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Nice! Only on Hacker news can you make a comment about some kind of hypothetical programming project and have the reply be "Yes, I've made one of those already".

Do you think it's still too early to switch to vector map data for all clients then? Maybe render raster tiles on demand on the server to those clients that can't handle it?

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The barriers to adopting vector-everywhere are social and commercial, not technical.

There are a couple great public raster services like osm.org's default style and http://maps.stamen.com. These are 100% free to use, so they get used everywhere, but incur significant expense to the organizations running (paying) for them.

There aren't equivalent solutions in vector-land yet... I wrote a bit about this previously: https://protomaps.com/blog/free-tier-maps

https://maps.qwant.com uses vector tiles, altough polygon simplification at lower zoom levels could be improved.

Their stack is open sorce, described there: https://github.com/Qwant/qwantmaps#tile-server

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