# 📢 ESiWACE3 Data compression hackathon

**URL:** <https://forum.ecmwf.int/t/esiwace3-data-compression-hackathon/14846>\
**Category:** Workshops, competitions and events\
**Tags:** hackathon, file\_format\
**Created:** [7 April 2026 14:25 UTC](https://forum.ecmwf.int/t/esiwace3-data-compression-hackathon/14846 "2026-04-07T14:25:40Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Michela](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/m/898d66/32.png) [@Michela](https://forum.ecmwf.int/u/Michela)\
**Post date:** [7 April 2026 14:25 UTC](https://forum.ecmwf.int/t/esiwace3-data-compression-hackathon/14846/1 "2026-04-07T14:25:40Z")

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Event date: **15-17 September 2026**  
Location: **Bonn, Germany**  
Attendance: **Hybrid**  
Registration deadline for in-person attendance: **31-07-2026**  
Registration deadline for online attendance: **31-08-2026**

 ![hackathon_figure](https://forum.ecmwf.int/uploads/default/original/2X/6/68e263c28de2bbdd4f2951f08721bf8be384f71e.jpeg)

We are excited to announce the ESiWACE3 Data compression hackathon. It is a great opportunity to explore which compression methods and compression error requirements work best to address the urgent problem of the exponentially growing size of model data while preserving important data properties.

The event brings together leading data compression teams and leading modelling groups working at the forefront of this challenge. Participants will work hands-on in interdisciplinary teams, using provided datasets or bringing their own data to test methods, define requirements, and build practical compression strategies.

Register now and advance data compression for weather and climate models!

All details and registration are available at [ESiWACE3 Data compression hackathon (15–17 September 2026)](https://events.ecmwf.int/event/526/) on the ECMWF Events page.

For any enquiries regarding this event, please contact us via the [ECMWF Support Portal](https://climate.copernicus.eu/help-and-support).

ECMWF Support

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**Author:** ![Michela](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/m/898d66/32.png) [@Michela](https://forum.ecmwf.int/u/Michela)\
**Post date:** [16 July 2026 15:44 UTC](https://forum.ecmwf.int/t/esiwace3-data-compression-hackathon/14846/3 "2026-07-16T15:44:16Z")

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A quick reminder: registration deadline for in-person attendance is **31-07-2026**!