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This can be quite simple to implement using matplotlib hatches. You specify them as strings, like '+' and you control the density by multiplying the symbol ('+++'). See the example below:
Ooh, rad, that's very close to what I was hoping for!
I suppose the intent was to be able to make a hatch_map function, like the existing value_by_alpha map, that allowed you to vary the density of the hatching along with (or independent of) the color ramp. This would be a way to get an alternative bivariate choropleth strategy, varying hatching & hue instead of mixing two hues. With what you've shown above, that should definitely be possible by stratifying the data by hatching, then coloring the symbols...
After reading "Choropleth Maps without Class Intervals?", I wonder whether there's a way we can get cross-hatching on fill styles for maps? The new Shelton & Poorthuis preprint uses some crosshatching for visual effect, and I think it looks better in black/white settings.
I'll probably dig into this at some point, but wanted to log this for posterity/in case someone else wants to run with this.
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