf-stac` based on discussion](https://github.com/EOPF-Sample-Service/eopf-stac/issues) --- ## 🛣️ Roadmap & Next Steps ### Immediate Actions (November 2025) - [ ] **Make the [Best Practices for STAC Zarr and N-Dimensional Arrays](https://github.com/radiantearth/stac-best-practices/pull/29) ready for review and merge** - _Owner: @emmanuelmathot_ - [ ] **Draft PR for [Datacube proposal to replace variables with bands: PR #32](https://github.com/stac-extensions/datacube/pull/32)** - _Owner: @rhysrevans3_ - [ ] **[STAC in Zarr](https://hackmd.io/@stac-sprint-2025/HJbMQV66le) new repo in https://github.com/zarr-experimental** - _Owner: ?_ - [ ] **Capture Multiscales discussions in a PR** - _Owner: @emmanuelmathot_ - [ ] **Capture chunk information in STAC**: It could go in the Zarr STAC Extension but it might be that this is a Zarr internal concern - _Owner: @christophreimer_ ### Short-term Goals (Q4 2025 - Q1 2026) - [ ] **Pursue the discussion around [STAC to handle storage implementation details and access parameters](https://github.com/radiantearth/stac-spec/discussions/1367) in STAC Community Meetup** - _Lead: @emmanuelmathot_ - [ ] **Adopt best practices for EOPF and provide reference implementation in [eopf-stac](https://github.com/EOPF-Sample-Service/eopf-stac)** - _Lead: EOPF Sample Service project_ - [ ] **Goal 3** - _Lead: [Name/Org]_ ### Long-term Vision (2026) - [ ] **Vision item 1** - [ ] **Vision item 2** - [ ] **Vision item 3** --- ## 📚 Resources ### Specification Repositories - [STAC Specification](https://github.com/radiantearth/stac-spec) - [STAC Best Practises](https://github.com/radiantearth/stac-best-practices) - [STAC API Specification](https://github.com/radiantearth/stac-api-spec) - [STAC Extensions](https://github.com/stac-extensions) - [GeoZarr Specification](https://github.com/zarr-developers/geozarr-spec) ### Sprint Documentation - [Sprint Preparation Topics](https://github.com/radiantearth/community-sprints/blob/main/14102025-esrin-rome-italy/prep-work/specification-topics.md) - [Sprint Agenda](https://github.com/radiantearth/community-sprints/blob/main/14102025-esrin-rome-italy/agenda.md) ### Community Channels - Zarr Community: [zarr.dev/community](https://zarr.dev/community/) - [STAC Community Sprint CNG channel](https://cloudnativegeo.slack.com/archives/C094EKRDY04) --- ## 🙏 Acknowledgments ### Participants _[Put your name, org and github handle]_ Emmanuel Mathot, Development Seed, @emmanuelmathot Daniel Santillan, EOX IT Services GmbH, @santilland Petr Sevcik, EOX IT Services GmbH, @scartography Michele Claus, Eurac Research, @clausmichele Mario Winkler, DLR, @mario-winkler Lukas Bindreiter, Tilebox, @lukasbindreiter Fabrice Brito, Terradue, @fabricebrito Rhys Evans, CEDA, @rhysrevans3 Julia Signell, Element 84, @jsignell Florian Ziemen, DKRZ, @florianziemen Vincent Dumoulin, ESA, @dumvin Kameswar Rao Modali, DKRZ, @kmodali Catherine Bouzinac, CSGF, @cbouzina Brian Terry, CEOS-SEO, @brianterry-ama Christoph Reimer, EODC, @christophreimer Michelle Roby, Radiant Earth, @mirob9363 ### Sponsors & Hosts - **ESA ESRIN** - Venue host and logistics support - **Development Seed** - Social event sponsor --- ## Feedback [form](https://forms.gle/NjHRdMW2bP9eB5We9) ## 📝 Notes _Space for additional observations, insights, or community feedback from the sprint_ ---