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# System prepended metadata

title: Adopter Days (Friday)

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# We'll start at 9:15 AM

# Resourses
QR Code for this page:

![image](https://hackmd.io/_uploads/r14koPkAxl.png)

Sign-in page - https://hackmd.io/m43SegmcRS2sq3xw1SF-fQ
Zulip (synchronous chat) - https://ossci.zulipchat.com/
Schedule - https://zarr.dev/zarr-summit-2025/schedule/
Share your photos! - https://photos.app.goo.gl/qrcor4BZnU1JUpid9
Survey - https://forms.gle/ZBNFZvZmN8NMnfjPA

## Breakout group interest (not a commitment, can indicate multiple)

Native Zarr Features - 
## Icechunk workshop

Demo repo: https://github.com/earth-mover/zarr-summit-2025


## Choosing if Zarr is right for you

## Workshop: Virtual Zarr for archival file formats

https://github.com/developmentseed/zarr-summit-virtualizarr-workshop

- Poster on virtualizing Sentinel-1 backscatter: https://zenodo.org/records/16874900


## Breakout group: Native zarr features

- Sharding (loop bar roof)
- Data types (loop bar right side when moving towards roof)
- Migration (near food in loop bar)
- chunk grids (on left of the loop bar)


# lightning talk slides

- storing sparse arrays to zarr: https://docs.google.com/presentation/d/1SKabUwR2ZHcct06R2kgKablEdJ6y9iWsrvy9nB46fQM/edit?usp=sharing


# Birds of a feather
## 2:20 PM
STAC on the roof at 2:20 PM
ML - right in the loop bar at 2:20 PM
microscopy - hallway at 2:20 PM
visualization - by the food at 2:20 PM
earth sciences - cancelled in favor of STAC / visualization / opt. performance

## 3:30 PM

Break - loop bar
Python - front of plaza (main) room
Rust - back of plaza (main) room
Julia - hallway
Continuing optimizing performance
multiscales -- roof

## Retro on Zarr

### What went well

- community is nice, active - cross-domain nature is valuable
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- large communities and data providers are adopting zarr
- many more people are using zarr v3
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### What could have gone better

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- lots of work to do
- documentation could be improved for new users 
- zarr.dev needs a refactor, including implementations
- decouple roles within the community
    - marketing
    - decision making
    - blog wrangling
    - etc.
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- relative lack of large operational Zarr stores to pave the way - or where they exist they're difficult for newcomers to find for reference
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### What should we do more of

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