[Tilesathome] New waterway rendering

["Marc Schütz"]

> I also adjusted the widths with the following constraints:
> * At z17 the waterways are shown at the correct width of 3 / 10 meters.
> * At z12 the waterways retain the old widths of 4 / 10 svg pixels.
> * The changes between the levels are a constant multiplicative factor to
> create smooth transitions between the level.
> * The changes between the levels are small enough that the same way
> never has more pixel in the png after zooming out. Thus fixes trac
> ticket 1263

In my opinion the default widths for streams and especially drains are too large:
http://www.openstreetmap.org/?lat=49.9552&lon=10.8792&zoom=14&layers=0B00FTF

The waterway=drains north of the village Kemmern are almost as large as the river to the west, as are the streams south of Kemmern. In the tile to the east (Gundelsheim) you can still see the old rendering, which looks way better than the new one.

Moreover, the width=... tag seems to be ignored in zoom levels <= 14. I understand this is done in order not to let too small features disappear, but wouldn't it be better to use a minimum width (1 or 2 pixels) instead of ignoring it completely?

If noone objects I will reduce the default widths and introduce a minimum width for all zoom levels when I get to it.

Regards, Marc

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