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Generative AI & Models updated 1 min read

Animated Map Shows Mercator vs Equal Earth Projections

A new interactive animated map, created by GPT-6 Astra, visually demonstrates the differences between Mercator and Equal Earth map projections. Users can slide a bar or play a button to see the transition between these two projections. The map highlights how each projection preserves different geographic properties. This tool, built using D3, provides a clear comparison of these two widely used…

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Key points

  • Animated map shows Mercator and Equal Earth projections
  • Users can transition between the two projections using a slider or play button
  • Visualizes how each projection preserves different geographic properties
Full story from Simon Willison · by Simon Willison Open source ↗

Mercator ↔ Equal Earth

Simon Willison · 7 September 2026

7th September 2026

Tool

Mercator ↔ Equal Earth — View an interactive animated map that morphs between Mercator and Equal Earth projections using a slider or play button. The visualization demonstrates how different map projections represent the world, with controls to blend between the two projection types and observe how they preserve different geographic properties.

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.

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This text was published by Simon Willison and written by Simon Willison. It is reproduced here with attribution so you can read it in full; the rights remain with the publisher. Read it at the source ↗

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GPT-6OpenAIMercatorEqual Earth

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