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Hierarchical grid and cell ID, suggestion #7

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@ppKrauss

Hi, D3-hexgrid is a perfect data visualization solution!

Here only a suggestion to include a function or method to return cell identifiers based in fractal indexing (space-filling curve), and its base7 or base49 alphanumeric representations.

See this 2019's article about the theme and showing algorithms for "Hierarchical Hexagonal Clustering and Indexing with hexagonal grids". There are also good solutions for equal-area grid over the globe... A function for recursive covering (like this) can be defined also, over these cell-indexing systems.

If you judge it interesting we can discuss, and maybe implement something; otherwise feel free to close without reply.

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