MB GL JS pixels do not correspond to QGIS and other pixels

[sfkeller]

When mapping MB GL JS to QGIS styles (#87) there seems to be a glitch regarding pixels values. If these pixel values are mapped 1:1 to QGIS pixels, the resulting graphic size in QGIS seems to be much larger.

The MB GL JS spec speaks of "Units in pixels", e.g. line-width (https://www.mapbox.com/mapbox-gl-js/style-spec/#layers-line ). Now, there is evidence that this is a special kind of pixel units....

Perhaps this could help? https://gis.stackexchange.com/questions/259407/style-line-width-proportionally-to-maintain-relative-size-in-mapbox-gl

Else I'd suggest to open an issue in https://github.com/mapbox/mapbox-gl-js/issues .

[mnboos]

This may also be helpful: https://github.com/mapbox/mapbox-gl-js/blob/3f419f30b99271cf05c269c8cd40d5c948119533/src/style-spec/expression/definitions/interpolate.js#L213

[tomchadwin]

This isn't a DPI/HiDPI issue is it?

[mnboos]

I think it's a scaling issue, resulting from my mapping "map_scale -> zoom", which seems to differ from Mapbox.

[mnboos]

Finally: