Hallo,
yesterday I looked into sachsen.osm. Almost all streams and drains have layer=-1, some in addition with tunnel=yes, culvert=yes or covered=yes. That means, almost all waterways have the wrong layer.
In my local sachsen.osm, I removed the layer=-1 for all waterways without tunnel=yes, culvert=yes or covered=yes (Aprox. 2500).Then I generated a new sachsen.map (with an render-style, which includes railways=miniature). Now, all seems to be correct at least in a neighborhood of Dresden. However, I cannot remove "layer=-1" on the osm-database.
In the discussion citated avove by jusc, there is clear position to tag waterways nomally without layer or with layer=0, except they are really in the underground.
yesterday I looked into sachsen.osm. Almost all streams and drains have layer=-1, some in addition with tunnel=yes, culvert=yes or covered=yes. That means, almost all waterways have the wrong layer.
In my local sachsen.osm, I removed the layer=-1 for all waterways without tunnel=yes, culvert=yes or covered=yes (Aprox. 2500).Then I generated a new sachsen.map (with an render-style, which includes railways=miniature). Now, all seems to be correct at least in a neighborhood of Dresden. However, I cannot remove "layer=-1" on the osm-database.
In the discussion citated avove by jusc, there is clear position to tag waterways nomally without layer or with layer=0, except they are really in the underground.