Mercator ↔ Equal Earth

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.