banner
jhamman.bsky.social
Joe Hamman
@jhamman.bsky.social
580 followers 120 following 52 posts
Climate scientist, engineer and human. Co-founder/CTO @earthmoverHQ. @xarray_dev / @pangeo_data dev. Formerly @carbonplanorg, @NCAR_Science, and @uw_cee. He/him.
Posts Media Videos Starter Packs
Reposted by Joe Hamman
earthmover.io
Earthmover @earthmover.io · 15d
Meet @rabernat.bsky.social, @jhamman.bsky.social and more of the Earthmover team at our #ClimateWeekNYC events. PSA: the hands-on tech workshop Wednesday and panel on Thursday still have capacity, but are filling up fast.
1 2
jhamman.bsky.social
Joe Hamman @jhamman.bsky.social · Jul 10
Super excited to see #icechunk v1.0 ship today. Stable format, stable API, and ready for production. Take it for a spin and let us know how it goes. 🚀🚀🚀
earthmover.io
Earthmover @earthmover.io · Jul 10
Today at SciPy 2025 we released Icechunk 1.0, an open source package and specification that enables database-style transactions against petabyte-scale array datasets using only cloud object storage as infrastructure. Read about it on our blog earthmover.io/blog/icechun..., or visit earthmover.io
Icechunk 1.0: Production-Grade Cloud-Native Array Storage Is Here - Earthmover
A year ago, we made an important internal decision which set Earthmover on a new course—we decided to refactor and open source our core technology for storing array-based data in the cloud. This took ...
earthmover.io
5
jhamman.bsky.social
Joe Hamman @jhamman.bsky.social · May 7
Just back from #CNG2025, I wrote up some thoughts on the traction the @zarr.dev format is gaining in the broader geospatial industry (specifically Earth Observation). I also summarize what features and tools the user and developer communities are asking for to fully leverage Zarr. 👇👇👇
earthmover.io
Earthmover @earthmover.io · May 7
1/ Our team just got back from an inspiring week at the @cloudnativegeo.org conference in Snowbird, Utah, and one thing is clear: 𝐙𝐚𝐫𝐫 𝐚𝐝𝐨𝐩𝐭𝐢𝐨𝐧 𝐢𝐬 𝐬𝐮𝐫𝐠𝐢𝐧𝐠 𝐚𝐜𝐫𝐨𝐬𝐬 𝐠𝐞𝐨𝐬𝐩𝐚𝐭𝐢𝐚𝐥.
2 3
jhamman.bsky.social
Joe Hamman @jhamman.bsky.social · Apr 28
I'll be at the CNG conference in Snowbird next week. I wrote a short blog post about what the Earthmover team will be up to.

tldr; we'll be talking about @zarr.dev, #icechunk, @xarray.bsky.social and cloud-native data cubes.

Details in the blog post 👇
earthmover.io
Earthmover @earthmover.io · Apr 28
📣 Our team is heading to the
@cloudnativegeo.org
Conference in Snowbird, Utah. We’ll be sharing our latest open-source work on Xarray, Zarr, VirtualiZarr, Icechunk, and leading a hands-on workshop, 𝑍𝑎𝑟𝑟, 𝐼𝑐𝑒𝑐ℎ𝑢𝑛𝑘, & 𝑋𝑎𝑟𝑟𝑎𝑦 𝑓𝑜𝑟 𝐶𝑙𝑜𝑢𝑑-𝑛𝑎𝑡𝑖𝑣𝑒 𝐺𝑒𝑜𝑠𝑝𝑎𝑡𝑖𝑎𝑙 𝐷𝑎𝑡𝑎-𝑐𝑢𝑏𝑒 𝐴𝑛𝑎𝑙𝑦𝑠𝑖𝑠.

