Mapper — charts on a relief map

This is a figure composer, not an analysis. You place pie and donut charts, keys, labels and images onto a shaded-relief basemap, position them over the places they describe, and export the result as a high-resolution image or an animated MP4. It is the step between having numbers and having something a reader can follow — the same job the map figures in an ancient-DNA paper do.

Charts anchor to the map rather than to the screen, so a chart placed over a region stays over that region when the view moves or the export renders at a different size. That is what keeps the exported figure saying the same thing as the one you composed; a chart pinned to screen coordinates drifts off its location the moment the canvas dimensions change. Everything runs in your browser and your composition is saved locally, so work in progress stays on your machine.

The honest caveat about map figures: placing a pie chart on a country is a claim about where a population was, and the map makes that claim look more precise than the underlying data usually is. Ancient samples come from specific sites, not from territories, and modern labels rarely match ancient boundaries. Label what a chart represents and over what period, and prefer putting a chart near the sites the samples came from rather than at the centre of a modern country.