https://observablehq.com/@fil/d3-hexbin-tricontours-heatmap?collection=@fil/tricontours
d3-hexbin & tricontours heatmap / Fil | Observable
Sep 14, 2023 - We aggregate random points into hexagonal bins (with d3-hexbin), and draw a heatmap by running tricontours on the number of points in each bin. (Note: this...