Sylvain Lesage | Observable

Sylvain Lesage

Dataviz developer ✧ Freelance | Open for projects. Prototyping here with JS, d3, three.js.

https://rednegra.net

linkedin.com/in/sylvain--lesage/

https://github.com/severo

https://mastodon.social/@severo

https://huggingface.co/@severo

severo@rednegra.net

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Videos and 3D tracked swimmers

Apr 2•1 2

Sports ground texture projection

Mar 31

Nombre d'élus municipaux

Mar 18

Hello csv-range

Nov 14

Hello Papaparse

Oct 10, 2025

Bug in source.coop: Content-Range is not accessible

Oct 10, 2025

Issue while streaming CSV from source.coop

Oct 8, 2025

Use HTTP Range Request on a File/Blob

Oct 8, 2025

Hello Foursquare places

Sep 12, 2025•7

Sep 12, 2025•4

Parquet structure

Sep 10, 2025•1

'Parquet Content-Defined Chunking' blog post replication

Sep 3, 2025•1

Sep 1, 2025•1

Read partial parquet files with DuckDB WASM

Aug 12, 2025•3

Matices políticos - Bolivia 2020

Aug 4, 2025•1

Matices políticos - Bolivia 2025

Aug 4, 2025

Stream Parquet with WASM Parquet

Aug 1, 2025

Difference between two Parquet files

Jul 29, 2025

Bolivian arch Senate and Assembly

Jul 24, 2025

d3.bin edge cases

Jul 22, 2025

General classification - 2025 Dauphiné

Jun 13, 2025•1

⏲ Individual time trial - 2025 Dauphiné

Jun 12, 2025•1

Hello geoparquet library

Jan 6•1

Shifting Winds of French Politics: Mapping Right and Left Shifts in the 2024 vs.…

Jul 5, 2024•4

Hausse de l'extrême droite aux législatives (premier tour 2022 - 2024)

Jul 4, 2024•2

Hausse participation 2022/2024 aux législatives (premier tour)

Jul 3, 2024•1

Jul 2, 2024•3

Participation Législatives 2024 premier tour

Jul 1, 2024•1

Distribution gauche / droite - législatives 2024

Jul 1, 2024

Jul 1, 2024

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