# STAC Sprint 2025 - Reference Guide & Resources 📚

**ESA ESRIN, Frascati | October 14-16, 2025**

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**Quick Links**
- 📋 [Group Formation Doc](https://hackmd.io/@stac-sprint-2025/H1Ny2Bcpxg/edit)
- 📅 [Sprint Agenda](https://github.com/radiantearth/community-sprints/blob/main/14102025-esrin-rome-italy/agenda.md)
- 📝 [Specification Topics Detail](https://github.com/radiantearth/community-sprints/blob/main/14102025-esrin-rome-italy/prep-work/specification-topics.md)
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## 🎯 Sprint Objectives Reminder

### Primary Focus
Advance STAC + Zarr integration for cloud-native geospatial data access

### What Success Looks Like
- **Per Group:** At least 2 GitHub issues opened + 1 PR or detailed specification draft
- **Overall:** Clear action plans for post-sprint continuation
- **Community:** Strengthened collaboration between STAC and Zarr communities

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## 🛠️ Tools & Platforms

### Primary Tools

#### GitHub (Main Platform)
**Where to work:**
- **STAC Spec:** https://github.com/radiantearth/stac-spec
- **STAC Best Practices:** https://github.com/radiantearth/stac-best-practices
- **STAC Extensions:** https://github.com/stac-extensions
- **STAC API Spec:** https://github.com/radiantearth/stac-api-spec
- **Community Sprints Repo:** https://github.com/radiantearth/community-sprints

**Best Practices:**
- ✅ Open an **issue first** to discuss the problem/proposal
- ✅ Link PRs to issues using keywords: `Fixes #123`, `Relates to #456`
- ✅ Use draft PRs for work-in-progress
- ✅ Tag relevant people using `@username` for feedback
- ✅ Use labels to categorize issues (enhancement, documentation, question, etc.)
- ✅ Check existing issues before creating new ones

#### HackMD / Google Docs (Collaborative Editing)
**When to use:**
- 🔄 **Brainstorming sessions** - Quick ideation and discussion
- 📊 **Meeting notes** - Daily wrap-up summaries
- 📝 **Draft specifications** - Before formalizing in GitHub
- 💭 **Discussion threads** - When you need rapid back-and-forth

### Communication Tools

#### [Slack Channel](https://cloudnativegeo.slack.com/archives/C094EKRDY04)

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## 📚 Key Resources

### STAC Documentation
- **STAC Spec:** https://stacspec.org/
- **STAC Extensions Catalog:** https://stac-extensions.github.io/
- **STAC Best Practices:** https://github.com/radiantearth/stac-spec/tree/master/best-practices
- **STAC Tutorials:** https://stacspec.org/en/tutorials/

### Zarr Documentation
- **Zarr Spec v3:** https://zarr-specs.readthedocs.io/
- **Zarr Python Docs:** https://zarr.readthedocs.io/
- **GeoZarr Spec:** https://github.com/zarr-developers/geozarr-spec
- **Kerchunk:** https://fsspec.github.io/kerchunk/
- **VirtualiZarr:** https://github.com/zarr-developers/VirtualiZarr

### Related Standards
- **CF Conventions:** https://cfconventions.org/
- **OGC Standards:** https://www.ogc.org/standards/
- **EOPF Documentation:** https://cpm.pages.eopf.copernicus.eu/eopf-cpm/main/index.html#

### Implementation Examples
- **STAC Browser:** https://github.com/radiantearth/stac-browser
- **pystac:** https://github.com/stac-utils/pystac
- **xarray:** https://docs.xarray.dev/
- **stackstac:** https://github.com/gjoseph92/stackstac

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**Last updated:** October 14, 2025 | **Maintained by:** Sprint Organizers
**Questions?** Ask in #sprint-general or talk to Emmanuel Mathot / Matthias Mohr