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[ARTICLE · art-122733] src=simonwillison.net ↗ pub= topic=generative-ai verified=true sentiment=· neutral

Mercator ↔ Equal Earth

Simon Willison used GPT-6 Astra (medium) in ChatGPT Work to build an animated transition between the Mercator and Equal Earth map projections using D3, after the Equal Earth projection was recently voted on at the UN. The tool is available at tools.simonwillison.net/equal-earth.

read1 min views1 publishedSep 7, 2026

Tool: Mercator ↔ Equal Earth I got curious about the Equal Earth map projection that was recently voted on at the UN so I had GPT-6 Astra (medium) in ChatGPT Work build me this animated transition between Mercator and Equal Earth using D3.

Tags: geospatial, d3, vibe-coding, gpt-6-astra

source & further reading
simonwillison.net — original article Video compressor Research acceleration: The view inside OpenAI Using Blender with coding agents on macOS
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