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Forest Rendering #318

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Bibi56 opened this issue Jul 20, 2020 · 1 comment

Bibi56 commented Jul 20, 2020

Some big forest polygons are split into pieces.
We can see subpixel fake borders.
https://tile-c.openstreetmap.fr/hot/12/1449/1991.png

jeisenbe commented Jul 20, 2020

Here's a screenshot at https://www.openstreetmap.org/#map=12/4.9940/-52.7759

Compared with OpenStreetMap Carto style:

This is unfortunately a know issue of how Mapnik (the rendering application) handles adjacent polygons. It cannot be entirely fixed, but it can be made less visible by adjusting the polygon gamma for polygon fill features, e.g. polygon-gamma: 0.3; (See https://github.com/gravitystorm/openstreetmap-carto/blob/5724017f5b549ba954d9d645c0b2383dd16237d1/style/landcover.mss#L311 for example)

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