Read more: bit.ly/4lRWNAJ
1
jhamman.bsky.social
Joe Hamman @jhamman.bsky.social · Apr 24
Most people think of @zarr.dev as a "file format". With #Icechunk, we've turned Zarr into a database. @functionth.bsky.social's post shows how Icechunk can be used to solve a problem where transactional databases are often required.
earthmover.io
Earthmover @earthmover.io · Apr 23
1/ 🚨 New Blog Post Alert: "𝐿𝑒𝑎𝑟𝑛𝑖𝑛𝑔 𝐴𝑏𝑜𝑢𝑡 𝐼𝑐𝑒𝑐ℎ𝑢𝑛𝑘 𝐶𝑜𝑛𝑠𝑖𝑠𝑡𝑒𝑛𝑐𝑦 𝑤𝑖𝑡ℎ 𝑎 𝐶𝑙𝑖𝑐ℎ𝑒́𝑑 𝑏𝑢𝑡 𝐼𝑛𝑠𝑡𝑟𝑢𝑐𝑡𝑖𝑣𝑒 𝐸𝑥𝑎𝑚𝑝𝑙𝑒" 🏦🔁

👉 Read it here: earthmover.io/blog/learnin...
Learning about Icechunk consistency with a clichéd but instructive example - Earthmover
In this post we’ll show what can happen when more than one process write to the same Icechunk repository concurrently, and how Icechunk uses transactions and conflict resolution to guarantee consisten...
earthmover.io
1
Reposted by Joe Hamman
earthmover.io
Earthmover @earthmover.io · Apr 23
1/ 🚨 New Blog Post Alert: "𝐿𝑒𝑎𝑟𝑛𝑖𝑛𝑔 𝐴𝑏𝑜𝑢𝑡 𝐼𝑐𝑒𝑐ℎ𝑢𝑛𝑘 𝐶𝑜𝑛𝑠𝑖𝑠𝑡𝑒𝑛𝑐𝑦 𝑤𝑖𝑡ℎ 𝑎 𝐶𝑙𝑖𝑐ℎ𝑒́𝑑 𝑏𝑢𝑡 𝐼𝑛𝑠𝑡𝑟𝑢𝑐𝑡𝑖𝑣𝑒 𝐸𝑥𝑎𝑚𝑝𝑙𝑒" 🏦🔁

👉 Read it here: earthmover.io/blog/learnin...
Learning about Icechunk consistency with a clichéd but instructive example - Earthmover
In this post we’ll show what can happen when more than one process write to the same Icechunk repository concurrently, and how Icechunk uses transactions and conflict resolution to guarantee consisten...
earthmover.io
1 1 5
jhamman.bsky.social
Joe Hamman @jhamman.bsky.social · Apr 21
There's still time to sign up for tomorrow's webinar on ⚡Flux ⚡

👇
share.hsforms.com/1FLrE9CpwSLq...
jhamman.bsky.social
Joe Hamman @jhamman.bsky.social · Apr 21
@zarr.dev and #icechunk are amazing but they are not magic. They are part of a thoughtfully designed cloud-native data architecture. @tegnicholas.bsky.social peels back the covers on cloud-optimized scientific data formats in our latest "Fundamentals" post 👇
earthmover.io
Earthmover @earthmover.io · Apr 17
1/ 💡 Our latest blog post in the fundamentals series, written by @tegnicholas.bsky.social, demystifies cloud-optimized scientific data formats!

Read more: earthmover.io/blog/fundame...
Fundamentals: What is Cloud-Optimized Scientific Data?
What cloud-optimized data really means, and how Zarr and Icechunk enable fast access to massive scientific datasets in cloud object storage.
earthmover.io
1 2
jhamman.bsky.social
Joe Hamman @jhamman.bsky.social · Apr 21
We found similar results when we first benchmarked #icechunk. Our conclusion: doing IO with a Rust backend is much faster than Python.

👇Really exciting to see @kylebarron.dev's Obstore backend for Zarr-Python ship today.
kylebarron.dev
Kyle Barron @kylebarron.dev · Apr 21
With today's Zarr Python release, switch to the new obstore-based backend for **3x faster** reading from S3, Google Cloud Storage, and Azure than the default fsspec backend.

