How to adapt a map style from OpenFreeMaps to a PMTiles map?

[igregson]

The styles I have in mind are here:

https://github.com/hyperknot/openfreemap-styles

Specifically, I've been trying to get this one to work:

https://github.com/hyperknot/openfreemap-styles/tree/main/styles/liberty

I replaced the code here:

https://github.com/maputnik/osm-liberty/blob/gh-pages/style.json#L11-L12

With this:

"type": "vector",
"attribution": "<a href='https://github.com/protomaps/basemaps'>Protomaps</a> © <a href='https://openstreetmap.org'>OpenStreetMap</a> ",
"tiles": ["https://api.protomaps.com/tiles/v4/{z}/{x}/{y}.mvt?key={MY_API_KEY}"],
"maxzoom": 15

That kind of works...

Notice there are no labels or anything.

And then when zooming in, it gets worse:

---

Any pointers on how to move forward here? Is this even possible?

[bdon]

You need to get a .mbtiles from OpenFreeMap's public bucket https://github.com/hyperknot/openfreemap?tab=readme-ov-file#public-buckets and convert it with pmtiles convert.

[igregson]

Thanks @bdon!

I hadn't considered the approach of converting their tiles to pmtiles. Had been thinking in terms of updating their style JSON to match the spec needed by the base flavor. I suppose this approach would be much more tedious and less robust, in contrast to the tile-conversion approach.

[bdon]

Yeah, I don't recommend that porting approach because you are likely to get a completely different visual result. Best to use the style JSON with the tileset it was intended for.