Sylvain Lesage

@severo
399 Followers
262 Following
859 Posts
Dataviz developer ✧ Freelance | Open for projects
websitehttps://rednegra.net
huggingfacehttps://huggingface.co/severo
githubhttps://github.com/severo
openstreetmaphttps://www.openstreetmap.org/user/Sylvain%20Lesage
Sylvain Lesage3d ago
Observable3d ago
Too often, vague requests and messy datasets lead analysts down the wrong path. So, we put together a practical framework for moving from raw data to clearer, useful insights. Read the guide on our blog: https://observablehq.com/blog/from-raw-data-to-data-storytelling-framework-for-structuring-data-analysis
From raw data to data storytelling: A framework for structuring any analysis

In this guide, we share a practical framework for streamlining your data analysis process, helping you transform vague requests into clearer data visualizations and valuable insights.

Observable
Sylvain Lesage4d ago

If you like cartes.app as I do, take a minute to contribute to their page on Alternativeto to help others discover the app.

https://alternativeto.net/software/cartes/about/

If you don't know cartes.app, it's here:

https://cartes.app

Sylvain Lesage4d ago
Kyle Barron4d ago

Native Cloud-Optimized GeoTIFF support in Lonboard!

- Stream massive COGs on demand
- Full control over image rendering: apply colormaps, change band combinations, use ML models
- Read COGs from anywhere, including local files and private data (via Obstore)

Release post: https://developmentseed.org/lonboard/latest/blog/2026/04/02/cloud-optimized-geotiffs-in-lonboard/

Land Cover example: https://developmentseed.org/lonboard/latest/examples/raster-cog-nlcd-server/
Sentinel-2 example: https://developmentseed.org/lonboard/latest/examples/raster-cog-rgb-server/

From @developmentseed

Follow Development Seed to see other cool stuff we're working on.

Sylvain Lesage4d ago
Nicolas Lambert 🌏4d ago

RE: https://piaille.fr/@cartococo/116335456271241832

Made with @observablehq notebooks 2.0 & Geoviz JavaScript library

Sylvain Lesage4d ago
Lisa Hornung4d ago

The Tate Gallery owns more than 79,000 artworks. 🤯 About 3% of them are on display right now in the 🟣 Tate Britain, 🟠 Tate Modern and 🟢 Tate Liverpool.

You can explore the full collection in their online catalogue https://www.tate.org.uk/collection

Visualisation for the #30DayChartChallenge Day 2 - Pictogram #Dataviz

Follow the hashtag to see all the wonderful creative contributions of the community throughout April!

Sylvain Lesage4d ago
Tan G.5d ago
I missed this in December so sharing in case you did too but it’s worth revisiting even if you saw it before. #dataviz

What tiny brain monitors are t...
What tiny brain monitors are teaching us about extreme animal sleep habits

Thanks to miniaturized sleep labs, scientists are able to track the quirky ways animals snooze in risky environments.

AP News
Sylvain Lesage5d ago
Fidel Thomet5d ago

A year ago, @giacomo and I presented Vantage, a Platform for photo- and video-based spatial reconstruction for investigative journalism, which we have been working on with the support of @PrototypeFund

Today, we’re relaunching Vantage as a toolkit!

https://vantage.krisenstab.net

Show threadSylvain Lesage6d ago
@mszll @tdurand @bndktgrs thanks for the details! Next step: 3D packing 😛
Show threadSylvain Lesage6d ago
@tdurand @mszll @bndktgrs nice app, thanks for sharing. I wonder how you did to pack the forms (it's not only an arrangement of the bounding boxes, the polygons themselves are well arranged)
Show threadSylvain Lesage6d ago

And also derived works:

1. armelle caron (2005 - 2008): https://www.armellecaron.fr/works/les-villes-rangees/ - https://socks-studio.com/2011/02/01/la-ville-rangee-by-armelle-caron/

2. Jason Davis (?): https://www.jasondavies.com/maps/countries-by-area/

3. Mike Bostock (2020): https://observablehq.com/@d3/countries-by-area

4. Philippe Rivière (2023): https://observablehq.com/@fil/countries-small-multiple

5. me? (2020): https://observablehq.com/@severo/countries-by-area-of-the-svg-element - it was a joke, to get France first.

les villes rangees | Armelle Caron

impressions numériques en 3ex sur papier Hahnemülhe 310g// 80 cm x 110 cm par