zarr.readthedocs.io/en/stable/us...
developmentseed.org/obstore/late...
2 11
jhamman.bsky.social
Joe Hamman @jhamman.bsky.social · Apr 16
📝 More details: earthmover.io/blog/announc...
📅 Webinar April 22: share.hsforms.com/1FLrE9CpwSLq...
💬 DMs open — happy to chat or schedule a demo.
Announcing Flux: The API Layer for Geospatial Data Delivery - Earthmover
TLDR Earthmover’s new product–Flux–adds a whole new layer to our platform. Flux allows you to serve geospatial data from Arraylake via standard API protocols–including WMS (web map service), EDR (envi...
earthmover.io
jhamman.bsky.social
Joe Hamman @jhamman.bsky.social · Apr 16
No more bespoke APIs. No glue code.
Just fast, interoperable access via tools you already use — QGIS, ArcGIS, web maps, Python, R, MATLAB, and more.
Flux is a cheat code for building data products.
1
jhamman.bsky.social
Joe Hamman @jhamman.bsky.social · Apr 16
Flux serves data directly from Icechunk via standard APIs like EDR, WMS, and OPeNDAP.
It’s stateless, scalable, and cloud-native.
From raw data to production-grade API endpoints in seconds.
1
jhamman.bsky.social
Joe Hamman @jhamman.bsky.social · Apr 16
We built Flux to solve a core pain point: turning massive geospatial datasets into usable APIs was slow, brittle, and distracting.
Flux makes it trivial for any data producer to become a data provider.
1
jhamman.bsky.social
Joe Hamman @jhamman.bsky.social · Apr 16
🚀 Big launch today: introducing Flux — a game-changing way to serve geospatial data via standard APIs in seconds. Built for scale, speed, and simplicity.
earthmover.io
Earthmover @earthmover.io · Apr 16
1/ Today we are launching Flux, a powerful new addition to the Earthmover platform. Flux is a high-performance gateway for exploring, querying, and visualizing geospatial data via standards-compliant APIs (EDR, WMS, and OPeNDAP).
1 3 5
jhamman.bsky.social
Joe Hamman @jhamman.bsky.social · Apr 9
Training AI models at scale from data stored in cloud object storage requires thinking carefully about both bandwidth and concurrency. In this post, @functionth.bsky.social get’s into the details of concurrent reads at scale, showing how #Icechunk and S3 can easily scale beyond 200k requests/second!
earthmover.io
Earthmover @earthmover.io · Apr 9
📣 Blog post alert! 𝐄𝐱𝐩𝐥𝐨𝐫𝐢𝐧𝐠 𝐈𝐜𝐞𝐜𝐡𝐮𝐧𝐤 𝐬𝐜𝐚𝐥𝐚𝐛𝐢𝐥𝐢𝐭𝐲: 𝐮𝐧𝐭𝐚𝐧𝐠𝐥𝐢𝐧𝐠 𝐒𝟑'𝐬 𝐩𝐫𝐞𝐟𝐢𝐱 𝐬𝐭𝐨𝐫𝐲. This technical post by @functionth.bsky.social dives deep into the internals of how S3 shards data, showing that distributed Icechunk can easily perform 230,000 object reads/sec and beyond. earthmover.io/blog/explori...
Exploring Icechunk scalability: untangling S3's prefix story | Earthmover
We show Icechunk can scale to extremely high concurrency levels, and explain how it achieves this in modern object stores.
earthmover.io
1
Reposted by Joe Hamman
earthmover.io
Earthmover @earthmover.io · Apr 9
📣 Blog post alert! 𝐄𝐱𝐩𝐥𝐨𝐫𝐢𝐧𝐠 𝐈𝐜𝐞𝐜𝐡𝐮𝐧𝐤 𝐬𝐜𝐚𝐥𝐚𝐛𝐢𝐥𝐢𝐭𝐲: 𝐮𝐧𝐭𝐚𝐧𝐠𝐥𝐢𝐧𝐠 𝐒𝟑'𝐬 𝐩𝐫𝐞𝐟𝐢𝐱 𝐬𝐭𝐨𝐫𝐲. This technical post by @functionth.bsky.social dives deep into the internals of how S3 shards data, showing that distributed Icechunk can easily perform 230,000 object reads/sec and beyond. earthmover.io/blog/explori...
Exploring Icechunk scalability: untangling S3's prefix story | Earthmover
We show Icechunk can scale to extremely high concurrency levels, and explain how it achieves this in modern object stores.
earthmover.io
2 4 5
jhamman.bsky.social
Joe Hamman @jhamman.bsky.social · Apr 4
We’ll look into it!
jhamman.bsky.social
Joe Hamman @jhamman.bsky.social · Apr 3
We often see folks try to convince tabular data tools to perform well with multi-dimensional array data. This post by @rabernat.bsky.social explains, from first principles, why this rarely works. Its a good one! 👇👇👇
earthmover.io
Earthmover @earthmover.io · Apr 3
⭐ We just released the first post in our Fundamentals series. This one is called 𝐓𝐞𝐧𝐬𝐨𝐫𝐬 𝐯𝐬. 𝐓𝐚𝐛𝐥𝐞𝐬 - 𝐖𝐡𝐲 𝐭𝐚𝐛𝐮𝐥𝐚𝐫 𝐭𝐨𝐨𝐥𝐬 𝐭𝐫𝐢𝐩 𝐨𝐯𝐞𝐫 𝐠𝐫𝐢𝐝𝐝𝐞𝐝 𝐝𝐚𝐭𝐚. earthmover.io/blog/tensors...
Fundamentals: Tensors vs. Tables | Earthmover
Why tabular tools trip over gridded data.
earthmover.io
1 1 3
jhamman.bsky.social
Joe Hamman @jhamman.bsky.social · Apr 2
Super exciting to see @copernicusecmwf.bsky.social starting to adopt @zarr.dev!
copernicusecmwf.bsky.social
Copernicus ECMWF @copernicusecmwf.bsky.social · Mar 20
What's behind ERA Explorer's speed? Meet the ZARR archive! 🚀 ZARR revolutionises data processing, enabling fast, efficient access to over 80 years of climate data.
Test out its speed 👉 era-explorer.climate.copernicus.eu?lat=50.86&ln...

