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

[Nyall Dawson]

On Fri, 16 Aug 2024, 10:15 pm Denis Rouzaud via QGIS-Developer, <
qgis-developer at lists.osgeo.org> wrote:

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


Those tickets only relate to digitising, they won't affect vector tile
rendering.

Nyall


>
> 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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