Supporting OSM Roof tags

[am2222]

I have been experimenting with using OSM roof information and I think it would be nice to add that support to extruded buildings, I put a POC plugin together which you can see its live demo here
https://github.com/am2222/maplibre-landmarks

DEMO:
https://am2222.github.io/maplibre-landmarks/

It uses osm roof tage and color tag

here is some buildings Before

And after

The plugin has some extra layers like integration to add data from OpenLandmarks (they only have like ~80) landmarks available

Or some cosmetic layers like fog, seasonal trees and rain and storm. But I think a roof integration can be a good addition for the core maplibre.

[HarelM]

I think there are some talks about this in regards to 3D visualization.
It's worth bringing this up in the next TSC meeting which will happen in a few days.
Cc: @mactrem @nyurik @CommanderStorm @louwers

If this is a fairly easy lift it might be worth considering.
I wonder how this will work for rounded corners and some more complicated mapped OSM buildings that might share parts of the roof maybe.

[am2222]

@HarelM can you point me to some examples of those buildings and I can have a look into it. Right now I use theeejs for the roofs but in general integrating it to the actual extruded layer sounds more natural to me

Also i had a hard time finding a good source of the 3d landmarks. So that might be a challenge in general.

[nyurik]

https://wiki.openstreetmap.org/wiki/Key:roof:shape

[am2222]

@nyurik I think I am covering most of the roof tops in the the osm wiki
https://am2222.github.io/maplibre-landmarks/demo/roofs-gallery.html

About the building in the wiki page

that building interestingly does not have roof tags, I made some myself and here is the results

[mactrem]

Thanks @am2222, nice work! We've just started an Immersive 3D Maps Working Group covering the same topic, so let's join forces. Please join #maplibre-3d on Slack, where I've posted how we plan to coordinate this (kickoff slides).

[am2222]

Thanks @mactrem! I requested to join the slack channel. during my tests I noticed the overture pmtiles have some optimization during making tileset that drops smaller geometries, results in some missing roof geometries

And from a local file I generated without any drop config

[am2222]

A side by side comparision with osm2world
https://am2222.github.io/maplibre-landmarks/guide/compare