#C3S @zarr.dev #beautifuldata
3
jhamman.bsky.social
Joe Hamman @jhamman.bsky.social · Mar 28
🚨 New blog post 🚨

In it, we show off our recent work deploying #icechunk on top of #NASA's existing archives of Earth observation data. The results: 100x speed up when extracting time series from existing datasets stored as netCDF.
earthmover.io
Earthmover @earthmover.io · Mar 28
1/ 🚀 Solving #NASA ’s cloud data dilemma: Icechunk unlocks 100x faster access to archival data formats

We're thrilled to publish results from our pilot project with NASA and @developmentseed.org to enable high-performance cloud-native access for NASA’s 100s of petabytes of Earth observation data.
4 12
jhamman.bsky.social
Joe Hamman @jhamman.bsky.social · Mar 25
This session is going to be a blast! If you are headed to CNG next month (and you should be!), consider joining us for this workshop on @xarray.bsky.social , @zarr.dev , and #icechunk. 👇👇👇
earthmover.io
Earthmover @earthmover.io · Mar 24
Register to attend our team's workshop at @cloudnativegeo.org! The workshop will teach attendees how to use the @zarr.dev data format model for cloud-native geospatial datacube analysis.
🗓️ Apr 30-May 2
📍Snowbird, Utah
🔗 Register here: 2025-ut.cloudnativegeo.org
Reposted by Joe Hamman
earthmover.io
Earthmover @earthmover.io · Mar 18
1/ As a data platform company, we get a unique view of how other companies use data. In light of the recent cuts at @noaa.gov, our CEO, @rabernat.bsky.social, reached out to our customers to get their perspective on the value of NOAA’s data and services.
1 4 10
jhamman.bsky.social
Joe Hamman @jhamman.bsky.social · Mar 5
I'll be giving a short update tomorrow on the state of Zarr-Python following the 3.0 release back in January. Swing by the Pangeo showcase to catch the latest progress.

@zarr.dev
pangeo.io
Pangeo @pangeo.io · Mar 4
Join us tomorrow, March 5 at 12 PM EST for @jhamman.bsky.social's Pangeo showcase on Zarr Python 3 and beyond! Everyone's welcome to join through the Zoom link on the announcement 🤝🌎🐍
discourse.pangeo.io/t/pangeo-sho...
Pangeo Showcase: "Zarr Python 3 and beyond" (March 05, 2025)
Title: “Zarr Python 3 and beyond” Speaker: Joe Hamman (ORCID: 0000-0001-7479-8439) When: Wednesday, March 05, 2025 at 12 PM EST Where: Launch Meeting - Zoom Abstract: After more than a year of d...
discourse.pangeo.io
6
Reposted by Joe Hamman
earthmover.io
Earthmover @earthmover.io · Feb 27
Denver folks — join us for a Geospatial Happy Hour on Wednesday, March 12th at 7 PM MST. Come enjoy drinks, tacos, discussing geospatial data, and meeting the Earthmover team. Register: lu.ma/o6r39p6j
Denver Geospatial Happy Hour · Luma
Come have a drink, grab a bite, and nerd out with the Earthmover team on geospatial data. Earthmover will provide food and drink tickets. Our event will be…
lu.ma
3 5