We (and by we I really mean my inimitable collaborator Philippe Rivière) have started prototyping plugins for rendering geographic shapes using D3 projections,

We (and by we I really mean my inimitable collaborator Philippe Rivière) have started prototyping plugins for rendering geographic shapes using D3 projections, so I expect Plot would be able to support this fairly soon. Then you can use something like this Scrubber component to drive the animation: https://observablehq.com/@mbostock/scrubber https://observablehq.com/@mbostock/scrubber