Level of detail in z14 tiles

[SomeoneElseOSM]

I've noticed the the geometry of a a map created from vector tiles has less detail than the equivalant CartoCSS Mapnik raster one.

Obviously this is a really small feature, but it's clear that (for example) node 9834746176 isn't reflected in the outer path - it has been "simplified out" of the way that it is part of.

The config is here and that path way is in the transportation layer. I'd have expected the "simplify" stuff to have had no effect on what goes in to zoom 14 vector tiles or on how they are displayed at a zoom of 21. I don't know if this is a maplibre gl effect; here are the sources for the html file, metadata, spec and style.

Is there anything that I can do to make resulting map of the path better reflect the underlying data?

In case it helps, here's an example created from the Paul's example non-tilemaker tiles - that shows even more simplification.

[systemed]

Internally, vector tiles work on a coordinate system which is typically 4096x4096. So everything you see is snapped to an integer coordinate between 0 and 4095 at z14. When you zoom a long way in, this starts to make itself obvious.

tilemaker offers a setting to ameliorate this, which is "high_resolution": true in your global JSON settings. This will increase the resolution to 8192x8192 at the highest zoom level only (probably z14). There are a few screenshots in #384 which demonstrate using this.

Alternatively, you can of course generate tiles at z15, but I've usually found high_resolution is enough.

[SomeoneElseOSM]

Thanks - I'll give each of them a go and report back on the impact on fetched tile size etc. as well as on how it looks.

Based on what Apache said it was serving, the z14 tiles are pretty small, so quadrupling their size probably won't be an issue and high_resolution might solve everything on its own.

[SomeoneElseOSM]

Setting "high_resolution": true works:

raster

vector before

vector after

The size of the "/sve01/14/8144/5249.pbf" before was 8840, after it was 9838 (so not that much bigger). The size of the .mbtiles as a whole only increased from 1078132736 to 1082261504.