# Community Notebook Competition - Sentinel data in Zarr

**URL:** <https://discourse.pangeo.io/t/community-notebook-competition-sentinel-data-in-zarr/5510>\
**Category:** Data\
**Tags:** zarr\
**Created:** [February 16, 2026, 9:39am UTC](https://discourse.pangeo.io/t/community-notebook-competition-sentinel-data-in-zarr/5510 "2026-02-16T09:39:54Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Sabrina](https://avatars.discourse-cdn.com/v4/letter/s/51bf81/32.png) [@Sabrina](https://discourse.pangeo.io/u/Sabrina)\
**Post date:** [February 16, 2026, 9:39am UTC](https://discourse.pangeo.io/t/community-notebook-competition-sentinel-data-in-zarr/5510/1 "2026-02-16T09:39:54Z")

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Dear PANGEO community,

ESA is planning to distribute Sentinel data in Zarr format in the future and wants to give users a chance to try it out first.

Here’s how you can participate:

**Community Notebook Competition**  
Write your own Zarr data workflow with examples from the EOPF 101 online book and data from the EOPF Zarr Sample Service, then submit it to the [community notebook competition](https://github.com/eopf-toolkit/community-notebook-competition) (deadline on 15 March 2026). Join our [Slack](https://join.slack.com/t/eopfnotebook/shared_invite/zt-3oj3483f9-ryErk_vtmN6bnlaWKA7JAQ) for extra support!

Feel free to let me know if you have any questions!

Cheers,  
Sabrina Szeto  
thriveGEO

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**Author:** ![Sabrina](https://avatars.discourse-cdn.com/v4/letter/s/51bf81/32.png) [@Sabrina](https://discourse.pangeo.io/u/Sabrina)\
**Post date:** [February 16, 2026, 9:41am UTC](https://discourse.pangeo.io/t/community-notebook-competition-sentinel-data-in-zarr/5510/2 "2026-02-16T09:41:19Z")

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EOPF 101 online book: [https://eopf-toolkit.github.io/eopf-101/](https://eopf-toolkit.github.io/eopf-101/)  
EOPF Zarr Sample Service: [STAC Browser](https://stac.browser.user.eopf.eodc.eu/?.language=en) – rolling archive of 1 year for Europe, 1 month for the world

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**Author:** ![Northflow](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.pangeo.io/northflow/32/3638_2.png) [@Northflow](https://discourse.pangeo.io/u/Northflow)\
**Post date:** [February 21, 2026, 8:15am UTC](https://discourse.pangeo.io/t/community-notebook-competition-sentinel-data-in-zarr/5510/3 "2026-02-21T08:15:10Z")

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This is great timing! We just open-sourced climval, a Python validation library with Zarr support. Planning to submit a notebook using climval against the EOPF sample data. Looking forward to it. Cheers!

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**Author:** ![Sabrina](https://avatars.discourse-cdn.com/v4/letter/s/51bf81/32.png) [@Sabrina](https://discourse.pangeo.io/u/Sabrina)\
**Post date:** [February 21, 2026, 10:27am UTC](https://discourse.pangeo.io/t/community-notebook-competition-sentinel-data-in-zarr/5510/4 "2026-02-21T10:27:26Z")

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Sounds awesome! Looking forward to seeing your submission!

We will include the winning notebooks in the EOPF 101 online book. Contributors will be listed as co-authors of a paper about EOPF 101 as well.

In addition, there are prizes to be won… including exclusive Sentinel-2 Lego sets from ESA and a pool of 10 000€ of upskilling vouchers from thriveGEO.

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**Author:** ![Northflow](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.pangeo.io/northflow/32/3638_2.png) [@Northflow](https://discourse.pangeo.io/u/Northflow)\
**Post date:** [February 21, 2026, 10:45am UTC](https://discourse.pangeo.io/t/community-notebook-competition-sentinel-data-in-zarr/5510/5 "2026-02-21T10:45:42Z")

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Gosh! Looking forward to participate, sounds great!

Thanks for that - Excellent.