[QGIS-Developer] Did polygon winding order changed in QGIS or GDAL recently?

[Denis Rouzaud]

Some related tickets/PR:
https://github.com/qgis/QGIS/issues/58333
https://github.com/qgis/QGIS/pull/55306

Le ven. 16 août 2024 à 12:09, Richard Duivenvoorde via QGIS-Developer <
qgis-developer at lists.osgeo.org> a écrit :

> Recently there was a question on the user list, about the winding order of
> polygons in json export, which seemed/(was thought to have) changed in time:
>
> https://lists.osgeo.org/pipermail/qgis-user/2024-August/054721.html
>
> And now the open data vector tiles of the Netherlands, do not work anymore
> in QGIS (in dutch):
> https://geoforum.nl/t/bgt-vectortiles-in-qgis-zijn-niet-meer-compleet/9731
>
> Their conclusion is: in the standards the OGC winding order is different
> from the MVT winding order, that is why QGIS (thinking QGIS choose for
> OGC), is not rendering the MVT tiles anymore...
>
> So my question is:
>
> - anybody aware of changes of the winding order?
> - or do we do things 'better' now, breaking older functionality?
> - or are the pdok mvt tiles wrongly ordered?
>
> In the case of MVT tiles (haven't looked into the specs though), but it
> seems that the reader of the data would respect ordering differences
> between standards?
>
> If you want to checkout the pdok/dutch open data:
>
> https://api.pdok.nl/lv/bgt/ogc/v1/tiles/WebMercatorQuad/{z}/{y}/{x}?f=mvt
> CRS: EPSG:3857
> Max Zoom Level: 17
> Styling:
>
> https://api.pdok.nl/lv/bgt/ogc/v1/styles/bgt_achtergrondvisualisatie__webmercatorquad?f=mapbox
>
> In favour of QGIS, an older Esri osm dataset, is still visible/working:
>
>
> https://basemaps.arcgis.com/arcgis/rest/services/OpenStreetMap_v2/VectorTileServer
> Max Zoom Level: 19
>
> https://www.arcgis.com/sharing/rest/content/items/3e1a00aeae81496587988075fe529f71/resources/styles/root.json?f=pjson
>
> Thanks for any pointers!
>
> Regards,
>
> Richard Duivenvoorde
>
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