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The "white pixel" effect on fragments' common borders, like on the tile borders of forests, is clearly visible in some of the front page layers like here: http://osm.org/go/cLhOhw8?layers=H . These horizontal/vertical light stripes were visible in all layers until some weeks ago. Just lately, these stripes have disappeared in some of them like in the standard layer. |
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Normally we would not have tile borders in OSM - our data model is not tile based. Normally we would expect that someone who imports data from another source takes care to prepare the data to match OSM standards. However, CanVec importers have often done sloppy work and favoured speed and quantity of data over quality, hence the "tiled" woods in OSM (e.g. http://www.openstreetmap.org/relation/1504239 from your example). It is possible to write your map style in a way to gloss over these problems by applying a suitable gamma value to the "Polygon Symbolizer". It is possible that changes to this gamma value are responsible for the change you say you've observed. |
